Service Manual Type MVTI Instantaneous Voltage Relays
Contents
1. MVTI 12 Overvoltage relay and MVTI 11 Undervoltage relay See figures 1 and 2 for test circuits for the 57 70V 57 120V 100 120V and 380 440V versions respectively IF the 380 440V version is being commissioned a step up transformer is needed to allow the calibration of the settings to be checked Check that the flag is reset and slowly increase the ac voltage until the flag illuminates Record the pick up value Slowly lower the voltage to see when the flag can be reset This is the drop off value and should be recorded The allowable errors on the voltage settings are 2 on the lowest setting and 4 on all other settings No allowance has been made for instrument errors The drop off value should be within 5 of the pick up value Alternative test method for 380 440V versions of MVTI 12 and MVTI 11 This method should be used only when no step up transformer is available See Figure 3 for test circuit Firstly measure accurately the resistance of the dropper resistor assembly Rext 2 With the relay on the lowest setting and the dropper resistor Rext 2 removed from the circuit measure the pick up voltage directly at the relay terminals 27 and 28 and the ac current into the relay at the pick up voltage Use the following formula to calculate the effective pick up voltage Veg Vat IMRM where Vet effective pick up voltage VM measured pick up voltage with Rext 2 out of circuit IM measured pick up current with Rext 22. safety hazard The recommended minimum earth wire size is 2 5 mm unless otherwise stated in the technical data section of the product documentation Before energising the equipment the following should be checked Voltage rating and polarity CT circuit rating and integrity of connections Protective fuse rating Integrity of earth connection where applicable Equipment operating conditions The equipment should be operated within the specified electrical and environmental limits Current transformer circuits Do not open the secondary circuit of a live CT since the high voltage produced may be lethal to personnel and could damage insulation External resistors Where external resistors are fitted to relays these may present a risk of electric shock or burns if touched Battery replacement Where internal batteries are fitted they should be replaced with the recommended type and be installed with the correct polarity to avoid possible damage to the equipment Insulation and dielectric strength testing Insulation testing may leave capacitors charged up to a hazardous voltage At the end of each part of the test the voltage should be gradually reduced to zero to discharge capacitors before the test leads are disconnected Insertion of modules and pcb cards These must not be inserted into or withdrawn from equipment whilst it is energised since this may result in damage Fibre optic communication Where fibre
3. Check that the ac is present between terminals 27 and 28 Check that for the 380 AAOV ac versions of the MVTI 11 and MVTI 12 the series resistors are fitted in series with the ac supply terminals Printed circuit board tests If all the connections are intact and the supplies are of the correct voltage and polarity it is likely that the fault will lie somewhere in the module Proceed to the next two sections to try to confirm this Measurements of the dc operating currents of the modules By monitoring the dc operating current of a module a good indication is provided that the module is connected correctly and that the dc power supply section is operating correctly if the current measured lies within about 10 of the specified value Allowances must be made for supply voltages deviating from the lower rated voltage as this has a significant effect on the dc burden These dc burden tests should be carried out in the operated and non operated state that is with the ac input both above and below the voltage setting level An ammeter should be connected in the positive supply line to measure these burdens Typical values for the dc burdens are shown in the following tables for the MVTI 11 and MVTI 12 Page 17 6 5 2 Burdens MVTI 11 Instantaneous Undervoltage Relay Nominal voltage range V 30 34 48 54 110 125 220 250 Series dropper resistor Rp ohm None 220 Ik 4k7 Rext 1 Parallel 4k7 DC voltage supplied for test
4. ESD Connection of the MMLG test block Earthing Insulation check Functional testing DC auxiliary supply check Test block type MMLG Voltage setting check Operation times Final setting checks LED flag and contact check Final checks MAINTENANCE Visual inspection Functional checks PROBLEM ANALYSIS Test equipment required for fault finding Inspection removal of module from cases Connections for MVTI 11 and MVTI 12 Checking voltage supplies to module Printed circuit board tests Measurements of the dc operating currents of the modules Measurement of the ac operating currents of the modules Repairs and replacements Calibration information Replacement parts ordering information COMMISSIONING TEST RECORD REPAIR FORM Page 4 SAFETY SECTION This Safety Section should be read before commencing any work on the equipment Health and safety The information in the Safety Section of the product documentation is intended to ensure that products are properly installed and handled in order to maintain them in a safe condition It is assumed that everyone who will be associated with the equipment will be familiar with the contents of the Safety Section Explanation of symbols and labels The meaning of symbols and labels which may be used on the equipment or in the product documentation is given below A Caution refer to product documentation Caution risk of electric shock Functional earth terminal Note
5. this symbol may also be used for a protective safety earth terminal if that terminal is part of a terminal block or sub assembly eg power supply e Protective safety earth terminal ws Note The term earth used throughout the product documentation is the direct equivalent of the North American term ground Installing Commissioning and Servicing Equipment connections Personnel undertaking installation commissioning or servicing work on this equipment should be aware of the correct working procedures to ensure safety The product documentation should be consulted before installing commissioning or servicing the equipment Terminals exposed during installation commissioning and maintenance may present a hazardous voltage unless the equipment is electrically isolated If there is unlocked access to the rear of the equipment care should be taken by all personnel to avoid electric shock or energy hazards Voltage and current connections should be made using insulated crimp terminations to ensure that terminal block insulation requirements are maintained for safety To ensure that wires are correctly terminated the correct crimp terminal and tool for the wire size should be used Page 5 Before energising the equipment it must be earthed using the protective earth terminal or the appropriate termination of the supply plug in the case of plug connected equipment Omitting or disconnecting the equipment earth may cause a
6. V 30 48 110 g pp Relay on standby 27 39 71 Vin gt V setting Current consumption mA Relay output energised 65 67 7 Vin V setting Burdens MVTI 12 Instantaneous Overvoltage Relay Nominal voltage range V 30 34 48 54 110 125 220 250 Series dropper resistor Rp ohm None 220 Ik Rext 1 Parallel 4k7 DC voltage supplied for test V 30 48 110 g PP Relay on standby 27 39 71 Vin gt V setting Current consumption mA Relay output energised 65 67 7 Vin V setting Measurement of the ac operating currents of the modules Monitor the ac input current by connecting an ammeter in series with one input terminal and the source This test should be done at the following input voltages 63 5V on 57 70W and 57 120V versions of MVTI 11 110V on 100 120V version of MVTI 11 and MVTI 12 415V on 380 440V version of MVTI 11 and MVTI 12 The current through the transformer primary should be approximately 6mA IF the measured current is zero suspect an open circuit primary winding series resistor or connection IF the measured current exceeds 8mA check that the external dropper resistors are correctly fitted 380 440V version only Also check that the series resistor R11 fitted on the pcb is the correct value If these are correctly fitted then the primary windings may be shorted together Page 18 6 6 6 7 6 8 Repairs and replacements The instructions given enable the detection of faults t
7. between all supply circuits and earth and also between independent circuits Compliance is demonstrated by reference to generic safety standards Compliance with the European Commission Low Voltage Directive Compliance is demonstrated by reference to generic safety standards Section 1 DESCRIPTION OF SETTINGS Voltage settings The setting voltage is determined by the positions of the six dual in line switches The sum of all the voltages shown by each respective switch position and the constant value gives the required setting voltage For example an MVTI 11 with the switches set to the position shown corresponds to a setting of 32 26 58V ac 0 Voltage 2 0 Vs 32 Y Volt setting 2 O 32 2 8 16 switches 2 0 58V 8 0 6 0 For other versions the setting method is identical Refer to the name plate on each individual relay Section 2 AUXILIARY EQUIPMENT 2 1 2 2 External series resistors The following dropper resistors pre mounted on an external assembly marked with the relay serial number are supplied with each relay when required The serial numbers of the assemblies are listed below together with the resistor values MVTI 11 Undervoltage Relay ac Resistor Dropper resistor values fitted rating V i assembly 50 60Hz part number dc series ac series resistor ohm resistor ohm Rext Rext 2 100 200 57 120 30 34 Not required 57 70 380 440 30 34 ZEO103 020 100 112 57 120
8. completely isolating the supplies to the relay both poles of any dc supply the capacitors should be safely discharged via the external terminals prior to decommissioning Disposal It is recommended that incineration and disposal to water courses is avoided The product should be disposed of in a safe manner Any products containing batteries should have them removed before disposal taking precautions to avoid short circuits Particular regulations within the country of operation may apply to the disposal of lithium batteries Page Z Technical Specifications Protective fuse rating The recommended maximum rating of the external protective fuse for this equipment is 16A Red Spot type or equivalent unless otherwise stated in the technical data section of the product documentation Insulation class IEC 61010 1 1990 A2 Class EN 61010 1 1993 A2 Class Installation IEC 61010 1 1990 A2 Category Category Ill Overvoltage EN 61010 1 1993 A2 Category Ill Environment IEC 61010 1 1990 A2 Pollution degree 2 EN 61010 1 1993 A2 Pollution degree 2 Product safety 73 23 EEC C EN 61010 1 1993 A2 EN 60950 1992 A11 Page 8 1995 1995 1995 1995 1995 1995 1995 1997 This equipment requires a protective safety earth connection to ensure user safety Distribution level fixed installation Equipment in this category is qualification tested at 5kV peak 1 2 50us 5000 0 5J
9. out of circuit RM measured resistance of Rext 2 The drop off voltage can be found in the same way The pick up voltage should be within 2 of the lowest setting voltage No allowance has been made for instrument errors This test has checked the calibration point of the relay The other relay settings need only be checked to see that they are functioning Refer to tests 2 7 in Table 1 for the appropriate switch positions Page 14 4 5 4 ASD 4 5 6 4 5 7 With the dropper resistors Rext 2 still out of circuit monitor the voltage at the relay terminals 27 and 28 slowly increase the voltage until the relay picks up and record the pick up value Slowly lower the voltage until the relay drops off and record the drop off value IF the pick up voltage at the 400V setting is Z the measured pick up voltages at the other settings should be higher than the 400V setting by the amounts shown Test number Setting voltage Pick up voltage at relay input Terminals 27 amp 28 Z Z 2V IV Z A AV IV Z 17V 2V Z 66V AV Operation times MVTI 11 Undervoltage Connect the other pole of the switch to start the electronic timer open to start mode and one output contact to stop the timer Set the volts at least 10 above the setting with the switch on Switch off and record the time The time will vary a little with the point on the sinewave when the switch is operated therefore time a number of operations All tim
10. voltage setting switches set to each of the positions shown in the table below l switch closed left hand position O switch open right hand position Table 1 MVTI 11 MVTI 11 MVTIIT MVT 11 MVTLI2 MVTI 12 MVTI 12 MVTI 12 Switch 123456 57 70V 57 120V 100 120V 380 440V 100 120V 380 440V 57 70V 57 120V 000000 100000 010000 001000 000100 000010 111111 When the switches have been set for each test the cover should be replaced to ensure that the flag is always reset with the cover reset mechanism The relays should be connected as shown in the circuit diagram Figures 1 2 and 3 Page 13 MVTI 11 Undervoltage relay see Figure 1 The ac input voltage should be increased to a value above the setting value and the flag reset Slowly decrease the input vltage until the relay picks up when the light emitting diode LED illuminates Record the pick up Slowly increase the voltage checking to see when the relay drops off when the LED indicator can be reset This is the drop off value and should be recorded Alternatively the pick up and drop off values can be determined using an ohmmeter connected across the contacts Repeat the test for each of the settings shown in Table 1 The allowable errors on the voltage settings are 2 on the lowest setting and 4 on all other settings No allowance has been made for instrument errors The drop off value should be within 5 of the pick up value
11. yi V V Page 21 Page 22 Section 7 COMMISSIONING TEST RECORD Instantaneous Voltage Relay Type MVTI Date Station Circuit Relay model No MVTI Serial No Rated AC voltage V Rext 2 if required E DC Auxiliary voltage Vx Rext 1 if required el Nominal voltage setting Po Actual pick up value x lg o Actuol drop off volue Fs Operation times l JL JJ Jl 1L m Contacts checked Terminas1 33 5 _ 2 4 EL N Aus P I Commissioning Engineer Customer Witness Date Date Page 23 Page 24 REPAIR FORM Please complete this form and return it to ALSTOM T amp D Protection amp Control Ltd with the equipment to be repaired This form may also be used in the case of application queries ALSTOM T amp D Protection amp Control Ltd St Leonards Works Stafford ST17 ALX England For After Sales Service Department Customer Ref Model No ALSTOM Contract Ref Serial No Date 1 What parameters were in use at the time the fault occurred AC volts Main VT Test set DC volts Battery Power supply AC current Main CT Test set Frequency 2 Which type of test was being used 3 Were all the external components fitted where required Yes No Delete as appropriate 4 List the relay settings being used 5 What did you expect to happen continued overleaf Page 25 6 What did happen 7 When did the fault occur Instant Yes No Intermittent Yes No Time delayed Yes N
12. 48 54 FJO340 007 220R 57 70 380 440 48 54 ZEO103 021 220R 380 440 110 125 ZEO103 022 100 120 57 120 220 250 ZEO103 018 2 x Ak7 in 57 70 parallel 380 440 220 250 ZEO103 023 2 x Ak7 in parallel Page 9 100 120 57 120 110 125 FJO340 001 57 70 2 3 MVTI 12 Overvoltage Relay ac Relay dc Resistor Dropper resistor values fitted rating V rating V assembly 50 60Hz part number dc series ac series resistor ohm resistor ohm Rext Rext 2 57 70 100 120 30 34 None required 57 120 380 440 30 34 ZEO103 020 pe 57 70 100 120 48 54 FJO340 007 220R 57 120 380 440 48 54 ZEO103 021 220R 110 125 FJ034000 380 440 110 125 ZEO103 022 57 70 100 120 220 250 ZEO103 018 RN 57 120 parallel 57 70 380 440 220 250 ZEO103 023 Pr 57 120 parallel The MVTI 12 is initially calibrated with this external resistor assembly and if the assembly or any of the resistors on it are changed the relay must be recalibrated Section 3 INSTALLATION 3 1 3 2 3 3 Precautions Protective relays although generally of robust construction require careful treatment prior to installation and a wise selection of site By observing a few simple rules the possibility of premature failure is eliminated and a high degree of performance can be expected Packing The relays are either despatched individually or as part of a panel rack mounted assembly in cartons specifically designed to protect them from damage Inspec
13. NIN ZX Ag N IMN VANN KN N Service Manual Type MVTI Instantaneous Voltage Relays ALSTOM Service Manual Type MVTI Instantaneous Voltage Relays HANDLING OF ELECTRONIC EQUIPMENT A person s normal movements can easily generate electrostatic potentials of several thousand volts Discharge of these voltages into semiconductor devices when handling electronic circuits can cause serious damage which often may not be immediately apparent but the reliability of the circuit will have been reduced The electronic circuits of ALSTOM T amp D Protection amp Control Ltd products are completely safe from electrostatic discharge when housed in the case Do not expose them to the risk of damage by withdrawing modules unnecessarily Each module incorporates the highest practicable protection for its semiconductor devices However if it becomes necessary to withdraw a module the following precautions should be taken to preserve the high reliability and long life for which the equipment has been designed and manufactured Before removing a module ensure that you are at the same electrostatic potential as the equipment by touching the case Handle the module by its front plate frame or edges of the printed circuit board Avoid touching the electronic components printed circuit track or connectors Do not pass the module to any person without first ensuring that you are both at the same electrostatic potential Shaking hands achieves equipo
14. Visual inspection Isolate all supplies and withdraw the module from the case using the two black handles on the relay Inspect the printed circuit board for any sign of loose components or connections Your attention is drawn to the fact that the relay can be damaged by electrostatic discharges The pcb should not be touched unless precautions have been taken See details at the front of this publication Functional checks Periodic function tests should be carried out using the test procedures shown in the commissioning section Section 6 PROBLEM ANALYSIS 6 1 6 2 These instructions enable a fault to be localised to sub assembly level Fault finding to component level is not recommended The main reasons for this are as follows fault finding on printed circuit boards requires the use of specialised knowledge and equipment components used in manufacture are subject to strict quality control and in certain cases selected for particular characteristics Complementary metal oxide silicon CMOS components are used which require extremely careful handling damage can be caused to the printed circuit track unless extreme care is used in the replacement of components replacements of some components will necessitate recalibration of the relay Test equipment required for fault finding Equipment required for fault finding is minimal and consists of the following Digital multimeter with ranges of 0 1000V ac d
15. c and O IA ac dc DC voltage supply 30V 0 5A AC voltage source O 500V 50Hz 10mA Relay tool kit Inspection removal of module from cases Unscrew the two front cover screws and remove the clear plastic front cover Ensure that the dc supply is isolated and then withdraw the module assembly by the two black handles A quick inspection of the relay may result in the detection of obvious faults i e loose components or connections Otherwise proceed to the next section Page 16 6 3 6 4 6 5 6 5 1 Connections for MVTI 11 and MVTI 12 The connections between the relay terminals and the rest of the system are listed below Terminal connections Terminals 13 and 14 are connected to the positive and negative dc supply Terminals 1 to 6 are the tripping outputs of the relay Terminals 27 and 28 are the ac input Checking voltage supplies to module The dc voltage ratings available are 30 34V 48 54V 110 125V and 220 250V Where voltage sources which are higher than 30V are used external dropper resistors are connected in series with the positive supply rail Check that the dc supply voltage is present and that the polarity is correct between terminals 13 and 14 on the relay case terminal block when the module is removed from the case Note that when the module is in the case and the supply is connected the voltage across the terminals may be less due to the voltage drop across the external dropper resistor Rp if fitted
16. ed together Deliberate circuit earthing links removed for the tests must subsequently be replaced Functional testing Equipment required All versions Variac transformer DC voltmeter to check nominal dc volts AC voltmeter to cover setting range Resistance meter AC ammeter 0 10mA 1 Double pole switch Electronic timer MVTI 11 8 MVTI 12 380 440V versions only Step up transformer to cover setting range of 380 440V relay Note Measuring accuracy depends on the accuracy of the instruments used Page 12 4 5 4 5 2 4 5 3 DC auxiliary supply check Ensure that the correct series dropping resistor s are fitted if required Remove the relay from its case and check that the incoming dc supply at the relay case terminals 13 positive ve and 14 negative ve is within the range specified below Rated dc voltage V DC operative range V 30 34 48 54 110 125 220 250 Test block type MMLG If a test block is included in the scheme it may also be associated with protection CT circuits It is important that the sockets in the type MMLB O1 test plug which correspond to the current transformer secondary windings are LINKED BEFORE THE TEST PLUG IS INSERTED INTO THE TEST BLOCK DANGER DO NOT OPEN CIRCUIT THE SECONDARY CIRCUIT OF A CURRENT TRANSFORMER SINCE THE HIGH VOLTAGE PRODUCED MAY BE LETHAL AND COULD DAMAGE INSULATION Voltage setting check The pick up and drop off voltages of the relay should be measured with the
17. es obtained should be less than AO ms MVTI 12 Overvoltage Connect the other pole of the switch to start the electronic timer close to start mode and one of the output contacts to stop the timer Switch on set the volts to at least 2076 above the setting switch off Close the switch and measure the operation time The time will vary a little with the point on the sinewave when the switch is operated therefore time a number of operations All times obtained should be less than 40 ms Final setting checks Adiust the voltage setting to its functional setting and measure the pick up and drop off values as already mentioned Check that they are within the stated tolerance LED flag and contact check Check that the LED flag and reset pushbutton operate satisfactorily Also check that the contacts operate by means of continuity checks Final checks Operate the relay with the trip and alarm links restored to ensure that the trip and alarm circuits are energised according to the relevant schematic diagram Remove all test leads test switches temporary shorting leads etc Replace any links which have been removed to facilitate testing If a test plug MMLB and test block MMLG have been used remove the test plug CAUTION Replace the test block cover to put the protection in service Page 15 Section 5 MAINTENANCE 3 1 5 2 Periodic maintenance is not necessary However periodic inspection and test is recommended
18. mid conditions and may be restored by gently heating the bag for about an hour prior to replacing it in the carton Dust which collects on a carton may on subsequent unpacking find its way into the relay in damp conditions the carton and packing may become inpregnated with moisture and the de humidifying agent will lose its efficiency Storage temperature 25 C to 70 C Siting The installation should be clean dry and reasonably free from dust and excessive vibration The site should preferably be well illuminated to facilitate inspection An outline diagram is normally supplied showing panel cut outs and hole centres For individually mounted relays these dimensions will also be found in Publication R6033 Section 4 COMMISSIONING TESTS 4 1 CAUTION Damage is likely to be incurred if the flag indicator armature assembly of a miniature relay is actuated manually with a screwdriver probe Flags should always be reset with the cover in position by the facility provided Inspection and wiring check Carefully examine the module and case to see that no damage has occurred during transit Check that the serial numbers on the module case cover and resistor assembly when an assembly is required are identical and that the model number and rating information are correct Check that the external wiring is correct to the relevant relay diagram or scheme diagram The relay diagram number appears inside the case Particular attenti
19. o Delete as appropriate By how long 8 What indications if any did the relay show 9 Was there any visual damage 10 Any other remarks which may be useful Signature Title Name in capitals Company name Page 26 Page 27 ALSTOM ALSTOM T amp D Protection amp Control Ltd St Leonards Works Stafford ST17 ALX England Tel 44 0 1785 223251 Fax 44 0 1785 212232 Email pcs enquiries tde alstom com Internet www alstom com 1999 ALSTOM T amp D Protection amp Control Ltd Our policy is one of continuous product development and the right is reserved to supply equipment which may vary from that described Publication R8033C Printed in England
20. o sub assembly level If it is believed that the module is faulty ALSTOM T amp D Protection amp Control Ltd should be contacted quoting the relay module number and serial number Calibration information All relays are supplied precalibrated The 380 440V ac versions of the MVTI 11 and MVTI 12 are calibrated with the external series dropper resistors Rext 2 fitted on the resistor assembly supplied with the module If any external ac series resistor or the printed circuit board assembly itself is exchanged the relay will require recalibration The dc series dropper resistor Rext 1 may be exchanged without affecting the relay calibration It is recommended that the re calibration of a module is undertaken by ALSTOM T amp D Protection amp Control Ltd Replacement parts ordering information When ordering any spares please quote the relay model number and serial number as well as the printed circuit board part number Repairs Should the need arise for the equipment to be returned to ALSTOM T amp D Protection amp Control Ltd for repair or re calibration then the form at the back of this manual should be completed and sent with the equipment together with a copy of any commissioning test results Page 19 L ILAW edA Kojae1 eBpjjoneAo snoeupjuojsur JOj NDOW oos u4Doip uoyosuddy eJnDij uoiipuoo eBoj oAJepun doys uup UD JO Y Y Z YE Y SJOUIWIA ssoJ2D expui I SPOJU 9509 oJBi lu ui ejojs pesiDueue e
21. on should be paid to the wiring of the external resistors Rext 1 and Rext 2 to the relay if required on scheme Page 1 4 1 1 4 2 4 3 4 4 4 5 Electrostatic discharges ESD The relay uses components which are sensitive to electrostatic discharges When handling the module care should be taken to avoid contact with components and electrical connections When removed from the case for storage the module should be placed in an electrically conducting anti static bag See full recommendations inside the front cover of this manual Connection of the MMLG test block If an MMLG test block is provided the connections should be checked to the scheme diagram particularly that the supply connections are to the live side of the test block coloured orange the odd numbered terminals The auxiliary supply voltage to the scheme should be routed via the test block terminals 13 to 15 To facilitate ease of wiring the MMLG should be located at the right hand side of the assembly Earthing Ensure that the case earthing connection above the rear terminal block is used to connect the relay to the local earth bar Insulation check The relay and its associated wiring may be insulation tested between all electrically isolated circuits all circuits and earth An electronic or brushless insulation tester should be used having a dc voltage not exceeding 1kV Accessible terminals of the same circuit should first be strapp
22. optic communication devices are fitted these should not be viewed directly Optical power meters should be used to determine the operation or signal level of the device Page 6 gt gt e P P gt gt Older Products Electrical adjustments Equipments which require direct physical adjustments to their operating mechanism to change current or voltage settings should have the electrical power removed before making the change to avoid any risk of electric shock Mechanical adjustments The electrical power to the relay contacts should be removed before checking any mechanical settings to avoid any risk of electric shock Draw out case relays Removal of the cover on equipment incorporating electromechanical operating elements may expose hazardous live parts such as relay contacts Insertion and withdrawal of extender cards When using an extender card this should not be inserted or withdrawn from the equipment whilst it is energised This is to avoid possible shock or damage hazards Hazardous live voltages may be accessible on the extender card Insertion and withdrawal of heavy current test plugs When using a heavy current test plug CT shorting links must be in place before insertion or removal to avoid potentially lethal voltages Decommissioning and Disposal Decommissioning The auxiliary supply circuit in the relay may include capacitors across the supply or to earth To avoid electric shock or energy hazards after
23. p ay u UMOUS SID Z 13 Y Ty SPOON JD9J WO POMAIA AOE oyl 9019 D 9 a npo 1940816 sei ddns 5 1 104 Ajuo peuinbea s es y ed LA uo JODIDA eo suoljo uuoO A E uo p2Id euo uAous sp suou2euuoo Buiuup3 7 E puiuue Buo c 9 8d Le x p TA OU e19u 9 e10jeq sYpauquua uous T ce q swas s A LY OZZ SB5pl oA moj uo pesn uaym o AQ upul 1940916 syndul PS cc m a o Bpl oA O V 104 p uinb u s Z xey 9 au EJON gt amp Z ajou eec CLT e 8 s 2DjuO K E dno L m Y lly ejou 985 E T Deni 114 e UDI esp S 4 Br S INOJI dnd A lt 9 ajou aac e l LC Z xy LONDON espud 2 q Yo _ Page 20 ZI HAW edA Koje1 eBoj o 1e o snoeupjunjsui 1o npoui 3105 wo4bo p uouooijddy g ainbi4 doys yoa 8509 p1Bi lu ui NOS VON 109J WOJ Pamal Jaj0e16 saijddns G 104 Ajuo p nb si xo Tae ods ae een S e en SEELEN uo jooid 810 uAous sp suolo uuoo Butuup3 7 _ pue BuO e 5 zZ za ph A OU 19UA 9 e101eq syp iquu l uous ce q swajs s AG y DDpI OA MOJ uo p sn u uA a ni Laon a anda seus bri e Qs o eBpj oA O V 104 peuinbei s Z Key one SION L e Z ejou T D c LTA e 8 sjODJUO7 K _ IndinO Y L y ejou eec R Y TERT xe UE LH 1 xey e ubg 95D E ez e DET ee c 9 3 ZC z mer UONDJOY soyd 2 d
24. tential Place the module on an antistatic surface or on a conducting surface which is at the same potential as yourself Store or transport the module in a conductive bag More information on safe working procedures for all electronic equipment can be found in BS5783 and IEC 60147 OF IF you are making measurements on the internal electronic circuitry of an equipment in service it is preferable that you are earthed to the case with a conductive wrist strap Wrist straps should have a resistance to ground between 500k 10M ohms If a wrist strap is not available you should maintain regular contact with the case to prevent the build up of static Instrumentation which may be used for making measurements should be earthed to the case whenever possible ALSTOM T amp D Protection amp Control Ltd strongly recommends that detailed investigations on the electronic circuitry or modification work should be carried out in a Special Handling Area such as described in BS5783 or IEC 60147 OF ALSTOM TYPES MVTI 11 Static Modular Instantaneous Undervoltage Relays MVTI 12 Static Modular Instantaneous Overvoltage Relays Contents SAFETY SECTION DESCRIPTION OF SETTINGS Voltage settings AUXILIARY EQUIPMENT External series resistors MVTI 11 Undervoltage MVTI 12 Overvoltage INSTALLATION Precautions Packing Inspection Unpacking Storage Siting COMMISSIONING TESTS Inspection and wiring check Electrostatic discharges
25. tion Relays should be examined immediately they are received to ensure that no damage has been sustained in transit If damage due to rough handling is evident a claim should be made immediately to the transport company concerned and the nearest ALSTOM T amp D Protection amp Control Ltd representative should be promptly notified Relays which are supplied unmounted and not intended for immediate installation should be returned to their protective polythene bags Page 10 3 4 3 5 3 6 Unpacking Care must be taken when unpacking and installing the relays so that none of the parts is damaged or their settings altered and they must at all times be handled by skilled persons only Relays should be examined for any wedges clamps or rubber bands necessary to secure moving parts to prevent damage during transit and these should be removed after installation and before commissioning Relays which have been removed from their cases should not be left in situations where they are exposed to dust or damp This particularly applied to installations which are being carried out at the same time as constructional work Storage If relays are not installed immediately upon receipt they should be stored in a place free from dust and moisture in their original cartons and where de humidifier bags have been included in the packing they should be retained The action of the de humidifier crystals will be impaired if the bag has been exposed to hu
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