MNS® Low Voltage Switchgear
Contents
1. Forge rar Een Tee agus Ee Ee E h i e TTEN GLES GES 503 22 Pi 17 eat pum irei Se a E mung mt am Loa cum eure RL emt FRED ee The Brad of Pacey lux apelin dm Ee egen Tha vu pemarmaky zd ERG Vah F Pig be EI Be Pipi ps a Tas 5 EOS en MEM Pee dee r eg cee eg Pom Sr Ria BETA Girama mmm ne MOM MA fp CH Ac Mant amh camme ni jai nd m o iamiam si simn azman a F F a ae K Gen Fre a end mi zo FU We jog Switchgear Design Switchgear Design Functional Compartments and Segregation The assembly is divided into compartments thus separating different functional areas Incoming circuit breaker solution Equipment compartment The equipment compartment is divided into 3 Sub sections each sub section having its own door center sub section accommodates the circuit breaker and associated equipment in fixed or withdrawable design Depending upon the option for cable entry for example with top entry solution access to incoming connections is via the door in the upper sub section the auxiliary co2. ABB exceeds these levels as a standard The MNS low voltage switchgear system has been subjected to extensive type tests com pliance with the standards In order to ensure the highest possible degree of safety ABB continues to conduct tests as per a continuous development program These tests are based on the most critical representative applications of the entire product or performance range of the switchgear with respect to the test standard The results of these tests are applicable to the various low voltage switchgear and control gear assemblies TTA in accordance with IEC 60439 1 DIN EN 60439 1 VDE 0660 Part 500 E mee 111108395 05 In addition to the above specifications adopted as a standard IEC 61641 for testing under conditions of arcing due to an internal fault To meet the requirements of IEC 61641 the switchgear 15 connected and supplied cor responding to the normal service arrangement An arc is then initiated within the switchgear the point of ignition is chosen to produce the most stress on the assembly There are five criteria observed for the test in line with its Safety Plus statement ABB ensures that all five are met In addition to these five criteria ABB also meets the addition plant protection criteria as detailed in VDE 0660 part 500 For more information on arc fault containment the MNS Safety Aspects brochure delivers essential considerations concerning plant a
3. shaped steel profiles with a 25 mm hole pitch according to DIN 43660 This 25 mm equals the dimension of 1E used in MNS to define the area usage within the switchgear Each cubicle is precision constructed by bolting horizontal and vertical profiles together to form a rigid modular structure The assembly is maintenance free as a result of the construction method utilizing a combination of thread locking ESLOK screws with bolted pressure plates and thread forming screws The profiles are galvanic protected Zn or Al Zn against corrosion EE i 1 Enclosure MNS switchboard enclosure is made of sheet steel protected by galvanic coating and powder coating for maximum durability The fixing of the enclosure with respect to doors roof plates rear and side walls is achieved with thread forming screws Final construction varies depending upon the required degree of protection In accordance with the general safety philosophy followed with MNS each compartment and sub compartment which requires access for commissioning operation or maintenance has its own door Busbar System Main Busbars The MNS main busbar system is arranged in the rear of the switchgear This assures a maximum distance between the busbars and the operator and maintenance staff The main busbar system is fully separated from the equipment compartment as well as from the cable compartment Switchgear Design The busbar
4. and plant associated Each condition has a cause and suggested action for problem resolution Asset monitoring sets the next standard for integrated maintenance procedures enabling higher switchgear availability through Proactive maintenance Reference H Reference For more information on MNS please refer to the following documents MNS Service Manual 1TGC902006M0402 z CC eee m MNS S System Guide 11GC910001B0202 B eae SACE Technical Catalogue ACBs 1SDC200006D0203 H eege SACE Technical Catalogue 1SCC301001C0202 Switches Switch Disconnectors Annex The following details are intended as a checklist for the specification of low voltage switchgear Items subject to agreement between manufacturer and user Extract from IEC 60439 1 Annex E Subclause of Subject IEC 60439 1 Rated diversity factor 6 1 1 2 Note Use of ASSEMBLIES in an arctic climate 6 6 1 3 Note Use of electronic equipment at altitudes above 1 000 m Special service conditions 6 2 10 Electrical and radiated interferences ASSEMBLIES degree of protection of the bottom to be indicated also 7 4 6 2 Accessibility for maintenance 74 6 3 Accessibility for extension under voltage Values of prospective short circuit current in case of several incoming units or outgoing units for high power rotating machines Co ordination of short circuit protective devices EI Conditions during transport storage and
5. 02006 0402 MNS Safety Aspects Publication no 11 2 900009 0201 Further information on the integrated switch gear platform MNS S can be obtained from MNS iS System Guide Publication no 11GC910001B0203 Content 4 d Q SARIS MNS Switchgear Overview Switchgear Evolution Features amp Applications Typical Set up Technical Data Operational Safety and Availability Switchgear Design Functional Compartments and Segregation Switchboard Arrangements Switchboard Dimensions Mechanical Design Busbar System Outgoing Modules Plug in Modules Withdrawable Modules Incoming Solutions Integration into plant wide Control Systems After Sales and Service Reference Annex O 11 12 12 13 13 14 15 19 20 22 26 28 32 33 MNS System Overview MNS Switchgear Overview Switchgear Evolution ABB is the global leader for low voltage With these credentials it is no surprise that the switchgear with over 1 2 million MNS cubicles MNS system is the benchmark for operational delivered worldwide since the inception of this Safety reliability and quality system in 1973 history in switchgear can be traced back even further to the 18905 ABB draws on this wealth of background when we first manufactured switchgear knowledge in designing and manufacturing systems in Sweden low voltage switchgear for its global and l
6. MNS Low Voltage Switchgear System Guide N em e activate Value NH intelligent MNS is a registered trademark Microsoft Windows and Windows XP are registered trademarks of Microsoft Corporation MODBUS is a registered trademark of Schneider Automation PROFIBUS is a registered trademark of PROFIBUS Nutzerorganisation e V PNO Technical descriptions relate to MNS 3 0 ABB assumes no responsibility for any errors that may appear in this document In no event shall ABB be liable for direct indirect special incidental or consequential damages of any nature or kind arising from the use of this document nor shall ABB be liable for incidental or consequential damages arising from use of any software or hardware described in this document This document and parts thereof must not be reproduced or copied without ABB s written permission and the contents thereof must not be imparted to a third party nor be used for any unauthorized purpose The software described in this document is furnished under a license and may be used copied or disclosed only in accordance with the terms of such license All rights reserved Copyright 2007 ABB Automation Products GmbH Ladenburg Germany MNS System Guide This guide is intended to be used along with other publications related to MNS Low Voltage Switchgear such as MNS Service Manual Erection Operation and Commissioning Publication no 1 9 9
7. ar Design Power Contact Connection to the distribution bar is realized using the precision engineered MNS power contacts The power contact is characterized by a turnable bearing thus decoupling cable stress and electrical contact Consequently any cable bending forces cannot affect the stability of the power contact mechanical stabilisation is achieved by the supporting plate and the contact spring where the contact fingers ensure positive electrical contact Contact fingers are silver plated as standard The contact has been subjected to several tests in order to prove the sophisticated design and the high quality which provides a life cycle up to 1000 insertions Tests test acc IEC 60439 1 Corrosion test acc DIN 50017 IEC 60068 2 60 Crimping quality check acc IEC 61238 1 Vibration and shock test acc IEC 60068 2 6 and IEC 60068 2 27 System Highlights Operational life cycle up to 1000 insertions independently certified Bearing construction eliminating cable stress Full single phase segregation assured prior to the connection of the power contacts to the distribution bars Outgoing Modules Personal Safety Withdrawable Modules Time effort Tools for module required exchange Plug in Slimline for Mean time Modules module to repair exchange MTTR Fixed Modules Eee Required Personnel Qualification T
8. ent Mining Steel Food Marine as well as for infrastructure requirements Data centers Airports Office buildings Shopping centers Hospitals Rail S Jj D F P a H 1 Overvi System MNS Typical Set up e Hai i Le ss ss ss ss ss ps ss ss ss ss ss ss ss ss ss ss ss ss E I i ES 4 Bee MNS System Overview ABB s world wide competence is second to none this is possible due to the global MNS switchgear platform and local ABB manufac turing facilities ABB ensures conformance to IEC 60439 1 throughout these locations with a proprietary switchgear engineering tool This tool provides a comprehensive database with predefined engineering solutions for MNS This database is then utilized with minimal engineering effort to provide customer specific solutions thus meeting local specifications Where specific solutions are required on a global basis these can easily be deployed throughout the ABB manufacturing facilities network thus significantly reducing project lead times LW m m
9. erection Annex AA EP ED ABB Low Voltage Systems Local contacts www abb com mns Publication No 1 TGC902030B0201 Revision 01 May 2007 Editor ABB Automation Products GmbH Dept APR S RDB Wallstadter Str 59 D 68526 Ladenburg Germany
10. f an intelligent motor control system IMCS Micro processor protection monitoring and control of motor and distribution circuits nterfacing to host systems via fieldbus communications Integration into plant wide Control Systems Fieldbus Ethernet User Interface After Sales and Service Plant Availability Asset Monitoring Condition Monitoring Continuous Maintenance and Spares Holding Commissioning ABB s goal is to ensure the assets maximum performance and availability ABB has supplied over 1 2 million MNS cubicles from its world wide manufacturing locations Each of these locations operates with an After Sales and Service depart ment offering unparalleled global support On completion of commissioning the switch gear is at the peak of its performance To maintain this condition it is essential to adopt a service and maintenance plan for this asset If the switchgear does not receive maintenance this could result in downtime In production the availability of the switchgear ensures productivity and any down time is a lost opportunity for profit Down time can be attributed to the following maintenance practices Reactive maintenance is costly for both production and unplanned downtime Preventive or Continuous maintenance is usually performed on an annual basis during a scheduled shutdown By evaluating information from the intelligent switchgear it is possible to adopt a Pred
11. he available module types have typical characteristics as shown in the graphic above Where high process availability is essential and minimal time is required for module exchange the withdrawable solution has proved to be the definitive choice In installations where internal access to the switchgear does not present an obstacle the plug in option may be the practical solution Depending upon the choice of outgoing mod ules selected the skill set of the personnel required to operate and maintain the switch gear may also differ Switchgear requirements differ from project to project MNS easily allows the assembly to be configured to suit all plant operational proce dures Outgoing Modules e Outgoing Modules e mx illie Plug in Modules MNS offer numerous alternatives for plug in modules When utilizing the multifunction wall all modules have the ability to be exchanged without de energizing the switchgear should maintenance procedures allow The flexibility of the system allows power distribution and motor control to be offered in the most economical Form 2 solution From this as a basis options exist for internal exter nal operation and separation to Form 4 Slimline switch disconnector offers ABB s most compact form of fused energy distribu tion and is available in 3 or 4 pole options This design is available in standard modules sizes with a maximum rating
12. ictive maintenance schedule Utilizing an ABB expertise can help to increase the life cycle of the switchgear Proactive Predictive Preventive Maintenance Overhaul Reactive Maintenance Life Cycle Regular Services ABB offers comprehensive service and support during the whole life time of the switchgear Engineering assistance Product training Spares holding Installation and commissioning Service planning Hardware and software support Upgrades expansions and modifications Contract Services ABB can offer comprehensive maintenance contracts designed specifically for each particular process Through preventive maintenance programs unscheduled outages be reduced and maintenance workflows are streamlined Utilization of integrated switchgear enables the maintenance to be taken into an even pre dictive maintenance practice where information available from the switchgear can further assist with maintenance workflow After Sales and Service 28 Asset Monitoring with MNS 5 In a further step of improving maintenance practices ABB s MNS 15 platform is a fully self supervising switchgear that can eliminate costs for assets that do not require attention The asset monitor system evaluates all events alarms and trips for predictive maintenance planning and essential working issues The conditions are monitored and entered into groups electrical mechanical
13. ight Hecommended width Hecommended depth Basic grid size According to IEC 60529 Frame incl internal subdivisions Cladding internal Cladding external Frame incl internal subdivisions Cladding internal Cladding external Halogen free self extinguishing flame retardant CFC free Busbars Test certificates Enclosure 500 v 690 V 3 750 V Oy oy IZ up to 60 Hz up to 6800 A up to 250 upto 100 kA up to 2000 A up to 176 kA upto 100 kA 690 V 100 kA 300 ms Wes DIN 41488 2200 400 600 800 1000 1200 mm 400 600 800 1000 1200 29m dec to DIN 438660 External from IP 30 to IP 54 Internal from IP 2X 2 FRI Minimum 1 5 mm Minimum 2 0 mm Zinc or Alu zinc coated Zinc or Alu zinc coated Zinc or Alu zinc coated and Powder coated RAL 7035 light grey IEC 60707 DIN VDE 0304 part 3 Fully insulated with heat shrinkable sleeving oilver plating Tin plating See test certificates listed above opecial colours on request Definition TTA Switchgear assembly corresponding to a large degree with the original type or system of switchgear assembly type tested in accordance with these standards Depending on the electrical equipment Operational Safety and Availability Operational Safety and Availability The fulfilment of all instructions of IEC 60439 1 assures a basic level for personnel and system protection With MNS
14. ights Maintenance free bus bar construction Easy switchgear extension Main busbar arrangement at the rear thus assuring maximum safety to personnel effective withstand against highest stresses in case of short circuit optimum heat dissipation Gas tight seals for connection from the equipment compartment to the main busbar system Option for Form 4 separation for both incoming and outgoing assemblies Active and passive arc fault prevention tested according to IEC 61641 solating materials are free of CFC and halogens Multifunction Wall The multifunction wall MFW with the embed ded distribution bars is a unique MNS design It constitutes a complete barrier between the main busbars and the equipment compartment The distribution bars are fully phase segregated and insulated This design makes it virtually impossible for an arc to pass between distribu tion bar phases or between main busbars and equipment compartment The insulation material is CFC and halogen free it is also flame retardant and self extinguishing E ER a Switchgear Design EAS 05 E Ee a te E 1 Contact openings finger proof IP 2X so that personal safety is guaranteed even when modules are removed With the use of MNS specific power contact housings full single phase segregation is assured prior to the connection of the power contacts to the distribution bars Switchge
15. ing truck Configuration and test unit ACB withdrawable operation In a withdrawable solution the ACB assembly consists of two components the fixed part cassette and the moving part ACB This enables the ACB to be located in 3 positions CONNECTED The moving part is fully inserted into the fixed part with the connection of both the power terminals and the auxiliary contacts The circuit breaker is operational and the mechanical indicator shows CONNECTED TEST ISOLATED The moving part is inserted into the fixed part without the connection of the power terminals but with connection of the auxiliary terminals The circuit breaker may be operated for offline tests The mechanical indicator shows TEST ISOLATED DISCONNECTED The moving part 15 inserted into the fixed part without any connection of the power and auxiliary terminals In this position all electrical operation of the ACB is prevented The mechanical indicator shows DISCONNECTED The switchgear compart ment door can remain closed therefore not compromising the IP rating of the switchgear The ACB cassette fixed part has shutters which are positively driven closed during the racking out process to prevent the possibility of contact with live parts Integration into plant wide Control Systems System Connectivity Aspects ABB s structure with respect to offering site wide information is that a field bus connection for process contro
16. l information and switching commands is utilized An additional interface Process which is typically Ethernet is used to support Control functions such as parameterization data distribution to electrical SCADA and or asset optimization systems This configuration is also continued through the ABB medium voltage product portfolio Configuring the structure as detailed above ensures that the critical process data path is not compromised by also being utilized for parameterization and additional data required for engineering and maintenance With the introduction of MNS ABB has been providing market leading low voltage switch gear systems technology In 1987 ABB installed the world s first intelligent low voltage motor control center since then ABB has delivered over 80 000 intelligent motor controllers In 2005 MNS S the world s first integrated low voltage switchgear platform was launched MNS 1 5 defines the next benchmark in low volt age switchgear providing the following features Improved personnel safety through a unique design Lower life cycle cost from a totally scalable system Worlds first standardised motor controller and Rss __ feeder modules World first self supervising switchgear by the use of asset monitoring Future proof utilizing ABB s patented inter facing technology Asset MNS 5 platform offers in addition to the Monitoring above the basic characteristics o
17. m Sa I VL Um ei 1 Mm m ss Wm lt Ws 8 1 N Ug B i Standards Test certificates Electrical data Mechanical characteristics Optional Extras available on request Technical Data Rated voltages Rated current Arc Fault Containment Forms of separation Dimensions Degrees of Protection Steel components Surface protection Paint Plastic components Busbar system opecial qualification Paint Type tested switchgear assemblies T TA IEC 60439 1 CEI 60439 1 DIN EN 60439 1 VDE 0660 part 500 UTE 63 412 ASTA Great Britain resist to accidental arcs acc to IEC 61641 and IEC 60298 Appendix AA DLR German Research Institute for Aerospace e V J lich Earthquake Test for Security Areas in Nuclear Power Stations IABG Industrieanlagen Betriebsgesellschaft Vibration and shock tests Complying with Germanischer Lloyd Hamburg Rated insulation voltage U Rated operating voltage U Rated impulse withstand voltage Uimp Overvoltage category Degree of pollution Rated frequency Copper Busbars Rated current le Rated peak withstand current lpk Rated short time withstand current lcw Copper Distribution bars Rated current le Rated peak withstand current lpk Rated short time withstand current lcw Hated operational voltage Prospective short circuit current Duration Criteria Cubicles and frames Hecommended he
18. mpartment is then located behind the door in the lower sub section For bottom entry the configuration IS Vice versa Busbar compartment Contains the MNS main busbar system Connection to the main bus is via a Partition Plate with gas sealed connections Outgoing solution Equipment compartment equipment including the motor starter modules in withdrawable design is situated therein The compartment can be divided into horizontal and vertical sub compartments Cable compartment Contains control cables and terminals as well as power cables and connection units Cable entry may be top or bottom Busbar compartment Contains the MNS main busbar system The distribution bars are embedded in the multifunction wall MFW which is located between the equipment compartment and the busbar compartment Withdrawable solutions only Switchgear Design Switchboard Arrangements MNS cubicles can be arranged as follows free standing back to back or duplex Switchboard Dimensions MNS cubicles have the following representative dimensions 2200 mm Switchgear Design Mechanical Design 8 LU a i a LN a d 4 a L i LI 1 kee ee amp E 5 E iii Ses E T mmm mm e mm e ana ar d re Frame construction The basic elements of the MNS frame construction are C
19. nd personnel safety assured by MNS such as Basic safety philosophy tested switchgear assembly Arc fault protection Degrees of protection IP code nternal separation Earthquake vibration and shock Neutral conductor dimensioning ASTA Tost Report Ho 1197 gen Bei Rn P AZT Cheval Pad Hopes ZIL Eege AFP LU Tiem tame d reet hate Drs rues gb ada Des tue hb D bispe Beet MERPATI Menn WF eT Ls AER Geert ete Di gan Freen ETS ben ien aea Hrsg Tra SS Te E r as Leg IPH rena Sand dee CATES OF FEST 4 em DLE Tum bam Free EIER niat PG 8 m 8 4 1 REPORT hen LEKT Rd Eremi h phs basmi i iaiia 4 i E WC 8 ITE of gta aue il ex SOCOM Gef DEA nert resi Brong erum s rei EE bows ad qe rey 207248 pair ga res a hiara cire This cec cumin i of m ng tin of aie een ced Fr n cies eee eben eat Sy Geer pf Ei Ierger zap del ze Es cf ben epes by on ie eS nor ER at Tha
20. ocal customers This together with the global service and support network established in over 30 manufacturing locations world wide ensures that the choice of MNS will be the right decision Hofors Power Station and Rolling Mill 1890 Sweden Hospital Zoetermeer Netherlands 6 m m Te fa Ze Y wi ES um Features amp Applications The ABB MNS system is a type tested switchgear assembly TTA in accordance with IEC 60439 1 The consistent application of the modular prin ciple both in electrical and mechanical design as well as the use of standardized components allows its flexible and compact design Depending on operating and environmental conditions different design levels are available Notable system advantages with regard to design aspects Optimum protection for personnel and plant Fully type tested including internal arc fault containment High operational reliability and availability Earthquake vibration and shock proof designs are available Maintenance free busbar and frame construction s Simple retrofitting procedures Compact space saving design Simplified project implementation utilizing ABB s dedicated engineering tool Thus MNS proves to have the approved solution for the following industries Oil amp Gas on and off shore Chemical Petrochemical Pharmaceutical Power Stations Paper Water treatm
21. odules are available ranging from 4E to 48E in physical sizes The construction of the full modules differs slightly from that of the small modules in utilizing a full width hinged door which is mechanically interlocked to the isolator All operational procedures for the modules are possible without the need to open the door of the module Outgoing Modules Full width modules connect directly to the distribution bars through the multifunction wall The design of the module enables auxiliary components to be located on both the vertical and horizontal mounting plates within the module thus optimizing the available space usage within the module Cable connections for main and auxiliary circuits are accessible from the cable compartment 25 N Outgoing Modules Module operation MNS modules are operated with the multifunction operating handle This handle also activates the electrical and mechanical interlocking of the module and the module door No further tools or unlocking devices are necessary to withdraw a module thus replacing a module takes less than a minute Replacement as well as retrofit ting of modules can be performed under live conditions should plant operating procedures allow Outgoing Modules e Withdrawable module positions TEST Module is inserted main switch open main circuit disconnected control circuit All main and auxiliary connections are self connected padlocking
22. of 630 A Operation is performed via the handle on the front of the module which has an inbullt padlocking facility and mechanical open closed indication The following options are available Ammeter Auxiliary contacts Fuse blown indication Slimline is also available as Intelligent Tier owitch enabling the following information to be sent via its fieldbus connection Switch status Fuse indication Current Voltage Power amp Power Consumption Power factor Temperature Plug in Modules AC Industrial Drives Due to its inherent modular design MNS can easily be adapted to house the ABB range of AC Industrial Drives The switchgear can accommodate multiple drives in a single section Each drive compartment has an individual isolator options are available for filters to be installed and for the drive control panel to be door mounted to enable interrogation and parameterization without the need to open the door ABE Outgoing Modules Full size cubicles are also available for the AC Industrial Drives solution These are however of a fixed technique enabling MNS to offer a complete range of drives all supplied from a common AC bus Reactive Power Compensation MNS also offers the possibility of integrating reactive power compensation modules into its standard design thus reducing the require ments for additional external cubicles The modular design offers highest flexibility
23. on Incoming options Further options available but not limited to All ACBs have as a minimum the following Zone selectivity features Dual protection settings Manual charging lever and Charged indication Directional short circuit protection Manual Open Close push buttons Reverse power Mechanical Open Closed indication Under overvoltage protection Mechanical signalling of Overcurrent release Annunciation of measured values alarms 4 auxiliary contacts Maintenance data Integration into a plant wide process control Project Specific Options system refer to page 28 Gas sealed connections to the main busbars separation wall In addition to the above ABB circuit breakers 3 or 4 pole solutions offer a series of integrated programmable Withdrawable fixed configuration releases PRs where combinations of or bottom cable entry bus duct protection functions maybe selected with 50 or 100 neutral Overload protection L Shunt opening closing release Selective short circuit protection S Undervoltage release Instantaneous short circuit protection Electrical signalisation of ACB status Earthfault protection G Key locking facilities Shutter locking facilities Mechanical indication Racked In Racked Out Test Isolated position Locking in Racked In Racked Out Test Isolated position Switch disconnector option ACB handl
24. possible locating without the need of additional tools ISOLATED Module is withdrawn 30 mm from ON Module is inserted main switch closed the inserted position main switch open main main and control circuit connected and control circuit disconnected padlocking possible OFF Module is inserted main switch open main and control circuit disconnected padlocking MOVE Module may be completely withdrawn possible from the switchgear All positions situations are clearly marked on the fixed section of the operation handle in accordance with IEC 60439 1 System Highlights High stacking density resulting in a reduced footprint Complete phase isolation of main power contact prior to connection to the distribution bars Full module functionality with external operation Module replacement possible in less than 1 minute no tools required Incoming Solutions All of the MNS incoming solutions are fully In order to satisfy all requirements there are type tested in accordance with IEC 60439 1 three main switch incoming options in addition to IEC 60947 1 required for the Load break switches individual apparatus and engineered to meet Moulded case circuit breakers MCCBs the requirements of IEC 61641 This ensures Air circuit breakers ACBs offering of Proven Safety Plus for operators and plant Please refer to the technical reference section of this document for a list of related documentati
25. system is a maintenance free con struction as a result of utilizing thread locking ESLOK screws together with conical spring washers This technology remains relatively unchanged since the introduction of MNS and has been extensively supplied into the most demanding industries The busbar system and all associated parts are manufactured from copper in accordance with DIN 40500 Options are available for silver plating and or a fully insulated solution utilizing heat shrinkable sleeving Switchgear Design eim I 3 B i 8 UN 1 1 I mmm al j I j 3l E E SL E c Protective Earth and Neutral Bars neutral conductor can be arranged within the busbar compartment running in parallel with the As a standard protective earth and neutral main busbars bars run horizontally within the front of the switchboard just above the base The PE bar is fastened to the frame to assure electrical Distribution bars continuity Inside the cable compartment they run vertically located on the front right hand A fully phase segregated and encapsulated side of the compartment 3 4 pole distribution bar system runs the full height of the cubicle The distribution bars are For applications where a 5096 or 10096 neutral silver plated as standard size is required due to unbalance or harmonic distortion as well as for 4 pole switching the System Highl
26. to adjust the compensation power to changes of the load connected to the network The standard range covers Network voltages up to 690 V 50 or 60 Hz common reactor rates if reactor required Modules up to 50 kVar Controllers available for 6 or 12 step options e Outgoing Modules Withdrawable Modules The withdrawable technique has proved to be the appropriate solution for use in industrial applications where requirements for high availability are a must particularly in Motor Control Centers MCC Modules can be easily exchanged under operational conditions thus assuring maximum flexibility Small modules Withdrawable technique is distinguished by its compact design where with the smallest 8E 4 module it is possible to physically define a maximum of 36 modules in the equipment compartment This modularity enables the assembly to maximize the usage of the available space which in turn reduces the overall foot print of the switchgear The condaptor unit enables the horizontal distribution of power from the vertical distribution bars this allows 2 modules 8E 2 or 4 modules 8 4 to be located adjacently within the same horizontal position in the cubicle Condaptors are available in 3 or 4 pole options Cable connections for main and auxiliary circuits are integrated into the condaptor and are accessible from the cable compartment Full width modules These m
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