Medium-Voltage Switchgear - Siemens CN

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Medium-Voltage SwitchgearType NXPLUS C Fixed-Mounted Circuit-Breaker Switchgear up to 24 kV, ExtendableSingle Busbar, Metal-Enclosed, Gas-InsulatedMedium-VoltageSwitchgearINSTALLATION ANDOPERATINGINSTRUCTIONSOrder No.: 802-9081.9Revision: 02Issue: 24.10.2008

About these InstructionsThese instructions do not purport to cover all details orvariations in equipment, nor to provide for everypossible contingency to be met in connectionwith installation or operation.For details about technical design and equipment likee.g. technical data, secondary equipment, circuitdiagrams, please refer to the order documents.The switchgear is subject to continuous technicaldevelopment within the scope of technicalprogress. If not stated otherwise on the individualpages of these instructions, we reserve the rightto modify the specified values and drawings. Alldimensions are given in mm.2For further details, e.g. about additional equipment,please refer to catalog HA 35.41.Should further information be desired or shouldparticular problems arise which are not coveredsufficently by these instructions, the mattershould be referred to the competent Siemensdepartment.The contents of this instruction manual shall not becomepart or modify any prior or existing agreement,commitment or relationship. The Sales Contractcontains the entire obligations of Siemens. Thewarranty contained in the contract between theparties is the sole warranty of Siemens. Anystatements contained herein do not create newwarranties or modify the existing warrantyRevision 02 * INSTALLATION AND OPERATING INSTRUCTIONS NXPLUSC * 802-9081.9

ContentsSafety instructions.59.11Three-position switch-disconnector forswitch-disconnector panels, ring-main panels andcircuit-breaker panels up to 630 A, contactor paneland metering panel . 711Signal terms and definitions. 52General instructions . 53Due application. 79.12Endurance classes . 684Qualified personnel . 79.13Vacuum contactor .69Description.810End of service life .695Features . 8Installation . 706Panel types.1011Constructional stipulations.707Examples for panel versions . 1111.1Switchgear room.708Components.1511.2Constructional data, foundation . 748.1Circuit-breaker .1511.3Transport units of NXPLUS C.878.2Vacuum contactor .1712Before installation .898.3Three-position disconnector .1812.1Preliminary clarifications .898.4Three-position switch-disconnector .1912.2 Intermediate storage.908.5Operating mechanisms for three-positiondisconnector/switch-disconnector. 2412.3 Tools/auxiliary means .918.64MT voltage transformers . 228.74MC current transformers. 248.8HV HRC fuse assembly. 258.9Busbar system . 278.10Cable connection. 278.11Ready-for-service indicator . 398.12Interlocks. 4013.4 Transport to the place of installation (switchgearroom) .948.13Voltage detecting systems . 4113.5 Checking the ready-for-service indicator . 978.14Accessories. 4414Assembling the switchgear .999Technical data. 4714.1Bolting panels together. 999.1Complete switchgear . 4714.2 Fastening the switchgear to the foundation. 1019.2Classification of NXPLUS C according toIEC 62 271-200 . 5414.3 Assembling the busbars . 1029.3Standards, specifications, guidelines . 5014.4 31.5 kA version: Mounting the busbarsupport . 1169.4Selection of HV HRC fuse-links . 5214.5 Installing busbar current transformers . 1139.5Transformer protection table (with HV HRC fusesmake SIBA). 5314.6 Installing busbar voltage transformers . 1149.6Motor protection table (with HV HRC fuses makeSIBA) . 619.7Fuse protection table for metering panel (with HVHRC fuses make SIBA) . 6212.4 Installation and fixing material.9112.5 Comments on electromagnetic compatibility .9113Switchgear, unloading and erecting . 9313.1Packing and transport unit .9313.2 Completeness and transport damages.9313.3 Unloading transport units.9414.7 Installing the earthing busbar.11714.8 Switchgear earthing . 11814.9 Low-voltage compartments, installation . 11914.10 Busbar covers . 1199.8Rating plates . 6314.11 Installing the end walls . 1229.9Vacuum circuit-breaker . 6414.12 Extension with individual panels. 1239.10Three-position disconnector for circuit-breaker,disconnector and bus sectionalizerpanels 1000 A .7115Electrical connections . 12415.1Connecting cable T-plugs . 124802-9081.9 * INSTALLATION AND OPERATING INSTRUCTIONS NXPLUSC * Revision 023

21.1Closing the three-position switch.16421.2Opening the three-position switch .16521.3Earthing/ready-to-earth with the three-positionswitch.16615.5 Connecting auxiliary circuits . 13221.4De-earthing with the three-position switch .16716Installation of degree of protection versionsIP31D, IP32D and IP34D. 13821.5Operating the three-position switch with motoroperating mechanism.16716.1IP31D - protection against vertically falling waterdrops . 13821.6Three-position switch-disconnector with springoperated/stored-energy mechanism .16816.2 IP32D - protection against vertically fallingwater drops when the switchgear is inclinedby 15 . 14821.7Emergency operation of the three-position switchwith slow motion mechanism (900 mm panelwidth) .16816.3 IP34D - protection against splashing water fromany direction . 14622Verification of safe isolation from supply. 17423Replacing HV HRC fuse-links .17524Operating the voltage transformerdisconnector.18315.2 Panels 2000 A, 2500 A with doubleconnections . 13315.3 Connecting surge arresters . 13115.4 Surge limiters, connection. 13117Commissioning. 14717.1Final work . 14717.2Checking the accessories . 15017.3Instructing operating personnel . 15217.4Function test / Test operation . 15224.2 Closing the voltage transformerdisconnector.18417.5Performing the power- frequency voltagetest . 1592517.6Primary injection test. 15617.7Applying operational voltage (high voltage) . 156Operation . 15818Control elements . 15819Checking the ready-for-service indicator . 15920Circuit-breaker operation . 16020.1 Closing the circuit-breaker manually . 16020.2 Opening the circuit-breaker manually . 16020.3 Test operation without auxiliary voltage. 16120.4 Test operation with auxiliary voltage (motoroperating mechanism) . 16220.5 Charging the closing spring manually . 16221Three-position switch operation . 16324.1 Opening the voltage transformerdisconnector.183Short instructions .18125.1 Operating circuit-breaker panels.18425.2 Operating vacuum contactor panels .19525.3 Operating switch-disconnector, disconnector, ringmain and metering panels.19825.4 Operating bus sectionalizer panels . 20225.5 Operating bus sectionalizers with two threeposition disconnectors . 20925.6 Operating circuit-breaker panel with busbarearthing switch. 22426Cable testing . 23127Maintenance . 23327.1Maintenance . 23327.2Switchgear extension and replacement of panelsand components . 233Index . 2344Revision 02 * INSTALLATION AND OPERATING INSTRUCTIONS NXPLUSC * 802-9081.9

Safety instructionsSafety instructions1Signal terms and definitionsDANGER!as used in these instructions, this means that personal injuries can occur if the relevantprecautionary measures are not taken.Ö Observe the safety instructions.ATTENTION!as used in these instructions, this means that damage to property or environment canoccur if the relevant precautionary measures are not taken.Ö Observe the safety instructions.NOTE!as used in these instructions, this points at facilitations of work, particularities foroperation or possible maloperation.Ö Observe the notes.Symbols usedÖ Operation symbol: Identifies an operation. Asks the operator to perform anoperation.r Result symbol: Identifies the result of an operation.2General instructionsIndependently of the safety instructions given in these operating instructions, the locallaws, ordinances, guidelines and standards for operation of electrical equipment as wellas for labor, health and environmental protection apply.Five Safety Rules ofElectrical EngineeringThe Five Safety Rules of Electrical Engineering must generally be observed duringoperation of the products and components described in these operating instructions: Isolating. Securing against reclosing. Verifying safe isolation from supply. Earthing and short-circuiting. Covering or barriering adjacent live parts.802-9081.9 * INSTALLATION AND OPERATING INSTRUCTIONS NXPLUSC * Revision 025

Safety instructionsPrescribed work protectionclothingTo select the work protection clothing, the national standards and specifications of thecorresponding authorities and professional associations must absolutely be observed.The following information provides basic instructions.To work in electrical switchgear, protective equipment against arc faults must be used toavoid serious burns.The protective equipment consists of: Protective clothing Gloves Helmet and face protectionFig. 1:Protective clothingPrescribed work protection clothingJacket and overalls made of double-layer material providing a protective effect againstelectric arcs (e.g. Nomex Comfort); if applicable, additional polo shirt made of thesame material.Underwear only made of cotton or also Nomex .GlovesGloves with gauntlets, the material of which must feature a dielectric strength of 1000 Vas a minimum.HelmetHelmet in closed design (without ventilation holes), consisting of glass-fiber polyesterresin (not dripping under thermal effects), holding its shape up to 500 Celsius as aminimum.Face protectionA face vizor made of clear acetate with a minimum thickness of 1.5 mm, protectingagainst arc faults.It should be possible to attach the face vizor to the helmet so that it can be folded.6Revision 02 * INSTALLATION AND OPERATING INSTRUCTIONS NXPLUSC * 802-9081.9

Safety instructions3Due applicationThe switchgear corresponds to the relevant laws, prescriptions and standards applicableat the time of delivery. If correctly used, they provide a high degree of safety by meansof logical mechanical interlocks and shockproof metal enclosure of live parts.DANGER!The perfect and safe operation of this switchgear is conditional on:Ö Observance of operating and installation instructions.Ö Qualified personnel.Ö Proper transportation and correct storage of the switchgear.Ö Correct installation and commissioning.Ö Diligent operation and maintenance.Ö Observance of the instructions applicable at site for installation, operation andsafety.4Qualified personnelQualified personnel in accordance with these instructions are persons instructed by theSwitchgear Factory Frankfurt who are familiar with transport, installation,commissioning, maintenance and operation of the product and have appropriatequalifications for their work, e.g: Training and instruction or authorization to switch on, switch off, earth and identifypower circuits and equipment / systems as per the relevant safety standards. Training regarding the applicble specifications for the prevention of accidents and theuse of appropriate safety equipment. Training in first aid and behavior in the event of possible accidents.802-9081.9 * INSTALLATION AND OPERATING INSTRUCTIONS NXPLUSC * Revision 027

DescriptionDescription5Typical usesFeaturesExtendable fixed-mounted circuit-breaker switchgear NXPLUS C, single busbar, is usedin transformer and distribution substations as well as for switching duties in industrialplants.The panels are designed for rated voltages up to 24 kV and rated currents up to 2500 A.In distribution systems up to 24 kV (15 kV), a maximum short-circuit current of 25 kA(31.5 kA) is permissible.Insulating gas SF6Sulphur hexafluoride is used as insulating gas. SF6 insulates live parts between eachother and against the vessel wall. In panels with switch-disconnectors, SF6 is also usedfor arc quenching.The switchgear is delivered ex works with SF6 filling, ready for service. The SF6 filling isprovided to last the total service life of the switchgear.No gas work is required for installation at site and later extensions.Filling quantity as per rating plate.Technology Factory-assembled, type-tested and metal-enclosed switchgear for indoor installation Stainless-steel vessel welded gas-tight Switching device compartment gas-insulated Single-pole insulated: cable connection and busbar Installation and extension without SF6 gas work Screened busbar system, insulated with silicone rubber Cable connection from front with cable plugs Maintenance-freePersonal safety Safe-to-touch due to metal enclosure of live parts Clear mimic diagram with mechanical position indicators HV HRC fuses and cable sealing ends are only accessible when outgoing feeders areearthed (option) Operation is only possible when the enclosure is closed (only for panels with HV HRCfuses) Logical mechanical interlocking Capacitive voltage detecting system to verify safe isolation from supply Earthing of outgoing feeders by means of make-proof earthing switch Resistance to internal arcing- Pressure-resistant design of connection compartments- Pressure relief duct at the rear (for free-standing arrangement)8Revision 02 * INSTALLATION AND OPERATING INSTRUCTIONS NXPLUSC * 802-9081.9

DescriptionSecurity of operation andavailability Hermetically sealed primary enclosure independent of environmental effects such aspollution, humidity and small animals Welded switchgear vessel, sealed for life Operating mechanisms of switching devices accessible outside the switchgear vessel Maloperation is practically excluded due to interlocks and logical arrangement ofoperating elements. Ready-for-service indicator self-monitoring, easy to read, independent of temperatureand environmental pressure variations, with contactless measured-value acquisitionand with signaling contacts (option) 1NO 1NC for telecommunication. Minimum fire load Switchgear vessel designed as "sealed pressure system" according to IEC 62 271-200,i.e. the insulating gas filling requires no maintenance.Cost-efficiencyExtremely low "life-cycle costs" and maximum availability thanks to: Maintenance-free design (for the service life) Climatic independence Minimum space requirements Long service lifeType approvalNXPLUS C switchgear has been type-approved by the following classification societies: Lloyds Register of Shipping (LRS) Det Norske Veritas (DNV) German Lloyd (GL)The switchgear is therefore also approved for application on ships and platforms.Aseismic capacity (option)NXPLUS C switchgear can be upgraded for regions at risk from earthquakes. Forupgrading, earthquake qualification testing has been carried out in accordance with thefollowing standards: IEC 68-3-3, 1993 IEC 68-2-6, 1995 IABG TA13-TM-002/98 (guide)Within the range of the prevailing earthquake frequencies from 1 Hz to 35 Hz, thecategory 1 required response spectrum to IABG TA13-TM-002/98 covers the followingresponse spectra: Uniform Building Code zone 3 Seismic Requirements Spec. 9067; Department of Water&Power, Los Angeles GTS – 1.013 ENDESA, Chile IEC 61 166802-9081.9 * INSTALLATION AND OPERATING INSTRUCTIONS NXPLUSC * Revision 029

Description6Circuit-breaker panelMetering panel10Panel typesDisconnector panelSwitch-disconnector panelContactor panelVacuum circuitbreakerThree-position switchdisconnectorCurrenttransformerVoltage transformerHV HRC fuseVacuum contactorBus sectionalizerRing-main panel---------------Three-position disconnectorCapacitive voltagedetecting systemThese components can beconnected partly or optionallyCable (not included in thescope of supply)Revision 02 * INSTALLATION AND OPERATING INSTRUCTIONS NXPLUSC * 802-9081.9

Description7Fig. 2:Examples for panel versionsCircuit-breaker panel (630 A)*asdfLow-voltage compartmentghjkl;ACable compartment coverSIPROTEC bay controller (option)Operating frontCapacitive voltage detecting system (busbar: left side, cable feeder:right side)Cable with cable plug for outside-cone plug-in systemVoltage transformer (option)Voltage transformer disconnector (option)Ring-core current transformer (option)Circuit-breaker with vacuum interruptersSwitchgear vessel, hermetically welded, filled with SF6 gas, withbursting discSDFGThree-position switch-disconnector*Shown without air guides in the cable compartmentBusbar systemPressure relief ductBusbar voltage transformer (option)Fig. 3:Circuit-breaker panel (1250 A)*asdfLow-voltage compartmentghjkl;ACable compartment coverSDFGThree-position disconnectorSIPROTEC bay controller (option)Operating frontCapacitive voltage detecting system (busbar: left side, cable feeder:right side)Cable with cable plug for outside-cone plug-in systemVoltage transformer (option)Voltage transformer disconnector (option)Ring-core current transformer (option)Circuit-breaker with vacuum interruptersSwitchgear vessel, hermetically welded, filled with SF6 gas, withbursting discBusbar systemPressure relief duct (option wall-standing arrangement)Busbar voltage transformer (option)802-9081.9 * INSTALLATION AND OPERATING INSTRUCTIONS NXPLUSC * Revision 0211

DescriptionFig. 4:Circuit-breaker panel 900 mm panel ( 2000 A, 2500 A ) Fig. 5:asdfghjLow-voltage compartmentkl;AVoltage transformer disconnector (option)SIPROTEC bay controller (option)Operating frontCapacitive voltage detecting systemCable compartment covers*Cable with cable plug for outside-cone plug-in systemVoltage transformer (option)Ring-core current transformer (option)Circuit-breaker with vacuum interruptersasdfghjBus sectionalizer (1250 A)Low-voltage compartmentSIPROTEC bay controller (option)Operating frontCapacitive voltage detecting systemCoverCircuit-breaker with vacuum interruptersSwitchgear vessel, hermetically welded, filled with SF6 gas, with burstingdisck Three-position disconnectorl Busbar system; Pressure relief duct (option for wall-standing arrangement)Switchgear vessel, hermetically welded, filled with SF6 gas, with burstingdiscS Three-position disconnectorD Twin busbar system (2500 A)F Pressure relief duct12Revision 02 * INSTALLATION AND OPERATING INSTRUCTIONS NXPLUSC * 802-9081.9

DescriptionFig. 6:asdfBus sectionalizer, 900 mm panel ( 2000 A, 2500 A )* Fig. 7:Low-voltage compartmentSIPROTEC bay controller (option)Operating frontCapacitive voltage detecting system (busbar: left side, cable feeder:right side)g Cable compartment coversh Circuit-breaker with vacuum interruptersj Switchgear vessel, hermetically welded, filled with SF6 gas, withasdfContactor panel with fuses**Low-voltage compartmentSIPROTEC bay controller (option)Operating frontCapacitive voltage detecting system (busbar: left side, cable feeder: rightside)g Cable compartment coverh Cable with cable plug for outside-cone plug-in systemj Ring-core current transformer (option)bursting disck Three-position disconnectorl Twin busbar system (2500 A); Pressure relief duct (option for wall-standing arrangement)k HV HRC fuses in the fuse assemblyl Contactor with vacuum interrupters; Switchgear vessel, hermetically welded, filled with SF6 gas, with burstingdiscAS Busbar systemD Pressure relief duct (option for wall-standing arrangement)F Busbar voltage transformer (option)Three-position switch-disconnector*only for 2500 A cable compartment cover with ventilation**Shown without air guides in the cable compartment802-9081.9 * INSTALLATION AND OPERATING INSTRUCTIONS NXPLUSC * Revision 0213

DescriptionFig. 8:Switch-disconnector panel with fuses*as SIPROTEC bay controller (option)d Operating frontf Capacitive voltage detecting system (busbar: left side, cable feeder:Low-voltage compartmentright side)ghjklCable compartment coverCable with cable plug for outside-cone plug-in systemRing-core current transformer (option)HV HRC fuses in the fuse assemblySwitchgear vessel, hermetically welded, filled with SF6 gas, withbursting disc;ASDThree-position switch-disconnector*Shown without air guides in the cable compartment14Busbar systemPressure relief duct (option for wall-standing arrangement)Busbar voltage transformer (option)Revision 02 * INSTALLATION AND OPERATING INSTRUCTIONS NXPLUSC * 802-9081.9

Description88.1DesignComponentsCircuit-breakerThe Siemens vacuum circuit-breaker 3AH55 is a three-pole indoor circuit-breaker forrated voltages from 7.2 kV to 24 kV.The circuit-breaker consists of the following components: Operating mechanism with stored-energy spring mechanism and control elements Three circuit-breaker poles with vacuum interrupters Partition plate Operating rods for contact operation, mounted in the vessel front (partition plate) in amovable way and without seals by means of welded-in metal bellows.Fig. 9:asdfgAuxiliary switch (S1)hj1st release (Y1)kl;Operations counterASDPosition switch (S4)FControl board for three-positionswitchOperation for ON pushbuttonOperation for OFF pushbuttonSockets for voltage indicators"Feeder earthed“ lockingdevicePosition indicator for circuitbreakerClosing solenoid (Y9)"Spring charged/spring notcharged" indicatorClosing springGear with motor (M1)Circuit-breaker operating mechanismThe operating mechanism box accommodates all electrical and mechanical componentsrequired for closing and opening the circuit-breaker.3AH55 circuit-breakers need no opening spring, as the contact pressure springs have anopening effect in this pole version.The operating mechanism box is closed with a removable cover. The cover containsopenings for the control elements and indicators.The circuit-breaker is closed by pressing the ON pushbutton. The movementtransmission to the circuit-breaker poles is performed by metal bellows. The motorrecharges the closing spring immediately after.If the motor supply voltage fails, the closing spring can be charged manually. To do this,there is an opening in the cover with the hand crank coupling of the gear behind. Thecharging condition of the spring can be read on the indicator.The operations counter shows the number of charging processes.802-9081.9 * INSTALLATION AND OPERATING INSTRUCTIONS NXPLUSC * Revision 0215

DescriptionVacuum interruptersThe vacuum interrupter is fixed at the interrupter support. The fixed contact is directlyconnected to the housing. The moving contact is firmly connected to the connection boltand is centrally aligned in the guide. A metal bellows forms the vacuum-tight connectionto the interrupter housing.Fig. 10: Vacuum interrupterEquipmentThe basic version of the vacuum circuit-breaker is equipped as follows: Electrical operating mechanism (charging motor) with mechanical and electrical antipumping device (M1) Closing solenoid (Y9) Shunt release (Y1) Low-voltage plug connector with 10-pole wiring (Q0) Auxiliary switch 4NO 4NC or 3NO 4NC freely available (S1) Position switch for "closing spring charged" indication (S41, S42) Circuit-breaker tripping signal, cutout switches (S6, S7) Operations counter Feeder locking deviceAdditional equipment Extended auxiliary switch 10NO 6NC or 9NO 6NC freely available (S1) Shunt release (Y2) Undervoltage release (Y7) C.t-operated releases (Y4) Low-energy c.t-operated release (Y6) Interlocking between feeder locking device and three-position disconnector (circuitbreaker only lockable in earthed position) Interlocking between feeder locking device, three-position disconnector and cablecompartment cover (circuit-breaker only lockable in earthed position, cablecompartment cover only removable in earthed position)16Revision 02 * INSTALLATION AND OPERATING INSTRUCTIONS NXPLUSC * 802-9081.9

DescriptionPossible releasecombinationsReleaseRelease combination11st shunt releaseType 3AY15102nd shunt releaseC.t.-operated releaseUndervoltage releaseType 3AX1103234X5XX–XType 3AX1101–X–––Type 3AX1102; 0.5 A or––XX–––––XType 3AX1104; 0.1 WsX: 1 no. of each release. A maximum of 2 releases can be combined only.8.2DesignVacuum contactorThe Siemens high-voltage vacuum contactor 3TL72, 3TL73 and 3TL74 is a three-poleindoor contactor for rated voltages from 7.2 kV to 24 kV. The vacuum contactor can becontrolled from remote and has an electromagnetic operating mechanism suitable forhigh switching rates and unlimited operating time. The electromagnetic operatingmechanism is suitable for AC or DC operation.The vacuum contactor consists of the following components: Operating mechanism with magnetic drive and control elements Three contactor poles with vacuum interrupters Partition plate Operating rods for contact operation, mounted in the vessel front (mounting plate) in amovable way and without seals by means of welded-in metal bellows.The operating mechanism box accommodates all electrical and mechanical componentsrequired for closing and opening the contactor.The vacuum contactor has opening springs to ensure that the contactor switches off ifthe supply voltage fails.EquipmentThe basic version of the contactor is equipped as follows: Electromagnetic operating mechanism for unlimited operating time Auxiliary switch 3NO 4NC freely available for customerOptional Extended auxiliary switch 5NO 6NC freely available for customer802-9081.9 * INSTALLATION AND OPERATING INSTRUCTIONS NXPLUSC * Revision 0217

Description8.3Three-position disconnectorThe three-position disconnector combines the functions DISCONNECTING and READYTO-EARTH.Application: Circuit-breaker panel 1000 A to 2500 A Disconnector panel 1000 A to 2500 A Bus sectionalizer 1000 A to 2500 AIn circuit-breaker panels, earthing and short-circuiting the cable connection is completedby closing the circuit-breaker.FeaturesEquipment Operation via metal bellows or rotary bushings welded without seals into the front ofthe switchgea

Medium-Voltage Switchgear Type NXPLUS C Fixed-Mounted Circuit-Breaker Switchgear up to 24 kV, Extendable Single Busbar, Metal-Enclosed, Gas-Insulated Medium-Voltage Switchgear INSTALLATION AND OPERATING INSTRUCT

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instruction method where learners of different levels form small groups and work together towards a specific objective. Learners take the responsibility of their own learning and of those in the group so the success of one member is a success of all members. Piaget (1932, in Webb, 2009: 3) argues that cognitive conflict leads to higher levels of reasoning and learning. When a student notices a .