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MV protection relay Installation assistance guide Sepam ranges

1. Guarantee grounding of the RS 485 cable shielding Use the SubD 9 pin connector shielded delivered with the ACE909 2 module Transform the earthing system to TN S locally In particular if TN C or IT systems are present Connect the module to the local Use of a transformer with grounded secondary ground according to SEI instructions Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 53 60 Schneider Ev Electric Sepam protection relay installation assistance guide LV compartment ACE949 2 or DIN rail ACE959 module BE Place an earthing terminal near the module connected to the DIN rail Connect the module to the local ground by as short a link as possible Tinned copper strap with length lt 200 mm cross section gt 6 mm or Electrical conductor with length lt 200 mm cross section gt 2 5 mm Separate the bonding connection for the other electrical conductors Warning regarding the TN C system When the electrical installation includes a TN C earthing system 50 Hz currents and odd number harmonic currents H3 H5 etc circulate continually In the cable shielding if it is earthed at both ends In the communication network s OV link if it is earthed Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 54 60 Schneider Ev Electric Sepam protection
2. Grounding of Sepam according to SEI instructions Grounding of Sepam accessories according to SEI instructions The value of impedance 21 and Z2 is very low imc i1mc i2mc with ilmc gt gt i2mc Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 16 60 Schneider Ev Electric Sepam protection relay installation assistance guide Sepam line current inputs 11 to I3 or l 1 to l 3 Sepam uses a specific core balance CT connector for line current measurement This device ensures galvanic insulation of the Sepam input circuits and adaptation of the currents measured by the MV current transformers CTs The core balance CT connector includes a highly sensitive low level current measurement core balance CT for each phase There are different core balance CT connectors according to the Sepam model Sepam model Line current measurement Characteristics of conductors on current inputs Sepam Series 20 Via CT and CCA 630 Connection to core balance CT Sepam Series 40 1 5 to 6 mm conductor with 4 mm ring lug Sepam Series 80 The dielectric strength of the different components inserted in the connection conductors intermediate terminal blocks etc must be greater than the dielectric strength of the Sepam input i e 2 kV rms Sepam 2000 Via CT and CCA 660 The electrical conductors connected to the Sepam core balance CT are run along the metallic structures of the MV cubicle and then alo
3. I EMC filter g Grounding of the EMC filter I mH To other equipment in the DC LV compartment power supply ov OV of the supply connected to the local ground LV compartment by as short a connection as possible To other equipment in the LV compartment Sepam grounded according to SEI instructions Surge suppressor varistor with a 20 mm diameter and 275 V AC voltage or Merlin Gerin PE 15 surge arrester mounted between phase and neutral EMC filter Withstand voltage 275 V AC The withstand current is 1 5 times higher than the rating of the current protection device mounted upstream of Sepam and of all the auxiliaries supplied by the protection device The attenuation of the filter in differential mode is gt 20 dB between 100 kHz and 50 MHz e g FN 2320 Schaffner Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 30 60 Schneider Electric Sepam protection relay installation assistance guide Please note In installations Sepam is more and more often integrated in complex data management systems It may be associated with a PLC dedicated to centralized installation management A large number of data are exchanged between the Sepam protection relay and a PLC logic inputs logic outputs analog data etc In this type of installation attention must also be paid to the PLC power supply It is preferable for the PLC to be supplied by an electrical distribution system that h
4. 2 Inside the LV compartment Outside the LV compartment insulated Outside the LV compartment ground referenced Configuration n 3 Outside the LV compartment Outside the LV compartment Each configuration is illustrated in the pages which follow by a simple electrical diagram Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 37 60 Schneider Ev Electric Sepam protection relay installation assistance guide Configuration n 1 The supply source insulated is placed inside the MV cubicle The digital sensor is placed inside the MV cubicle This configuration typically reflects the connection of a Sepam logic output to a Sepam logic input This configuration implies that all the logic inputs and outputs remain within the perimeter delimited by the MV cubicle LV compartment Power supply source MES114 MES114E MES114F insulated Power supply connected to the local ground LV compartment k SE 011 oH for Ea DC power supply OV provided that the polarity of the supply is not grounded elsewhere Insulated independent logic input oa AC power supply N provided that the supply source is insulated H Insulated logic inputs with common connection point Implementation of cabling between Sepam s logic output and logic input Twisted conductors Conductors flattened along the metallic s
5. CBN Common Bonding network Local Mesh IBN Example of bonding networks Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 4 60 Schneider Electric Sepam protection relay installation assistance guide Rule no 2 Cables in groups 1 2 are highly disturbing It is essential for them to be separated from cables in groups 3 4 which are reputed to be sensitive These signal groups are never conveyed in the same cable or in the same conductor E Incompatible signals Different cables amp bundles Power Digital Power Digital analog relaying relaying analog Analog connections Digital connections screens V V 1 Power connections Digital connections Relayed I O connections Analog connections gt differentiate the groups Rule no 3 Minimize the length of cables running in parallel when they convey different signal groups in particular between cables belonging to groups 1 2 and groups 3 4 Rule no 4 Increase the distance between cables conveying different signal groups in particular between cables belonging to groups 1 2 et 3 4 As a general rule a distance of 10 cm is sufficient between the cable bundles arranged flat on a plate in common mode and differential mode If there is enough space a distance of 30 cm between them is preferable WRisks of common mode cross talk if e lt 5 h Unshielded cables from Shielded cable
6. Logic input power supply source The external power source used to supply Sepam s logic inputs must comply with the Low Voltage and electromagnetic compatibility directives EC marking The power supplies developed by Schneider Electric Industries meet those requirements The dielectric strength of the supply source must be greater than or equal to the dielectric strength of Sepam s logic inputs i e 2 kV rms Sepam logic input cabling configurations First of all we recommend that you distinguish between the logic inputs used in the application and the logic inputs that are not used To further reinforce Sepam s level of immunity we recommend that you short circuit the connection terminals of the logic inputs that are not used in the application To do this an electrical conductor as short as possible is wired directly between the two terminals of the unused logic input connector To make it easier to read the diagrams in this chapter this particular point is not represented in the different diagrams on the pages which follow In each application a distinction should be made between the logic inputs that remain within the perimeter of the MV cubicle and those that leave the MV cubicle To illustrate this we will give a few cases of use of insulated independent logic inputs Configuration Logic input power supply source Digital sensor Configuration n 1 Inside the LV compartment Inside the LV compartment Configuration n
7. Mounting recommendations The CSH120 and CSH200 core balance CTs should be installed on insulated cables For voltage cables with a rated current of more than 1000 V an earthed screen must be added Group the MV cable or cables in the center of the core balance CT Hold the cable with cable ties made of a non conductive material Do not forget to insert the screen earthing cables of the 3 medium voltage cables back through the core balance CT The MV cable should be centered in the CHS120 or CSH200 core balance CT and held by non conductive ties Cabling recommendations The CSH120 or CSH200 core balance CT is connected directly to the Sepam connector Recommended cables A twisted two wire connection is recommended However shielded cable may also be used provided that it meets the following electrical conditions Sheathed cable shielded by tinned copper strap Min cable cross section 0 93 mm AWG 18 Linear resistance lt 100 mQ m Min dielectric strength 1000 V 700 Vrms The maximum resistance of the Sepam connection wiring should not be more than 4 Q The cable should not be more than 20 meters long with a maximum linear resistance of 100 mQ m Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 18 60 Schneider Ev Electric Sepam protection relay installation assistance guide Implementation of cabling between the CSH120 200 core balance CT and Sepam Twisted two
8. Schneider Electric MV protection relay Installation assistance guide Sepam ranges series 20 series 40 Series 80 Sepam 2000 Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 1 60 Schneider Electric Sepam protection relay installation assistance guide Contents Aims Of the GUNG i cts ce cass aaa aaa paa aaea da ea atest ecco an a asa a aaa cee aaa aa aaa aaaea 3 Reference documents misra asna raoin tt eee st scott aana aaea aaa A aana aaaea aaae aaa aaa iaaa 3 Part l Generic installation rules ssssnssnnennuenneennnnunnnunnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nunn nnnn nnne nnnn nnmnnn nnna 4 Classification of signals according to level of disturbance or SeNSItIVity cccceesseeeeeesteeeeeesseeeeeenes 4 Basic installation T lle Sena aaa a a sa a a aE aaas 4 Part Il MV cubicle prerequisites cccssccsseceeeeesseeeeseeeeneeeeeseaeeeseeeenseeeseneeescaesaneeeenseeeseeesaaneeenseeeeees 8 Equipotential bonding of the installation cccccceceeeeeeceeeeeeeecaeeeeaaeeeeeeeseeeeeeaaeeeeaaeeseaeeesaeeeeaeseeeeeseas 8 Equipotential bonding of metallic enclosures cceeeceeececeeeeceeeeeeeaeeeeeeeeseaeeeeaaeseeaaeseneeeseaeeeseaaeseeeeeeaas 8 Reference for support frames in the LV COMpAartMEN c ceceeeeeeeeeeeeeee eee eeeeaeeeeeeeeseeeeesaaeeeeaaeseeeeeeaas 9 Availability of an earthing terminal in the LV Compartment cccccsceeeeeeeeeeeeeeeeteeeeese
9. A2 58 60 Schneider Electric Sepam protection relay installation assistance guide Annex 2 Glossary Classification in alphabetical order Bonding mesh Area consisting of two bonding connections reduces the impedance of the equipotential bonding network Common mode also called parallel longitudinal or asymmetric mode Currents circulating in the same direction on all the conductors of a wire connection Dependability The capability of an entity to fulfill one or more required functions in given conditions The concepts of reliability maintainability availability and safety are associated with dependability Differential mode also called normal serial or symmetric mode Current circulating in phase opposition on two conductors of a wire connection Downgrading operation Unwanted deviation in the operating characteristics of a mechanism device or system compared to the expected characteristics Earth electrode NF C 15 100 Conductive part which may be incorporated in the ground or in a particular conductive medium such as concrete or coke in electrical contact with the Earth Earthing terminal IEC 60050 195 02 31 A terminal with which an equipment item or device is fitted and which is intended to be electrically connected to the earthing installation Electromagnetic Compatibility or CEM The capability of a mechanism device or system to operate in its electromagnetic environment in a satisfactory way and wi
10. Supply source insulated Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 121 oN OUA N 10 43 60 Schneider Electric Sepam protection relay installation assistance guide Sepam logic outputs O1 to O04 Ox1 to Ox4 Sepam has logic outputs All of the logic outputs are insulated The user may freely dispose of the logic outputs or they may be assigned to a predefined application e g MV circuit breaker coil control The logic outputs consist of a dry contact supplied by a potential free electromechanical relay The load controlled by a logic output requires an external power supply source DC or AC Type of Sepam logic outputs According to the Sepam model two types of logic outputs are available to the user Logic outputs dedicated to control These outputs are used mainly to send control orders to the MV breaking device Logic outputs dedicated to indication These outputs are generally used to transfer data Sepam model Logic outputs dedicated to control Logic outputs dedicated to indication Sepam Series 20 Sepam Series 40 Sepam Series 80 Sepam 2000 No distinction between logic outputs The rated current and breaking capacity of the logic outputs dedicated to control are obviously higher than those of the logic outputs dedicated to indication The service life of the electromechanical relays and the correct operation of Sepam depend on
11. compatible with the Sepam characteristics Cabling The electrical conductors connected to the Sepam supply inputs are run along the metallic structures of the MV compartment and then the LV compartment Running them along the metallic structures reduces ground loops The conductors are held in the same strand twisted if possible to avoid the creation of cabling loops Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 25 60 Schneider Electric Sepam protection relay installation assistance guide Also when the Sepam supply lines include a protective earth conductor PE the PE must be run with the active supply conductors polarity and OV for DC supply phase and neutral for AC supply Installation of the Sepam supply source The supply source may be common to several electronic equipment items in the LV compartment It can supply equipment other than Sepam protection relays electronic devices actuators etc The Sepam supply source is either integrated in the LV compartment or transferred outside the compartment a Sepam supply source integrated in the LV compartment It is preferable for the supply source to be integrated in the LV compartment Whatever the type of supply source required the LV compartment should be designed to house and facilitate the implementation of the following components An isolation transformer if the earthing system arrangement is IT or TN C only in the case of Sepam AC suppl
12. e Star type distribution of AC power supplies to the different equipment items in the LV compartment Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 27 60 Schneider Electric Sepam protection relay installation assistance guide LV power supply system LV compartment Transformation of earthing system to TN S i Transformer secondary grounded by as short a connection as possible m i Surge suppresso i Grounding of the surge suppressor I Ne Grounding of the EMC filter To other equipment in the LV compartment Sepam grounding according to SEI instructions Surge suppressor varistor with a 20 mm diameter and 275 V AC voltage or Merlin Gerin PE 15 surge arrester mounted between phase and neutral EMC filter Withstand voltage 275 V AC The withstand current is 1 5 times higher than the rating of the current protection device mounted upstream of Sepam and of all the auxiliaries supplied by the protection device The attenuation of the filter in differential mode is gt 20 dB between 100 kHz and 50 MHz e g FN 2320 Schaffner Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 28 60 Schneider Ev Electric Sepam protection relay installation assistance guide b Sepam requires DC supply voltage The Sepam electrical power supply should be as similar as possible to the diagram below General overcurrent protection Use of an isolation
13. from the MV cubicle The digital sensor or supply source is grounded or earthed LV compartment MES114 MES114E MES114F Power supply source of logic inpuit Digital sensor Implementation of cabling between the digital sensor and Sepam s logic input Twisted conductors Conductors run along the metallic structures of the MV cubicle then the installation structures cable trunking metal ducts etc Implementation of cabling between the digital sensor and Sepam s logic input The length of the connection is limited to 500 m 1000 m outgoing and incoming if the link is not a shielded twisted pair Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 41 60 Schneider Electric Sepam protection relay installation assistance guide Supply source dedicated to insulated logic inputs An insulated logic input is often used to acquire data from a non insulated remote digital sensor The use of insulated logic inputs calls for a few preliminary installation precautions We will illustrate this with the following example In the case of the diagram below the insulated independent logic inputs 111 and 114 acquire the data supplied by the digital sensors The digital sensors are remote non insulated and come from different zones of the installation The supply source is common to digital inputs 111 and 114 If there is no equipotential bonding in the event of an insulation fault in zon
14. grounding Sepam should be installed at close as possible to the LV compartment earthing terminal or to one of the metal risers of the LV compartment see diagram on the following page The bonding conductor or strap between the Sepam relay and the LV compartment is connected if possible to contact surfaces with no paint varnish or any insulating material If this is not the case due to risks of corrosion for example it is compulsory to use spring washers to penetrate the coat of paint on the LV compartment and guarantee reliable electrical contact between the bonding conductor and the LV compartment The tightening torque of the Sepam bonding conductor or strap is sufficiently high to avoid all unwanted electrical contact over time or any loosening of the connection in particular in the event of frequent vibrations A tightening torque may be recommended The Sepam bonding conductor or strap is the source of high frequency disturbance currents These currents result from the presence of various electrical transient currents in the installation Such transients may be caused by the following Electrical switchgear operation on the MV or LV network Lightning shocks Depending on the amplitude and rise time of the transients these currents may cause interference on surrounding electrical conductors by cross talk For that reason care must be taken to separate the Sepam bonding conductor or strap from all other electrical connections
15. is mounted on a symmetrical DIN rail It may also be mounted on a metallic plate using the mounting holes provided in its base Mounting recommendations The CSH30 interposing ring CT should be installed in an area of the LV compartment in which the magnetic activity is low so as not to be disturbed risk of erroneous measurements The CT should be kept away from 50 Hz supply transformers and power cables in particular risk of measurement interference by the magnetic field radiated by such components Cabling recommendations The secondary circuit of the CSH30 is connected directly to the Sepam connector Cable to be used between the CSH30 interposing ring CT and Sepam A twisted two wire connection is recommended However shielded cable may also be used provided that it meets the following electrical conditions Sheathed cable shielded by tinned copper strap Min cable cross section 0 93 mm AWG 18 max 2 5 mm Linear resistance lt 100 mQ m Minimum dielectric strength 1000 V 700 V rms for functional reasons Maximum cable length of 2 m Implementation of cabling between the CSH30 and Sepam Twisted two wire connection preferable or cable shielded by tinned braid If a shielded cable is used the cable shielding must be connected to Sepam by a link less than 2 cm long No cable grounding to be done bonding connection via Sepam Cable less than or equal to 2 m long with linear R lt 100 milliOhms m
16. made to Sepam Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 14 60 Schneider Ev Electric Sepam protection relay installation assistance guide LV compartment Sepam is installed in the LV compartment near the LV compartment earthing terminal or by default near Metal riser of the LV compartment Sepam one of the metal risers of the LV compartment Sepam is grounded according to SEI instructions The Sepam bonding connection is Separated from the other connections made to Sepam The Sepam bonding connection is supported by a surface with no paint varnish or any Insulating material If these conditions are not met spring washers must be used i nm Local ground GO L Electrical protection Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 15 60 Schneider Ev Electric Sepam protection relay installation assistance guide Connection of Sepam accessories to the local ground Many optional accessories may be used with Sepam relays They made be mounted on Sepam or remote Remote optional Sepam modules are mounted on a symmetrical or asymmetrical DIN rail The same as for Sepam grounding of the remote optional modules calls for special care and the shortest possible electrical connections must be used Sepam accessories How to connect Sepam accessories to the local ground MSA141 analog output module Pro
17. of the Sepam input i e 2 kV rms The electrical conductors connected to the Sepam voltage inputs or to the CCT640 voltage adapter terminals are run along the metallic structures of the MV cubicle and then along the LV compartment Running them along the metallic structures reduces ground loops The conductors are held in the same strand and may be twisted to avoid the creation of cabling loops Warning The CCT640 connector may be disconnected from the Sepam relay even when the MV voltage transformers VTs are energized To guarantee the safety of people the CCT640 connector must be connected to an electrical protection conductor A connection terminal is provided on the CCT640 connector for that purpose See the diagram on the following page Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 23 60 Schneider Ev Electric Sepam protection relay installation assistance guide L1 af Ss Sir Baily ests Gv s SiC rai NS Ust Implementation of cabling between the VTs and the CCT640 connector To ensure the safety of people earthing of the Conductors held in the same strand or twisted with sheathing CCT640 connector is mandatory Conductors run along the metallic structures of the MV cubicle See the MV cubicle prerequisites chapter regarding the implementation of MV voltage transformers VTs Special recommendation regarding the CCT640
18. protection relay installation assistance guide Part I Generic installation rules Classification of signals according to level of disturbance or sensitivity All electrical cables contained in installations may be associated with the groups of signals defined in the table below Group Disturbing capacity Sensitivity evel__ Erampes Power circuits in general Welding machine power supply PEN and PE electrical conductors Group 2 Control circuits including inductive loads relays contactors etc Group 3 Communication circuits Group 4 Analog measurement circuits RTDs sensors etc Basic installation rules Correct building of electrical installations entails compliance with the following basic rules Rule no 1 Guarantee an equipotential bonding network in low frequency and high frequency Throughout the site Locally where the equipment is installed All exposed metallic parts in the installation metallic structures chassis metallic plates cable trunking etc are interconnected to create an equipotential bonding network The interconnections of the different metallic parts must be reliable created by a contact with low impedance in high frequency The ohmic stability of the impedance must not deviate according to material aging or physical and chemical factors in the environment au Mesh BN BN Bonding network IBN Isolated Bonding Network Mesh BN
19. relay installation assistance guide Example of an installation including equipment communicating between two buildings Assumptions Moderately sized electrical installation Implementation of a 2 wire RS 485 communication network Be careful of the connection of the RS485 cable shielding to ACE949 2 module Grounding of the shielded cable by metallic clamps provided on the module Mechanical tightening of the clamp is sufficient to guarantee contact but not too much to damage the RS485 cable Comply with a minimum bending radius of 20 for the CCA612 cord Connect Sepam to the local ground according to SEI instructions Connect the module to the local ground according to SEI instructions If one of the following two conditions is met Equipotential bonding of the installation not guaranteed or considered insufficien Installation earthing system TN C AL Implement a backup PE cable connecting communicating equipment 16 mm2 cross section recommended Interconnection of the protective earthing terminals of building is mandatory to meet safety standards e g NF C 15100 Building 2 ay Warning Comply with the bending radius specified for the RS485 cable used according to the cable reference Building 1 To other equipment SH ACE949 2 module Distributed LV compartment MV compartment TIN FOaN DMD A goo wo iH PA Eei i
20. supply voltage Positive sequence current gt twice the maximum current consumed by the relay e Network composed of a class Y resistor and capacitor AC or DC coils Generally speaking we can consider the following criteria R E i The value of C given in uF the value of i given in A e g if i 2 A then C 2 uF If the current is not known use a 0 1 uF capacitor The capacitor s withstand voltage will be gt 1 5 times the voltage E E R Z rge chai e Varistor AC or DC coils The varistor should be sized case by case according to the following Application Voltage Energy to be dissipated Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 46 60 Schneider Ev Electric Sepam protection relay installation assistance guide MET148 2 temperature sensor RTD module The MET148 2 module may be used to connect 8 temperature sensors of the same type Pt100 Ni100 or Ni120 type sensors 3 wire sensors Example of use of the MET148 2 module with Sepam Series 20 Implementation of RTD cabling Cable shielded by a tinned strap is highly recommended Connection of cable shielding at MET 148 2 module end only link as short as possible Cable less than 1 km long between temperature sensor and MET 148 2 module wire cross section greater than or equal to 2 5 mm2 Cables run along metallic structures Comply with the bending radius of shielded cables according
21. to 30 V DC 20 20 See documentation See documentation 48 to 127 V DC 20 20 See documentation See documentation 220 to 250 V DC 20 10 See documentation See documentation Sepam supply source functions The Sepam supply source performs several functions First of all it supplies the electrical power needed for the operation of the Sepam relay It reinforces Sepam s galvanic insulation In certain applications it eliminates constraints relating to the installation s electrical distribution earthing system arrangement by setting up the TN S system Electrical characteristics of the Sepam supply source The Sepam supply must comply with the Low Voltage and electromagnetic compatibility directives EC marking The power supplies developed by Schneider Electric Industries meet those requirements The dielectric strength of the power supply must be greater than or equal to the dielectric strength of the Sepam power supply i e 2 kV rms The cabling and connection accessories inserted in the Sepam supply lines must also meet that requirement The Sepam supply source is obviously sized to be capable of supplying the current consumed by Sepam and must also be capable of supplying the inrush current at the time of the powering up of Sepam or of the number of Sepam units present For a DC power supply full wave or three phase rectifier the AC ripple voltage superimposed on the DC component of the supply voltage must be
22. to specifications of the cable used In severe environments the cable may be fitted with overshielding grounded at both ends provided there is an equipotential bonding network LV compartment MET148 2 Le i i N d 2 N 5 J 34 3 A N 4 LJsa 15 nog st 6 O Q 7 S P 9 N 7 AN 4 to 11 11s j Pte ic Grounding of the MET148 2 Sepam module according to series 20 SEI instructions MSA141 CCA77x cord module CCA77x cord DSM303 module Separate the RTD cables very sensitive cables from the CCA77x cords V Comply with a minimum bending radius of 20 mm for the CCA77x cords cables shielded by steel tape Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 47 60 Schneider Ev Electric Sepam protection relay installation assistance guide LV compartment MET 148 2 Module DIN rail ohn Install an earthing terminal near the module connected to the DIN rail Connect the module to the local ground by as short a link as possible Tinned strap with length lt 200 mm cross section gt 6 mm or Electrical conductor with length lt 200 mm cross section gt 2 5 mm Separate the module bonding connection from the other electrical conductors Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 48 60 Schneider Ev Electric
23. Cable run along metal structures Implementation of the link between the MV core balance CT and the CSH30 interposing ring CT The conductors connected to the secondary circuit of the MV core balance CT are held in the same strand in a sheath so as not to create loops The conductors are run along the metallic structures of the MV cubicle Earthing of the secondary of the MV core balance CT The secondary is earthed via a copper bar as short as possible with a rectangular cross section The main earthing terminal of the MV cubicle provides reference potential for the MV core balance CT 1A 2 passages 5 A 4 passages Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 20 60 Schneider Ev Electric Sepam protection relay installation assistance guide The conductors connected to the secondary circuit of the CSH30 interposing ring CT are held in the same strand preferably a twisted 2 wire connection The conductors connected to the secondary circuit of the CSH30 interposing ting CT are run along the metallic structures of the MV cubicle The outgoing and incoming wires passing through the primary circuit of the CSH30 interposing ring CT are held together so as not to create loops between them The outgoing and incoming conductors are run along the metallic structures of the MV cubicle The conductors of the primary and secondary
24. Sepam protection relay installation assistance guide MSA141 analog output module The MSA141 module converts Sepam measurements into analog signals Selection of the measurement to be converted by parameter setting 0 10 mA 4 20 mA or 0 20 mA analog signal according to parameter setting Scaling of the analog signal by parameter setting of the minimum and maximum values of the converted value Example of use of the MSA141 module with Sepam Series 20 Implementation of analog output cabling Shielded cable recommended Connection of shielded cable at MSA141 module end only as short a link as possible Cables rune along the metallic structures Comply with the bending radius of shielded cables according to specifications of the cable used In severe environments the cable may be fitted with overshielding grounded at both ends provided there is an equipotential bonding network LV compartment MSA141 CCA77x cord Sepam series 20 ons F CCA77x cord Grounding of the MSA141 module according to SEI instructions MET148 2 6 module pr DSM303 module Separate the analog output cable from the CCA77x cords Comply with a minimum bending radius of 20 mm for the CCA77x cords cables shielded by steel tape Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 49 60 Schne
25. U32 U13 U 21 U 32 U 13 Phase to neutral voltage inputs V1 V2 V3 V 1 V 2 V 3 Residual voltage input vo v 0 Temperature inputs T1 to Tx Analog outputs Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 12 60 Schneider Electric Sepam protection relay installation assistance guide Sepam cabling management Sepam is an electronic protection relay that has a high level of immunity particularly to electromagnetic phenomena Sepam s level of immunity may however be made even higher by control of the Sepam cabling conditions It is therefore advisable for cabling to be rigorously managed To facilitate Sepam cabling management at the time of installation it is advisable to first identify the different groups of signals see table on the previous page Each group of signals is protected by a cable sheath to ensure that all the conductors in the same connection are close to each other A layout drawing of the different types of cabling is recommended to ensure the following points Guaranteed separation of cabling that belongs to incompatible signal groups Each Group may be identified by an insulating marker of a specific color This identification makes it easier to separate the different types of cabling Refer to the Generic installation rules chapter Guaranteed separation of internal and external MV cubicle cabling Cabling outside the MV cubicle may be a source of electromagn
26. aeeesaeeseaeeeeaees 9 LV compartment protection and filtering GEVICES ccceeeceeseceeeeeeeeeeeaeeeeeeeeseaaeeeeaeeseeeeeseaeeesaeeeeeeesaas 9 MY cubicle MAINTENANCE wes caeseccccdessesechehsctccdens che cacsaueeecueedes Cedeadeccasbacs cassacddaadads SAS 46546648 666 8665666 38564168 10 MV current transformers 1A or 5A CTS eeecececceeeeeeeeseeceeeeeceaeeeeaaeeeeeeeeceaeeeeeaesseaeeseaeeesaeeesaeeseneeeeaees 11 MV voltage transformers VTS c cccccccesseeeeeeeeeceneeeeeaeeeeaeeseeeeeceaeeeeeaaeseeeeeceaeeeeaaesgeaeeseeeeeseaeeseaeeseneeseaees 11 Part Ill Specific installation rules for Sepam and its ACCESSOPICS ccesceseeeeeeeeeeeeeeenteneneeeeees 12 Type of electrical CONNECTIONS to SCPAM eeeceeeceeeeeceeeee tence eeeeaeeeeaeeseeeesaeeesaaeeseeeeesaeeesaeeeeaeeseeeeeaas 12 Sepam Cabling management cceeccececeeeeeeeeeeeeceeeeceaeeeeaeeceeaeeecaaeedeaeeseaeeeceaeeeeaaeseeeeeseeeesiaeeeeeeseaees 13 Connection of Sepam and its accessories to the local QrOUN cceeeeeeceeeeeeeeeeeeeseeeeeeeaeeeeeeeeaes 14 Connection of Sepam to the local ground ceccceceeeceeeneeceeeeeseaeeeeaeeseeeeeceaeeeseaeeseceeeseaeeesaeeseaeessaees 14 Connection of Sepam accessories to the local QrOUNG cccecceeeeeeceeeeeceteeeeeaeeeeaeeseeaeeetaeeeeeeeeaes 16 Sepam line current inputs 11 to 13 or l 1 to I S eee eee ee enee cece tees eeeeaeeeeeeeeeeaeeeeeaeeeneeeseaeeesaeeseneeeeaees 17 Sepam residual curr
27. as a TN S earthing system arrangement Care must be taken regarding the distribution of the power supplies of the logic and analog inputs outputs and large cabling loops of various power supplies must be avoided Be careful as well not to short circuit the galvanic insulation Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 31 60 Schneider Electric Sepam protection relay installation assistance guide LV compartment supply by a DC power system The DC supply source may or may not be insulated a The DC supply source is insulated DC supply source The OV and polarity of the supply source are insulated DC supply source polarity I I DE supply system LV compartment x mH PERRE Surge ay Grounding of the surge suppressor oe EMC filter le Grounding of the EMC filter I I H To other equipment in the LV compartment Sepam Sepam grounded Pa according to SEI instructions Surge suppressor Merlin Gerin PE 15 surge arrester mounted between the polarity and the ground common mode Merlin Gerin PE 15 surge arrester mounted between the OV and the ground common mode Merlin Gerin PE 15 surge arrester mounted between the polarity and the OV differential mode EMC filter Withstand voltage greater than the outside supply voltage The withstand current is 1 5 times higher than the rating of the current protection
28. as been validated The network is polarized by connecting the L wire to the OV and the L wire to the 5V by means of two 470 polarization resistors Rp Network polarization should only be done in one location to avoid unwanted transmission For 4 wire RS 485 communication networks it is necessary to polarize both lines transmitting and receiving Please note The dielectric strength of the different components inserted in the connection conductors intermediate terminal blocks etc must be greater than the dielectric strength of the Sepam accessories i e 1 kV rms Examples of installation In the pages which follow we give as examples recommendations for the implementation of Sepam in different types of installations including communicating equipment Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 52 60 Schneider Ev Electric Sepam protection relay installation assistance guide Example of an installation including equipment communicating in the same building Assumptions Moderately sized electrical installation Implementation of a 2 wire RS 485 communication network the 12 V DC or 24 V DC distributed supply is provided by the ACE 909 2 converter Remote monitoring and control of the installation Building 1 Other equipment Separate the signal groups Make sure to separate the RS485 cable from the supply lines and logic inputs outputs Be careful of the conn
29. circuits of the CSH30 interposing ring CT are separated to avoid the coupling of disturbances between the two current circuits Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 21 60 Schneider Electric Sepam protection relay installation assistance guide ACE990 interface The ACE990 is used as a measurement interface between a MV core balance CT with a ratio of 1 n with 50 lt n lt 1500 and Sepam s residual current input Cabling recommendations Only one core balance CT may be connected to the ACE990 interface The secondary circuit of the MV core balance CT is connected to 2 of the 5 input terminals of the ACE990 interface The core balance CT must be connected to the interface in the right direction in order for it to work correctly in particular the S1 mark on the MV core balance CT must be connected to the terminal with the lowest index Ix Cables to be used e Cable between the MV core balance CT and the ACE990 interface Maximum cable length 50 m Minimum dielectric strength 1000 V rms Maximum wiring resistance according to the rated power of the MV core balance CT Maximum conductor cross section 2 5 mm ACE990 interface s connection capacity e Cable between the ACE 990 interface and Sepam A twisted two wire connection is recommended However shielded cable may also be used provided that it meets the following electrical conditions Sheathed cable shielded by tinned copper
30. connector It is advisable to connect each of the phase voltage measurement VT secondary circuits to Sepam by a two wire link in order to make the Sepam voltage input cabling symmetrical This precaution avoids the conversion of common mode currents into disturbing differential mode voltages detected at the Sepam input Cabling of VT secondary circuits A two wire link may be used to make the Sepam voltage input cabling symmetrical Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 24 60 Schneider Ev Electric Sepam protection relay installation assistance guide Sepam power supply source Sepam needs an external power supply source to operate except for self powered models which are not discussed in this document Depending on the Sepam model a DC or AC supply source is required Sepam model Supply voltage Tolerance Ripple Sepam inrush current Sepam Series 20 24 to 250 V DC 20 10 See documentation See documentation 110 to 240 V AC 20 10 See documentation Sepam Series 40 24 to 250 V DC 20 10 See documentation See documentation 110 to 240 V AC 20 10 See documentation Sepam Series 80 24 to 250 V DC 20 10 See documentation See documentation Sepam 2000 S26 24 to 30 V DC 20 20 See documentation See documentation 48 to 127 V DC 20 20 See documentation See documentation 220 to 250 V DC 20 10 See documentation See documentation Sepam 2000 S36 24
31. correct use of the logic outputs The surfaces of the logic output relay contacts need to be cleaned The circulation of a minimal current in the contacts is recommended to destroy the oxides that may form on the surface of the contacts Special case of Sepam 2000 In the case of the Sepam 2000 protection relay there is no distinction between the logic outputs dedicated to control and those dedicated to indication The different logic outputs must be managed carefully A Sepam 2000 logic output initially dedicated to the control of a power load should not be reused to control a low consumption load e g a Sepam relay logic input However the opposite is tolerated The switching of a several Amp current destroys the thin layer of gold deposited on the electromechanical relay contacts When the deposit is destroyed the initial low ohmic resistance of the relay contact is no longer guaranteed and this may result in uncertain electrical contact Cabling The conductors are held in the same strand twisted if possible to avoid the creation of cabling loops Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 44 60 Schneider Ev Electric Sepam protection relay installation assistance guide The electrical conductors connected to Sepam s logic outputs are run along the metallic structures of the MV compartment and then the LV compartment Running them along the metallic structures reduces ground loops Sepam model Charac
32. d to perform one or more specific tasks Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 60 60
33. device mounted upstream of Sepam and of all the auxiliaries supplied by the protection device The attenuation of the filter in differential mode is gt 20 dB between 100 kHz and 50 MHz e g FN 2320 Schaffner Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 32 60 Schneider Electric Sepam protection relay installation assistance guide Note regarding the use of insulation fault detectors The use of an insulated DC power supply system is often characteristic of a need for continuity of service The monitoring of the insulated system calls for the use of an insulation fault detector The use of an insulation fault monitor for DC supply systems may cause operating problems in some cases Certain insulation fault detectors do not detect faults that are symmetrical between and with respect to the earth Wheatstone bridge insulation fault detectors with a middle point ICE DTB 210 for example in the event of an insulation fault or faulty pick up setting a few mA can modify the impedance of the electronic circuits supplied with the earthed OV Insulation fault detectors that operate by the injection of an extra low frequency signal a few Hz between a polarity and earth may in the event of insulation faults inject into the system a voltage that can be superimposed on the installation s DC voltage This can activate the security systems that monitor under or overvoltage for example When installing such
34. device or system to operate without downgraded quality in the presence of electromagnetic interference Installation EMC context Combination of devices components and systems assembled and or mounted in a given zone Level of a quantity Value of a quantity evaluated in a specified way Level of immunity Maximum level of electromagnetic interference of a given type that can have an effect on a mechanism device or system in a specified way without downgrading operation Local earth NF C 15 100 Part of the Earth in electrical contact with an earth electrode the electrical potential of which is not necessarily equal to zero PE protective conductor NF C 15 100 Conductor specified in certain protection measures against electric shocks and designed to be connected electrically to some of the following parts Grounds Conductive elements Main earthing terminal Earth electrode Supply point connected to the earth or to an artificial neutral point Protective earthing IEC 60050 195 01 1 1 Action of earthing one or more points in a system installation or device for safety purposes Susceptibility electromagnetic The incapability of a mechanism device or system to operate without downgrading in the presence of electromagnetic interference N B Susceptibility may be interpreted as a lack of immunity System EMC context Combination of devices making up a unique functional unit designed to be installed and use
35. devices it is advisable to check in the presence of an insulation fault that the Sepam relays do not show any operating problems Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 33 60 Schneider Electric Sepam protection relay installation assistance guide b The DC supply source is not insulated According to the country in which Sepam is installed the OV or polarity of the supply may be connected to the earth or local ground item G1 The DC supply source is not insulated DC supply source DC supply source DC supply source ov polarity OV polarity i 61 G1 I I DC supply system LV compartment x rt basis 3 Surge suppressor Grounding of the surge suppressor I I amp ls ass a ess smsic osna on men I I EMC filter Grounding of the EMC filter I I rt o To other equipment in the LV compartment Sepam Sepam grounded according to SEI instructions To avoid any circulation of current make sure that the DC supply source is only grounded at one point Surge suppressor Merlin Gerin PE 15 surge arrester mounted between the polarity and the OV differential mode EMC filter Withstand voltage greater than the outside supply voltage The withstand current is 1 5 times higher than the rating of the current protection device mounted upstream of Sepam and of all the auxiliaries supplied by the protection device The attenuation o
36. disturbing cabling The power supply reference should only be earthed unless it is necessary at one point to avoid any circulation of uncontrolled current common impedance source of EMC problems If these conditions are not met the length of the line must be limited to a value less than or equal to 500 m When the running of the connection is not controlled separation distance from disturbing cables a shielded twisted pair must be used In such cases the connection shielding must be connected to the exposed conductive parts at both ends This means that the earthing and bonding connections of the shield must be equipotentially bonded same earthing system This situation is not foreseeable if the Sepam and installation earthing systems are of the TN C or TN C S type In such cases 50 Hz currents and high harmonic currents may circulate on the connection shielding and make it vulnerable or even destroy the cable in the event of phase to earth fault Similarly with the IT earthing system this may cause overvoltage problems In such cases surge suppressors should be provided to maintain a level that is compatible with the connection withstand withstand of the cable associated connectors and Sepam I Os Should it be impossible to master all of these parameters only a galvanically insulated connection galvanic insulation fiber optic can ensure correct operation Copyright Schneider Electric Industries SAS 2005 51312779F0
37. e G1 or G2 there may be a potential difference between local ground G1 and local ground G2 This can cause the circulation of disturbing current which flows back to the supply source common to the logic inputs According to the impedance of the wire connections used this current is then converted into differential mode voltage detected by the logic input This may result in logic input operating problems Supply source insulated and common to logic inputs Digital sensor Sox G1 N Digital sensor A potential difference G2 Caisson BT MES114 MES114E MES114F zal zal 012 7777 GO To avoid this unwanted situation the installation precautions mentioned below should be considered In order for an insulated logic input to remain totally insulated from Sepam s other logic inputs it is necessary to power this input by a dedicated supply source The use of a supply source that is insulated but common to several logic inputs downgrades the initial insulation of the logic inputs between each other The diagram indicated on the next page may be used to eliminate that risk Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 42 60 Schneider Ev Electric Sepam protection relay installation assistance guide Digital sensor LV compartment Supply source insulated MES114 MES114E MES114F Digital sensor
38. e a year for example It consists of check that different metallic components of the cubicle are interconnected and tightened and that there is no corrosion in particular in the presence of humidity or chemical factors favorable to oxidation The maintenance operation is also an opportunity to check the tightening of the electrical conductors connected to the different equipment items in both the MV and LV compartments It is especially advisable in environments with major mechanical vibration constraints e g monitoring and control of a high power asynchronous motor located near the MV cubicle During the maintenance operation any surge arresters present in the electrical installation particularly any located in the LV compartment should be checked This operation may be limited to a visual inspection of the surge arrester operating indicator for example Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 10 60 Schneider Ev Electric Sepam protection relay installation assistance guide MV current transformers 1A or 5A CTs To avoid differences in the measurements taken by the different MV current transformers in particular in the presence of transient electrical phenomena each current transformer should be earthed in the same way The secondary circuits of the MV current transformers connected to the cubicle s main earthing terminal by means of a copper bar as short as possible with a rectangular cross sectio
39. e that the power supply is only earthed at one point to avoid any circulation of current Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 39 60 Schneider Ev Electric Sepam protection relay installation assistance guide Case 2 2 the digital sensor is grounded or earthed LV compartment MES114 MES114E MES114F Do not connect the supply source to the local ground LV compartment DC supply 0V AC supply N Power supply source insulated Implementation of cabling between the digital sensor and Sepam s logic input Twisted conductors Conductors run along the metallic structures of the MV cubicle then the installation structures cable trunking metal ducts etc Implementation of cabling between the digital sensor and Sepam s logic input The length of the connection is limited to 500 m 1000 m outgoing and incoming if the link is not a shielded twisted pair Not connecting the supply source OV or N to the local ground avoids the circulation of disturbing currents in the electrical conductors of the logic input This current is liable to affect the logic input s operation Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 40 60 Schneider Ev Electric Sepam protection relay installation assistance guide Configuration n 3 The supply source insulated is placed outside the MV cubicle The digital sensor is remote
40. ection of the RS485 cable shielding to the ACE949 2 module Grounding of shielded cable by metallic clamps provided on the module Mechanical tightening of the clamp is sufficient to guarantee contact but not too much to damage the RS485 cable Tn Roan war gowo Comply with the bending radius specified for the RS485 cable used according to the cable reference Comply with a minimum bending radius of 20 mm for the CCA612 cord Connect Sepam to the local ground according to SEI instructions MV cubicle ACE949 2 module L OID Ac SO BOW AM TOA NOSSO OS UAN 1 GOD TONDIND OF TOS CXD To ar goo OS Connect the module to the local ground according to SEI instructions LV compartment MV compartment If one of the following two conditions is met Equipotential bonding of the installation not guaranteed or considered insufficient Installation TN C earthing system arrangement Implement a backup PE cable to connect communicating equipment 16 mm2 cross section recommended Implementation of the RS232 cable Minimize the length of the RS232 cable max length 10m Make sure to separate this cable from incompatible signal groups Use the reducing means available metal cable trunking etc Other equipment ACE909 2 module A RS 2 F 485 sb Master H i ntral com r 230 Vac istri i central compute L i ZH Distibuted N supply PE
41. eeeeaeeeeaes 35 Sepam s logic inputs 11 to Ix or IX1 tO XX oo cece cee e eect eeeeee eee ee ceaeeeeeeeesaeeeceaeseeaaeseeeeeseaeeeseaaeseneeeeaes 36 Types of Sepami logic INPUTS ai2ucctecse coveaz ccc sieniniai kaai aaae aa aaa aiaa 36 Eie lale E E E E A E E E TE E ET 37 Logic input power SUpply SOUICE c cececeeeeeeeeceeeeeeeeeeeaeeeeeeee cae eeeeaaeseeeeecaeeeeaaesdeaeeseeeeeaaeeeeeeseeeee 37 Sepam logic input cabling CONFIQUrATIONS ceeceeceteceeneeceeeeeeeaeeeeaaeceeeeeeaaeeeeaaeseeeeesaeeesaaeeneneeeeaees 37 Supply source dedicated to insulated logic iNPUtS ccecececeeeeeeeeeceeeeeeeeeeeeaaeeeeeeeseeeesaeeeeaeeeeees 42 Sepam logic outputs O1 to 04 OX1 tO OX4 ooo cece eeeneeeeee eee ee ae eeeeee eee eeeeaeeeeaaeseneeesaeeesaeeseneeetaes 44 Type Of Sepam logic OUtPUtS 0 22 eeeeeeeeeeeeeeceeeeeeeaeeeeeeeeceaeeeeaaeeseaeeseeeeecaaeeesaaesseeeeseeeessaaeeeeaeeeeeeeeeas 44 CANN acest othe we ee ecg es E Hae bccn ne cice ey daigh L een nnd snr SD E ie 44 Inductive load overvoltage limitiation devices eecceeececeeeeeeeeeeeeeee cee eecaaeeeeaeeseeeeeseaaeeeeaeeeeeeeeeeee 46 MET148 2 temperature sensor RTD module cecececeeeceeeee cence eeeeaeeeeaeeeeeeeseaeseeaaeseeeeeesaeeesaeeeenees 47 MSA141 analog output module cc eee cece e cence teat eeeeee cee ee caaeeeeeaeeseaeeeceaeeecaaeedeaeesceeesaeeesaeeeeneessaees 49 RS 485 COMMUNICATION network cceececeseeececeeseeceeeesneeeeeece
42. eeeesseeeeeesseeeeeesseeeeeeesseneaeesseesaeesseesaeessnnaees 51 Main Communication ACCESSONICS ccccceceeeceeneeceeeeeeaeeeeeeeecaeeeeaaeedeaeeseeeeseaeeseeaeeseaeeesaeeseeeeeeeee 51 Line end impedance matching and polarization reSiStors cccccceeeeeseeceeeeeeeeeeeeeeeeeeeeeseaeeesaeeneeees 52 EXAMples Of installatio Msi casas cesedessoccaven cepsanes Cana Eaa a aa oN aE EREE 52 Annex 1 Logical connections for Logic discrimination ccecccesece estes eeeeeeeeeeeeeeeeeeseeeeneeeeeees 57 Ahhnex 2 GOSS ANY rice oes ais aaan daaa a aaraa aN eaaa a A ead a aaa So eee 59 Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 2 60 Schneider Electric Sepam protection relay installation assistance guide Aims of the guide The aim of this guide is to indicate the appropriate installation rules for the Sepam range of protection relays These installation rules contribute to guaranteeing the correct operation and performance levels of Sepam relays in Medium Voltage cubicles This guide does not take anything away from the Sepam technical documents It is aimed at providing further explanations and additional information on the installation rules that already exist for Sepam in particular regarding electromagnetic phenomena The guide is intended for everyone in charge of installing Sepam range protection relays OEMs project managers and customer technical support The contents of the guide may be used in the i
43. ent input 10 Or l 0 2 eeeeeeeeceeeeeeeeeeeeeeceaeeeseaeeecaeeseaeeeseaeeeeaaeseneeeeseaeeseaaeseaeeseaees 18 CSH120 or CSH200 core balance CTS ccccccceeceeeeeeeesceeeeeeeceaeeeseaaeseeeeeceaeeesaaeeseaeeseeeeeesaeeeeeeesaes 18 CSH30 interposing ring CT ou cecececeeceeseeeeeececeeeeeaaeeeeaeesaeeecaaeeeeaaesaaeesaeeecaaeesqeneeseaeeeeaesseaeeseneeesaees 20 ACE990 interface inini aeii doa det hee ee deste raaa eA ead ada 22 Sepam voltage inputs U21 U32 U13 VO V1 V2 V3 oe eccececessseceeessneeeeeseneeeeeseaeeeessseeeeseeseeeenees 23 Sepam power SUPPlY SOUCE mmwmvwwvvwmvwwvvwvvwvvwvvwwwvvvwwvvuvvuwvvwvwvvevvvuvvvvvvvvv 25 Sepam supply source FUNCTIONS cceeeeeeeeeeeeeee cent Nessa said naiaiae arana aaa a ARAA dde gail s Sa i said aga i i ha as 25 Electrical characteristics of the Sepam supply SOULCE ceeeececeeeeeeeeeeeeeeeeeeeeaeeeeneeeeeaeeetaeeneneeeea 25 CANNING E A E E N Meee sid dabsached vat eadate Oeeveddteu nites deesnde At eweanaxt atetldays 25 Installation of the Sepam supply SOUICE 0 0 eeeececeee cece eceeeeeeaaaeeeeeeeteaeeeeaaeeeeaeeseeeeeeeaeeetaesteeeeseaee 26 LV compartment supply by an AC power System c ccceeceeceeeeeeeaeeeeaeeceeeeesaaeeeeeeeseaeeesaeessaaeeeeees 27 LV compartment supply by a DC power system cceeceeeeeeeceeeeeeaeeeeeeeceeeeesaaeeseaaeseeeeeesaeeesaaeeeenees 32 Sepam power supply and logic input output power Supply cceeeeeeseeeeeeeeeeeaeeeeaeeseeeeessae
44. epends on grounding Whenever grounding is essential for correct Sepam operation the term functional earth is frequently found Connection of Sepam to the local ground calls for a few basic precautions Generally speaking the impedance of the Sepam bonding connection should be as low as possible Therefore the bonding connection should always be as short as possible The connection of Sepam to the local ground differs according to the Sepam model Sepam model How to connect Sepam to the local ground Sepam Series 20 By an electrical conductor connected from terminal 17 of Sepam to the LV compartment Conductor with length lt 200 mm and cross section 2 5 mm Sepam Series 40 By an electrical conductor connected from terminal 17 of Sepam to the LV compartment Conductor with length lt 200 mm and cross section 2 5 mm Sepam Series 80 By a strap connected from the Sepam functional earth terminal to the LV compartment Tinned copper strap with length lt 300 mm and cross section gt 9 mm Sepam 2000 By an electrical conductor or strap connected from the Sepam grounding terminal to the LV compartment Conductor or tin coated copper strap fitted by a no 4 mm ring lug with length lt 200 mm and cross section 6 mm For Sepam 2000 the use of relay mounting clamps does not guarantee controlled grounding of Sepam In general the mounting clamps are fixed to the compartment door at points that are painted To facilitate
45. escribed below e ACE949 2 2 wire RS 485 network interface The ACE949 2 interface performs two functions Electrical interface between Sepam and a 2 wire RS 485 physical layer communication network Main network cable branching box for the connection of a Sepam unit with a CCA612 cord The ACE949 2 interface may be used for parameter setting of the line end impedance matching resistance of the 2 wire RS 485 network e ACE959 4 wire RS 485 network interface The ACE949 interface performs two functions Electrical interface between Sepam and a 4 wire RS 485 physical layer communication network Main network cable branching box for the connection of a Sepam unit with the CCA612 cord The ACE949 interface may be used for parameter setting of the line end impedance matching resistors of the 4 wire RS 485 network e ACE937 fiber optic interface The ACE937 interface is used to connect Sepam to a fiber optic communication star system This remote module is connected to the Sepam base unit by a CCA612 cord e ACE 909 2 RS 232 RS 485 converter The ACE 909 2 converter is used to connect a master central computer equipped with a V24 RS 232 type serial port as a standard feature to stations connected to a 2 wire RS 485 network The ACE 909 2 converter also provides a 12 V DC or 24 V DC supply for the distributed power supply of the Sepam ACE 949 2 or ACE 959 interfaces The converter offers the possibility of setting the parameters of the 2
46. etic interference in the installation caused by electromagnetic interference given off by a variable speed drive located in the vicinity for example Such electromagnetic interference may then spread throughout the MV cubicle This interference must not be conveyed along internal cabling in particular cabling connected to Sepam Simplified management of subsequent cabling changes while maintaining the separation required for the different types of cabling mentioned above The identification proposed previously substantially simplifies future work to be done on the Sepam cabling or on equipment that contains a Sepam relay It should also be specified again that no cabling should be run in front of the front panel of Sepam since this is liable to interfere with its operation risk of Sepam being disturbed by the electromagnetic field emitted by the cabling This recommendation which may appear self evident is not always followed in electrical installations Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 13 60 Schneider Ev Electric Sepam protection relay installation assistance guide Connection of Sepam and its accessories to the local ground Connection of Sepam to the local ground Grounding of the Sepam protection relay is essential since it contributes substantially to correct operation In fact in order for Sepam s electrical characteristics particularly the level of immunity to electromagnetic phenomena d
47. f the filter in differential mode is gt 20 dB between 100 kHz and 50 MHz e g FN 2320 Schaffner The EMC filter includes a differential mode cell only common mode is excluded Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 34 60 Schneider Electric Sepam protection relay installation assistance guide Sepam power supply and logic input output power supply The Sepam power supply source and the power supply source dedicated to the logic inputs outputs must not be common for the following reasons Not to disturb the Sepam power supply lines The logic input output conductors leaving the MV cubicle may be the source of electromagnetic interference This interference which spread in the MV cubicle must not affect the Sepam power supply lines and the cabling inside the cubicle in general To preserve the galvanic insulation of the power supply source dedicated to the logic inputs outputs Not to create undesirable cabling loops which are often difficult to detect The block diagram below shows the separation made between the power supply source dedicated to Sepam and the power supply source assigned to the logic inputs outputs LV supply system LV compartment ransformation of earthing system into TN S Sepam DC power supply Power supply grounded by as short a Transformer secondary connection as possible Logic input outputs DC power supply fo
48. hing of VT secondary circuits Each VT is earthed in the same way by a copper bar with a rectangular cross section The main earthing terminal of the MV cubicle Is the reference potential for the VTs Sepam inputs Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 11 60 Schneider Ev Electric Sepam protection relay installation assistance guide Part Ill Specific installation rules for Sepam and its accessories Type of electrical connections to Sepam All of the Sepam range Medium Voltage protection relays Series 20 Series 40 Series 80 and Sepam 2000 operate with similar electrical connections Each of the electrical connections made to Sepam may be related to one of the following signal groups Group 1 supply lines Group 2 logic input and output circuits Group 3 communication circuits Group 4 analog input and output circuits The table below indicates the different signal groups used by Sepam relays Type of link to Sepam Abbreviations Related signal family Sepam AC supply Group 1 Sepam DC supply Supply lines Logic inputs 11 to Ix Group 2 Ix1 to Ixx Logic input and output circuits Logic outputs O1 to Ox Ox1 to Oxx Modbus link Group 3 Inter module link Communication circuits PC link on front of Sepam Phase current inputs 11 12 13 Group 4 l 1 1 2 l 3 Analog input and output circuits Residual current input 10 l O Phase to phase voltage inputs U21
49. ich were assumed here to be perfect In addition the following factors must be taken into account When there is a change of status the signal propagation time depends on the length of the line Long lines are highly capacitive For point the propagation time for a 5000 m line is 33 us propagation time of 6 6 ns m That means that the reading of the change of status must take place with a longer time Generally speaking a factor greater than or equal to 3 is used or a time greater than or equal to 100 us For point the linear capacitance of the line with respect to the earth increases with length The average value is in the range of 10 to 50 pF m depending on the line running method The capacitance for a 5000 m line in the range of 50 to 250 nF This stray capacitance may become loaded with more or less high voltage according to various factors such as coupling with other cables and the frequency bandwidth of coupled interference The lower the supply voltage on the contacts the more operating problems are caused Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 57 60 Schneider Electric Sepam protection relay installation assistance guide For those reasons and to minimize operating problems the following points are to be taken into account The outgoing and incoming connections should be twisted pairs to minimize the differential mode loop surface The connection should be run away from all
50. ider Ev Electric Sepam protection relay installation assistance guide LV compartment MSA141 module DIN rail ohn Place an earthing terminal near the module conneccted to the DIN rail Connect the module to the local ground by as short a link as possible Tinned copper strap with length lt 200 mm cross section gt 6 mm or Electrical conductor with length lt 200 mm cross section gt 2 5 mm Separate the module bonding connection from the other electrical conductors Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 50 60 Schneider Electric Sepam protection relay installation assistance guide RS 485 communication network The Sepam range of protection relays includes the communication option This means that the relays can be connected to any RS 485 2 wire or 4 wire communication network and exchange the data necessary for centralized management of the electrical installation by a remote monitoring and control system using the Modbus master slave protocol To limit cabling errors the cause of most of the problems encountered in the implementation of communication networks and to limit network sensitivity to environmental disturbances a group of accessories is available to make it simple to connect Sepam to an RS 485 network Main communication accessories The main RS 485 network accessories that can be associated with Sepam are d
51. ies SAS 2005 51312779F0 A2 6 60 Schneider Electric Sepam protection relay installation assistance guide Rule no 8 Any free conductors in cables reserved for future use are grounded at both ends This rule is applicable in most cases but it is not advisable in the particular case of cables that include low level analog signals sensitive to 50 Hz risk of humming Rule no 9 Make sure that cables belonging to different signal groups cross at right angles in particular cables that belong to the signal groups 1 2 and 3 4 Cable bundles belonging to different groups must cross at right angles to avoid coupling by cross talk Have incomptable YES cables cross at right angles Disturbing Sensitive Disturbin g Sensitive cable cable cable cable Separate incompatible cables Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 7 60 Schneider Electric Sepam protection relay installation assistance guide Part Il MV cubicle prerequisites Equipotential bonding of the installation The equipotential bonding of electrical installations fulfills the following objectives Guarantee the safety of people and equipment The different metallic components of the installation are interconnected and connected to the protective earth Limit the appearance of potential differences between exposed metallic parts of installations A potential difference between exposed metallic parts especially in high f
52. ignals measured by the Sepam MV voltage transformers VTs The connection of the voltage inputs differs according to the Sepam model Sepam model Voltage measurement Characteristics of conductors on voltage inputs Sepam Series 20 Via VT and CCT 640 Connection to CCT 640 connector 1 conductor per terminal 0 2 to 2 5 mm max The dielectric strength of the different components inserted in the connection conductors intermediate terminal blocks etc must be greater than the dielectric strength of the Sepam input i e 2 kV rms Sepam Series 40 Measurement supplied by VT Connection to Sepam 1 conductor per terminal 0 2 to 2 5 mm max The dielectric strength of the different components inserted in the connection conductors intermediate terminal blocks etc must be greater than the dielectric strength of the Sepam input i e 2 kV rms Sepam Series 80 Via VT and or CCT 640 Connection to CCT 640 connector 1 conductor per terminal 0 2 to 2 5 mm max The dielectric strength of the different components inserted in the connection conductors intermediate terminal blocks etc must be greater than the dielectric strength of the Sepam input i e 2 kV rms Sepam 2000 Measurement supplied by VT Connection to Sepam 1 conductor per terminal 2 5 mm max The dielectric strength of the different components inserted in the connection conductors intermediate terminal blocks etc must be greater than the dielectric strength
53. l fiber or wireless data transmission Types of Sepam logic inputs Sepam provides the user with two types of logic inputs Logic inputs insulated from the ground with a common connection point Logic inputs insulated from the ground and independent The selection and correct use of the digital inputs are important to guarantee Correct operation of Sepam and more broadly of the installation Availability of logical data e Insulated logic inputs with a common connection point These logic inputs are insulated from the ground but are not insulated in relation to each other common point They must be used to acquire logical data from the following digital sensors Insulated sensors Sensors that are not insulated but come from the same zone of an installation with an equipotential bonding network Sensors that preferably come from the same equipment e g a motor The different logic data are contained in the same cable e Insulated independent logic inputs These logic inputs are also insulated from the ground but they are also insulated from each other They must be used to acquire data from the following digital sensors Non insulated sensors earthed Remote sensors Sensors from several zones in the installation that does not have an equipotential bonding network Sensors from different equipment items To guarantee the insulation of each logic input it is essential for each logic data item to be contai
54. mplementation of Sepam in new electrical installations or when retrofit operations are carried out in existing installations The guide mainly deals with the implementation of Sepam relays in Medium Voltage cubicles The installation rules mentioned are independent of the type of Medium Voltage cubicle The implementation of Sepam in another type of switchgear assembly may involve particular installation rules The guide concisely addresses the different key points of installation with the intent of focusing on practical use Numerous illustrations taken from Sepam user manuals are included for that purpose The guide mainly concerns the following ranges of Sepam protection relays The guide is organized in three separate parts Part Generic installation rules Part Il MV cubicle prerequisites Part Ill Specific installation rules for Sepam and its accessories All installation rules that are not stipulated in the Sepam user manuals or in this guide are to be prohibited Reference documents Reference Title of document PCRED301005EN2 Sepam Series 20 User manual PCRED301006EN 3 Sepam Series 40 User manual SEPED303005EN 2 Sepam Series 80 Catalogue 3140750F F Sepam 2000 S25 S26 and S35 S36 Installation use commissioning general characteristics DBTP542en Schneider Technical guide 2000 Modbus network Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 3 60 Schneider Ev Electric Sepam
55. n The two electrical conductors connected to the MV current transformer CT secondary circuits are run along the metallic structures of the cubicle and then along the LV compartment Running them along the metallic structures reduces ground loops The conductors are held in the same strand and may be twisted to avoid the creation of cabling loops Earthing on CT secondary circuits Each CT is earthed in the same way by a copper bar with a rectangular cross section L L2 jidi L3 Sepam current inputs The main earthing terminal of the MV cubicle Is the reference potential for the CTs MV voltage transformers VTs To avoid differences in the measurements taken by the different MV voltage transformers VTs in particular in the presence of transient electrical phenomena each voltage transformer should be earthed in the same way The secondary circuits of the MV voltage transformers are connected to the cubicle s main earthing terminal by means of a copper bar as short as possible with a rectangular cross section The electrical conductors connected to the MV voltage transformer secondary circuits are run first along the metallic structures of the cubicle and then along those of the LV compartment The holding of the conductors by the metallic structures reduces ground loops The conductors are held in the same strand and may be twisted to avoid the creation of cabling loops H Eart
56. nd guarantee reliable electrical contact MV cubicles should be equipped with a main earthing terminal comprising a bare copper bar with a rectangular cross section The main earthing terminal is used to connect the installation s protective earth PE protection cable It is generally used as the potential reference for the MV current transformers CTs or MV voltage transformers VTs The LV compartment consists of a metallic receptacle generally located above or beside the MV compartment The purpose of the physical separation between the MV and LV compartments is to partition the LV compartment This separation is essential to minimize the propagation of disturbances caused by MV switchgear operations toward the LV compartment Such disturbances are mainly high frequency radiated electromagnetic interference Equipontential bonding serves a true purpose in the LV compartment Equipotential bonding is also guaranteed between the MV and LV compartment enclosures Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 8 60 Schneider Electric Sepam protection relay installation assistance guide The doors of the MV and LV compartments contribute to reducing electromagnetic interference in the compartments cubicle shielded attenuation The presence of door hinges is not sufficient to guarantee equipotential bonding of the door and the compartment The hinges are generally insufficient to guarantee the safety of people in the eve
57. ned in an independent cable Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 36 60 Schneider Ev Electric Sepam protection relay installation assistance guide Cabling The electrical conductors connected to Sepam s logic inputs are run along the metallic structures of the MV cubicle and then the LV compartment Running them against the metallic structures reduces ground loops The conductors are held in the same strand and if possible twisted to avoid the creation of cabling loops When the environment and installation conditions are highly unfavorable for Sepam a shielded twisted pair is used In such cases the cable shielding is connected to the local ground at both ends provided that the installation has an equipotential bonding network Sepam model Characteristics of logic input conductors Sepam Series 20 Sepam Series 40 Sepam Series 80 Twisted two wire link 1 conductor per terminal 0 2 to 2 5 mm max The dielectric strength of the different components inserted in the connection conductors intermediate terminal blocks etc must be greater than the dielectric strength of the Sepam input i e 2 kV rms Twisted two wire link 1 conductor per terminal 2 5 mm max The dielectric strength of the different components inserted in the connection conductors intermediate terminal blocks etc must be greater than the dielectric strength of the Sepam input i e 2 kV rms Sepam 2000
58. ng the LV compartment The holding of the conductors by the metallic structures reduces ground loops The conductors are held in the same cable bundle and may be twisted to avoid the creation of cabling loops The primary circuits are connected via the strap supplied with the core balance CT connector CCA630 or CCA660 No additional earthing must be done to the core balance CT CCA630 or CCA660 Li L2 L3 iii CCA630 Sepam current inputs Implementation of cabling between CTs and core balance CT connector Conductors contained in the same toron in a sheath Conductors run along the metallic structures of MV cubicle Example of connection with CCA630 core balance CT connector See the MV cubicle prerequisites chapter regarding the implementation of MV current transformers CTs Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 17 60 Schneider Ev Electric Sepam protection relay installation assistance guide Sepam residual current input I0 or I 0 Sepam uses different techniques to determine the residual current in the installation Use of CSH120 or CSH200 core balance CTs Use of CSH30 interposing ring CT Use of ACE990 interface CSH120 or CSH200 core balance CTs The only difference between the CSH120 and CSH200 core balance CTs is their inner diameters 120 mm and 200 mm With their low voltage insulation they may only be used on cables
59. nt of insulating faults occurring on equipment housed in one of the compartments The doors of MV and LV compartments should be connected to the metallic structure at two points preferably at the top and bottom of the door Two tinned copper straps or two electrical conductors that are as short as possible should be used to interconnect the door and the compartment for that purpose Since the compartment doors contribute to the EMC performance of the compartments it goes without saying that the doors should be kept closed during operating phases Openings and vents in the metallic door of the LV compartment should be avoided when possible or else be limited to the bare minimum A metallic compartment designed to house the MV power cables may also be added to the MV cubicle The concept of equipotential bonding applies to this cable compartment as well Reference for support frames in the LV compartment LV compartments are generally equipped with DIN rails or metallic grids designed to support Sepam accessories or optional modules In order to achieve optimal equipotential bonding electrical continuity must be controlled between the DIN rails or metallic grids and the LV compartment In the particular case of DIN rails at least one sure contact point must be provided at each end of the DIN rail Availability of an earthing terminal in the LV compartment The LV compartment may also be equipped with an earthing terminal Sure electrical co
60. ntinuity is required between the earthing terminal and the compartment s metal enclosure and the electrical resistance must be less than or equal to 10 mQ at all points The main purpose of having an earthing terminal in the LV compartment in particular close to Sepam is that it may be used as an effective reference for the cable shielding Analog signal cables connected to the MV core balance CT Communication network cables etc When there is an earthing terminal the following operations may be carried out Connect the shielded cables to ground as of the point at which they enter the LV compartment Connect the shielded cables to ground by a circular 360 contact using a conductive metallic clamp LV compartment protection and filtering devices It should be possible to include protection and filtering devices in the LV compartment in particular on the electronic equipment supply lines The use of such devices may be necessary in highly disturbed electromagnetic environments Protection and filtering devices include the following components Isolation transformer Surge arrester EMC filter Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 9 60 Schneider Electric Sepam protection relay installation assistance guide MV cubicle maintenance Minimum maintenance of the MV cubicle is recommended to check the equipotential bonding The maintenance operation may be limited to a visual inspection onc
61. protection and an electromagnetic interference filter are recommended in the LV compartment These components should be included as of the point at which the supply conductors enter the LV compartment see paragraph above for more information Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 26 60 Schneider Ev Electric Sepam protection relay installation assistance guide LV compartment supply by an AC power system Sepam requires AC supply voltage or DC supply voltage a Sepam requires AC supply voltage The Sepam electrical power supply should be as similar as possible to the diagram below e General overcurrent protection e Use of an isolation transformer if the TN S or TT earthing system arrangement is not guaranteed in the installation This transformer calls for a TN S earthing system arrangement transformer secondary reference by as short a connection as possible The isolation transformer is aimed at Completely eliminating the constraints of the installation s earthing system arrangement Isolating the Sepam supply lines from any disturbing devices that may be connected to the LV power system e g motors Eliminating the impact of any modifications on the installation s electrical distribution system e Use of a surge suppressor and an EMC filter if necessary These components are particularly recommended when Sepam is implemented in environments with high levels of electromagnetic interference
62. r logic I Os ic inputs outputs Separation of Sepam power supply and the power supply dedicated to Sepam s logic inputs outputs Sepam grounded according to SEI instructions Logic inputs outputs Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 35 60 Schneider Electric Sepam protection relay installation assistance guide Sepam s logic inputs I1 to Ix or Ix1 to Ixx Sepam has multiple logic type acquisition inputs All of the logic inputs are insulated The user may freely dispose of the logic inputs or they may be assigned to a predefined application e g motor protection application The logic inputs are potential free and require an external power supply to operate DC or AC supply source The current consumed by the digital inputs is relatively low about 4 mA 10 mA for old generations of Sepam 2000 logic inputs The Sepam logic inputs are designed to operate over large distances Given their very low electricity consumption and Sepam s high EMC immunity in theory the inputs can operate with conductors up to 5 km long 10 km outgoing and incoming To reach such operating performance levels it is however necessary to use shielded twisted pairs on Sepam s logic inputs If it is not possible to use shielded twisted pairs we recommend the following Limit the length of the electrical conductors connected to Sepam s digital inputs to 500 m i e 1000 m back and forth Use optica
63. requency has an adverse effect on the operation of electronic equipment Benefit from the effects of natural shielding provided by metallic structures Many metallic structures are available in installations They accompany the installation s electrical cables and their role is to limit the area of common mode loops The use of the installation s metal structures does not entail any additional cost Equipotential bonding of metallic enclosures We will focus in this chapter on the equipotential bonding of metallic enclosures The Medium Voltage cubicles designed to include Sepam protection relays generally comprise two separate compartments the Medium Voltage MV compartment and the Low Voltage LV compartment The MV compartment houses the actual Medium Voltage switching device generally a circuit breaker or contactor and the associated Medium Voltage components CT current transformers VT voltage transformers etc The LV compartment contains all of the Low Voltage components including Sepam and its accessories Medium Voltage cubicles consist of a metallic enclosure which should have high well controlled overall equipotential bonding Electrical contact between the different metallic panels should be if possible via contact surfaces that have no paint varnish or any insulating material on them If this is not the case the use of spring washers is strongly recommended to penetrate the coat of paint on the MV compartment a
64. s from different groups different groups The use of shielded cables allows cables belonging to different signal groups to cohabit Rule no 5 Minimize ground loop areas A ground loop results from the area between an active conductor and the ground Ground loops are often used unintentionally lack of mastery of cabling in particular When the loop is subjected to an Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 5 60 Schneider Electric Sepam protection relay installation assistance guide electromagnetic field it is the source of induced disturbing voltages that can affect the operation of electronic equipment Rule no 6 In the same electrical connection outgoing and incoming conductors are always run together There should not be any loops between active conductors contained in the same connection Twisted pair connections are used to guarantee the proximity of outgoing and incoming conductors all along the connection NO Loop area Electronic too big digital I O board Electronic digital I O board Power supply Power supply Outgoing and incoming wires must always remain adjacent Rule no 7 Shielded cables are grounded at both ends provided in all cases that the installation has an equipotential bonding network All connection of cable shielding to the local ground by electrical conductors commonly referred to as pigtail connection i
65. s to be banned Shielded cables are connected to the local ground by circular contact with the shielding 360 Jumpers or metallic clamps suited to the shielded cable diameter are used The tightening of the clamps should guarantee reliable contact between cable shielding and the local ground bonding strap or cable screen However the cables should not be tightened so much as to damage them risk of crushing conductors and creating insulation faults Warning If the shielded cable connects equipment items located in the same equipotential bonding zone the shielding must be grounded at both ends If the shielded cable connects equipment items not located in the same equipotential bonding zone strong current may go through the cable shielding if there is an insulation fault in the installation The shielding potential reaches a level that is dangerous for people working on the installation In addition the current conveyed in the shielding is liable to damage the cable In these conditions the shielded cable is grounded at both ends but it is essential to add an earthing conductor in parallel The cross section of the Parallel Earthing Conductor called PEC is sized according to the potential short circuit current in that part of the installation To eliminate this potential risk an alternative solution may be to use an optical fiber link instead of a shielded cable or to use a galvanic insulator Copyright Schneider Electric Industr
66. strap with maximum length of 2 m Cable cross section between 0 93 mm AWG 18 and 2 5 mm AWG13 Linear resistance less than 100 mQ m Minimum dielectric strength 1000 V rms Implementation of cabling between the MV core balance CT and the ACE990 interface Conductors held in the same strand or twisted with sheathing Conductors less than or equal to 50 m long Conductors run along the metallic structures Implementation of cabling between the ACE990 interface and Sepam Twisted two wire link preferable or cable shielded by tinned braid If a shielded cable is used the cable shielding must be connected to Sepam by a link less than 2 cm long No cable grounding to be done bonding connection via Sepam Cable less than or equal to 2 m long Cable run along metallic structures ACE990 The downstream connection of the ACE990 interface is separated from the upstream connection to avoid the coupling of electromagnetic disturbances between the two links Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 22 60 Schneider Ev Electric Sepam protection relay installation assistance guide Sepam voltage inputs U21 U32 U13 VO V1 V2 V3 Sepam acquires voltage measurements via the MV voltage transformers VTs or via the specific CCT640 connector The CCT 640 connector contains 4 transformers It ensures the galvanic insulation of the Sepam input circuits and adaptation of the s
67. supply H LV compartment MV compartment an Whenever installations are not equipotential or extended and include IT or TN C earthing systems it is strongly recommended to use an optical link Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 55 60 Schneider Ev Electric Sepam protection relay installation assistance guide Example of an installation including equipment communicating between two buildings Assumptions Electrical installation with little equipotential bonding extended and including IT or TN C earthing systems Implementation of an optical link communication network Silica 820 nm with no exposed metallic parts Guarantee the absence of all exposed metallic parts on the optical fibers Comply with a minimum bending radius of 20 mm for the CCA612 cord Comply with the bending radius specified for the optical fibers used according to the optical fiber reference Building 1 MY cubicle ACE937 module Sepam series 20 CCA612 cord 8 ia E I L Connect Sepam to the local ground i according to SEI instructions i mP k e F 5 8 Set hed a 858 ks perg f8 44 PBDE g 0 0 eibh Sa Other equipment i b 4 h Building 2 Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 56 60 Schneider Electric Sepam protection relay installation assis
68. tance guide Annex 1 Logical connections for Logic discrimination The logical connections used for logic discrimination comprise indication relay outputs 03 O4 O12 013 and O14 contacts and logic inputs Sepam relay or MES 114 module The parameters to be taken into account to define the sizing of the connection are as follows Minimum operating voltage Maximum operating current Maximum trip threshold voltage Minimum cable cross section Maximum connection length In some cases electromagnetic interference may affect the connection Precautions are to be taken to minimize such effects Calculation of the maximum theoretical length of the connection Maximum connection resistance minimum operating voltage maximum trip threshold voltage maximum operating current With Minimum operating voltage 24 VDC 20 19 2 V Maximum trip threshold voltage 14 V Maximum operating current 3 mA i e maximum connection resistance 1 73 KQ Maximum connection length maximum connection resistance resistance per meter for the minimum cross section of the connection wire used With Minimum cross section of connection wire 0 2 mm Resistance per meter for the minimum cross section of the connection wire used 86 4 mQ m i e maximum connection length 10 000 m outgoing and incoming These theoretical results are not realistic since it necessary to take into account environment and installation conditions wh
69. teristics of logic output conductors Sepam Series 20 Twisted two wire link Sepam Series 40 1 conductor per terminal 0 2 to 2 5 mm max according to current consumed by the load Sepam Series 80 The dielectric strength of the different components inserted in the connection conductors intermediate terminal blocks etc must be greater than the dielectric strength of the Sepam input i e 2 kV rms Sepam 2000 Twisted two wire link 1 conductor per terminal 2 5 mm max according to current consumed by the load The dielectric strength of the different components inserted in the connection conductors intermediate terminal blocks etc must be greater than the dielectric strength of the Sepam input i e 2 kV rms Example of cabling configuration The supply source is placed inside the MV cubicle The load supplied and controlled from a Sepam logic output is remote from the MV cubicle LV compartment Supply Do not connect the supply source to the source local grourid LV compartment DC supply 0V insulated AC supply N I MES114 MES114E MES114F H35 2 lt 6 pea 7 oad T 24H98 111 25H79 4 n2 z2 lt H 10 zons as ee Implementation of cabling on the digital output Twisted conductors Conductors run along the metallic structures of the MV cubicle By not grounding the supply source OV or N data availabili
70. thout producing itself any electromagnetic interference that is intolerable for everything found in that environment Electromagnetic environment Group of existing electromagnetic phenomena in a given location Electromagnetic interference Electromagnetic phenomenon liable to create operating problems in a mechanism device or system or to have a detrimental effect on living or inert matter Equipotential bonding NF C 15 100 Electrical bonding which puts exposed conductive parts and conductive elements at the same potential or similar potentials Equipotential bonding connection Equipotential bonding of two grounds Equipotential bonding terminal IEC 60050 195 02 32 A terminal with which an equipment item or device is fitted and which is intended to be electrically connected to the equipotential bonding network Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 59 60 Schneider Electric Sepam protection relay installation assistance guide Failure Ceasing of an entity s capability to perform a required function Functional earthing conductor IEC 60050 195 02 15 Earthing conductor used for functional earthing Ground NF C 15 100 Conductive part of equipment liable to be touched and which is not energized but may become energized when the main insulation is faulty Ground loop area Area consisting of an active conductor and a ground Immunity to interference The capability of a mechanism
71. transformer if the TN S or TT earthing system arrangement is not guaranteed in the installation This transformer calls for a TN S earthing system arrangement transformer secondary grounded by as short a connection as possible The isolation transformer is aimed at Completely eliminating the constraints of the installation s earthing system arrangement Isolating the Sepam supply lines from any disturbing devices that may be connected to the LV power system e g motors Eliminating the impact of any modifications on the installation s electrical distribution system Use of a surge suppressor and an EMC filter if necessary These components are particularly recommended when Sepam is implemented in environments with high levels of electromagnetic interference Star type distribution of AC power supplies to the different equipment items in the LV compartment Grounding of the OV of Sepam s DC power supply by as short a connection as possible Star type distribution of DC power supplies to the different equipment items in the LV compartment Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 29 60 Schneider Ev Electric Sepam protection relay installation assistance guide LV power supply system LV compartment x m Transformation of earthing system into TN S NA si rc Transformer secondary grounded by as short a connection as possible I Surge ee ee Grounding of the surge suppressor I
72. tructures of the LV compartment Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 38 60 Schneider Ev Electric Sepam protection relay installation assistance guide Configuration n 2 The supply source insulated is placed inside the MV cubicle The digital sensor is remote from the MV cubicle Case 2 1 the sensor is totally insulated LV compartment MES114 MES114E MES114F Do not connect the supply source to the 2 Zal local earth LV compartment 36 011 DC supply OV 5 zai AC supply N go 1012 m 4 zal 2 Power supply i PT t o4a 4 source a 5 insulated ie Pf 014 122 6 123 j 8 124 Digital sensor o Imlhiin 125 9 Pache 126 1g zo ns 1 T Dna Implementation of cabling between the digital sensor and Sepam s logic input Twisted conductors Cond ctors run along the metallic structures of the MV cubicle then the installation structures cable trunking metal ducts etc Implementation of cabling between the digital sensor and Sepam s logic input The length of the connection is limited to 500 m 1000 m outgoing and incoming if the link is not a shielded twisted pair By not grounding the supply source OV or N data availability can always be guaranteed even in the event of an insulation fault on one of the electrical conductors connected to the digital sensor However if it is necessary to earth the power supply make sur
73. ty can always be guaranteed even in the event of an insulation fault on one of the electrical conductors connected to the digital sensor However if it is necessary to earth the power supply make sure that the power supply is only earthed at one point to avoid any circulation of current Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 45 60 Schneider Ev Electric Sepam protection relay installation assistance guide Inductive load overvoltage limitiation devices The loads controlled by Sepam logic outputs are highly diverse Contactor coil Electromechanical relay coil LED Sepam logic input etc The load controlled by a logic output may be installed in the LV compartment or outside the MV cubicle Special attention must be paid to the control of inductive type loads All inductive loads e g contactor coil cause overvoltage The restoring of the energy stored by a contactor coil when the coil circuit opens results in overvoltage across the terminals of the coil This overvoltage which may be energetic is liable to interfere with electronic equipment Although Sepam is immunized against this type of interference it is highly advisable to use transient voltage suppressor at the terminals of this type of load A few transient voltage suppressor are mentioned below oy foy din e Free wheel diode DC coils only Reverse voltage withstand gt twice the maximum
74. vide an earthing terminal mounted on a symmetrical DIN rail as close as possible to the Sepam accessory MET148 2 RTD module Connect a strap or electrical conductor between the earthing terminal on the ACE949 2 two wire RS485 network interface DIN rail and the earth terminal of the Sepam accessory Tinned copper strap with length lt 200 mm and cross section gt 6 mm ACE959 four wire RS485 network interface or Electrical conductor fitted with a 4 mm ring lug with length lt 200 mm and cross section gt 2 5 mm Sepam accessories How to connect Sepam accessories to the local ground ACE909 2 RS232 RS485 converter Provide an earth terminal mounted on a symmetrical or asymmetrical DIN rail as close as possible to the Sepam accessory ACE919 AC RS485 RS485 interface Connect a strap or electrical conductor between the earthing terminal on the ACE919 DC RS485 RS485 interface DIN rail and the metal casing of the accessory connection point on the back of the metal casing Tinned copper strap with length lt 200 mm and cross section gt 6 mm or Electrical conductor with length lt 200 mm and cross section gt 2 5 mm By control of the different bonding connections high frequency disturbing currents common mode currents may be conveyed on a path the ground LV compartment Remote module Sepam or accessory Shielded connection cable Disturbed connection
75. wire RS 485 network polarization and line end impedance matching resistors Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 51 60 Schneider Electric Sepam protection relay installation assistance guide e ACE 919CA or ACE 919CC RS 485 RS 485 converter ACE 919 converters are used to connect a master central computer equipped with an RS 485 type serial port as a standard feature to stations connected to a 2 wire RS 485 network The ACE 919 converters also provide a 12 V DC or 24 V DC supply for the distributed power supply of the Sepam ACE 949 2 or ACE 959 interfaces The converter offers the possibility of setting the parameters of the the 2 wire RS 485 network polarization and line end impedance matching resistors Line end impedance matching and polarization resistors To guarantee the operation and robustness of the RS 485 communication network make sure to implement the network line end impedance matching and network polarization resistors e Line end impedance matching 150 Q line end resistors Rc are mandatory one at each end of the communication network to perform impedance matching of the communication line Two resistors are required for a 2 wire RS 485 network or 4 resistors for a 4 wire RS 485 network e RS 485 network polarization Polarization of the communication network results in a continuous flow of current in the network putting all the receivers in deactivated status when no transmitter h
76. wire link preferable or cable shielded by tinned braid If a shielded cable is used the cable shielding must be connected to Sepam by a link less than 2 cm long No additional grounding of the cable is to be done bonding connection via Sepam Cable less than or equal to 20 m long outgoing incoming with linear R lt 100 milliOhms m Cable run along the metal structures The cable must be separated along the entire length low level analog link The CSH120 200 core balance cE 7 Is centered around the MV cabfe s The MV cable shielding goes back through the CSH120 200 core balance CT The shielded cable between the CSH120 200 core balance CT should not be grounded at the CSH120 200 core balance CT level bonding connection via Sepam The shielding reference point s should be connected to the main earthing terminal of the MV cubicle In other it is necessary to make sure that the earthing is interconnected with the main earthing terminal of the MV cubicle Copyright Schneider Electric Industries SAS 2005 51312779F0 A2 19 60 Schneider Ev Electric Sepam protection relay installation assistance guide CSH30 interposing ring CT The CSH30 interposing ring CT is used when residual current is measured by a current transformer with a 1A or 5A secondary circuit The CSH30 interposing ring CT adapts the signals between the current transformer and the Sepam residual current input The CSH30 interposing ring CT
77. y A surge suppressor if the installation is situated in an area highly exposed to lightning overhead MV line lightning strike density gt 1 An EMC filter if the installation is located in a highly disturbed electromagnetic environment e g very high power motor very high power converter These components should be included as of the point at which the supply conductors enter the LV compartment When the supply sources are mounted on a DIN rail a ground terminal can be used to ground reference the OV or the neutral of the Sepam supply source b Sepam supply source transferred outside the LV compartment The Sepam supply source may be transferred outside the LV compartment e g installed in an auxiliary distribution panel In such cases particular precautions must be considered The Sepam supply conductors may be source of disturbing currents induced by the presence of surrounding conductors e g power conductors These disturbing currents are conveyed on the Sepam supply lines and may alter Sepam operation In such conditions make sure that the power supply conductors are held together use of a twisted wire connection and run along the metallic structures of the installation Nevertheless these precautions may sometimes prove to be insufficient since the equipotential bonding in the installation is not guaranteed or because the proximity of disturbing devices in the vicinity is too great a constraint Overvoltage

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