Power Xpert XGIS Gas-insulated Medium-voltage Switchgear .
Design Guide DG022020ENEffective April 2020Medium-voltage power distribution and control systems XGIS Power Xpert XGISContentsGeneral Description. . . . . . . . . . . . . . . . . . . . . . . . . . . .General Description. . . . . . . . . . . . . . . . . . . . . . . . . . .Application Description . . . . . . . . . . . . . . . . . . . . . . . .Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Standards and Certifications . . . . . . . . . . . . . . . . . . . .Features and Benefits . . . . . . . . . . . . . . . . . . . . . . . . .12.1-212.1-212.1-212.1-212.1-212.1-2Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Switchgear Construction . . . . . . . . . . . . . . . . . . . . . . .Circuit Breaker. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Cable Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . .Three-Position Disconnect Switch. . . . . . . . . . . . . . . .Voltage Transformers . . . . . . . . . . . . . . . . . . . . . . . . . .Current Transformers. . . . . . . . . . . . . . . . . . . . . . . . . s and Dimensions . . . . . . . . . . . . . . . . . . . . . . . 12.1-12Sample Layouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.1-12Installation Requirements . . . . . . . . . . . . . . . . . . . . . . 12.1-19Application Details . . . . . . . . . . . . . . . . . . . . . . . . . . . .Heat Loss. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Control Power Requirements. . . . . . . . . . . . . . . . . . . .XGIS Sample Schematics. . . . . . . . . . . . . . . . . . . . . . .12.1-2012.1-2012.1-2012.1-2012.1-21More about this productEaton.com/XGISComplete library of design guidesEaton.com/designguides
Design Guide DG022020ENPower Xpert XGIS General DescriptionGeneral DescriptionEffective April 202012.1-2Application DescriptionFeatures and BenefitsEaton’s XGIS metal-enclosed switchgearprovides centralized control and protectionof medium-voltage power equipment andcircuits in industrial, commercial andutility installations involving generators,motors, feeder circuits, and transmissionand distribution lines. All structures usesingle-high breaker arrangements.Eaton has been manufacturing mediumvoltage switchgear for over 60 years, andEaton’s vacuum interrupters are secondto none, with tens of thousands currentlyin operation.Ratings Eaton’s Power XpertT XGIS gas-insulatedmetal-enclosed switchgear is an integratedassembly of SF6 pressurized tanks,bus and disconnect switches that arecoordinated electrically and mechanicallyfor medium-voltage circuit protection.Horizontal bussing uses a solid shieldedinsulation system.Eaton’s XGIS utilizes a compartmentalizeddesign, in accordance with Loss ofService Continuity (LSC) standardswithin IEC 62271-200. All major primarycircuit components are isolated fromeach other by grounded metal barriers.This type of construction minimizes thelikelihood of arcing faults within theequipment and propagation of faultbetween the compartments containingmajor primary circuits. In addition, allXGIS designs are arc resistant and testedper the Internal Arc Classification (IAC)guidelines of IEC 62271-200. Rated voltage (Ur):5 kV, 15 kV, 27 kV, 38 kVInterrupting ratings (rated short-circuitbreaking current): 25 kA or 31.5 kARated normal current—main bus:1200 A, 2000 A or 2500 ARated normal current—circuit breakers:1200 A, 2000 A or 2500 ARated frequency: 60 HzRated altitude: 4000 mWith reliability as a fundamental goal,Eaton engineers have simplified the XGISswitchgear design to minimize problemsand gain trouble-free performance.Special attention was given to materialquality and maximum possible use wasmade of components proven over theyears in Eaton switchgear.Benefits of using gas-insulated switchgear: Standards and Certifications IEC 62271-1IEC 62271-100IEC 62271-102IEC 62271-200 (including loss ofservice continuity and internalarcing fault classifications)IEC 62271-201UL listed Overall footprint using GIS issignificantly reduced compared toair-insulated switchgear (AIS)In addition to footprint, equipmentroom space is maximized by mountingthe switchgear against the wall (no rearaccess is required)Maintenance requirements areminimized by the use of enclosedlong-life vacuum interrupters sealed ina pressurized SF6 tank mediumSF6 gas has high dielectric properties,making it the ideal insulation mediumThe parts inside the tank aremaintenance-free for the life ofthe equipmentXGIS utilizes compartmentalizedstructuresSeismic QualificationRefer to Power Distribution SystemsDesign Guide for information onseismic qualification for this andother Eaton products.EATON www.eaton.com
Design Guide DG022020ENPower Xpert XGIS General DescriptionEffective April 202012.1-3Loss of Service Continuity (LSC)Degrees of Protection (IP)Eaton’s XGIS medium-voltage switchgear meets all of thefollowing categories of the LSC2 family, with LSC2B being themost stringent:Eaton’s XGIS medium-voltage switchgear is available withIP rating IP4X.LSC2—Functional unit having at least an accessiblecompartment for the high-voltage connection (calledconnection compartment), such that, when this compartmentis open, at least one bus bar can remain energized and all otherfunctional units of the switchgear can be operated normally LSC2A—Functional unit of category LSC2 such that, when anyaccessible compartment (other than the bus bar compartmentof single bus bar switchgear) is open, at least one bus bar canremain energized and all other functional units of theswitchgear can be operated normally LSC2B—Functional unit of category LSC2A, where thehigh-voltage connections (e.g., cable connections) to thefunctional unit can remain energized when any otheraccessible high-voltage compartment of the correspondingfunctional unit is open The LSC category describes the extent to which the switchgear isintended to remain operational in case access to a high-voltagecompartment is provided. For each functional unit of switchgear,the LSC category describes the extent to which other high-voltagecompartments and/or functional units may remain energizedwhen a main circuit compartment of this functional unit is opened.Compartments deemed accessible within an XGIS functionalunit are connection compartment and upper VT compartment;compartments deemed non-accessible within an XGIS functionalunit are bus bar compartment and three-position switch/breakercompartment (gas tank).See IEC Standard 62271-200 for additional information regardingLSC categories.IP classifications are intended to define the degrees of protectionprovided by switchgear enclosures of electrical equipment withregards to:Protection of persons against access to hazardous parts insidethe enclosure Protection of the equipment inside the enclosure againstingress of solid foreign objects Protection of the equipment inside the enclosure againstharmful effects due to the ingress of water See IEC Standard 60529 for additional information regardingIP classifications.Switchgear Assembly RatingsTable 12.1-1. Switchgear Assembly RatingsRatedMaximumVoltagekV thstandVoltage[LIWV] (BIL)kV -Second)kA rms SymPowerFrequencyWithstandkV rms512002000250060606025, 31.525, 31.525, 31.51919191512002000250095959525, 31.525, 31.525, 31.53636362712002000250012512512525, 31.525, 31.525, 31.56060603812002000250017017017025, 31.525, 31.525, 31.5808080EATON www.eaton.com
Power Xpert XGIS DevicesDesign Guide DG022020ENEffective April 202012.1-4Switchgear ConstructionOverviewEaton’s XGIS medium-voltage switchgear platform is a frontaccessible, single-high breaker construction that uses SF6 asthe primary insulation medium. The switchgear is availablewith an arc-resistant certification. The XGIS platform does notrequire any on-site gas filling during commissioning and is builtto allow replacement of center panels without deconstructingthe entire lineup.Each switchgear structure is built around a single robot laserwelded tank that typically incorporates the circuit breaker,three-position disconnect switch, and optional VT earthing switchand connections. All of the primary parts are insulated using SF6.The circuit breakers are fully enclosed within the robot laserwelded tank, therefore the circuit breakers are considered fixed.The operating mechanisms for the circuit breaker and threeposition disconnect switch are constructed as part of the tankand are located in the low-voltage compartment to allow forany needed maintenance.Each low-voltage compartment is located at the front of theswitchgear in the upper section and houses all necessaryindicating lights, controls, meters and relays. Above the lowvoltage compartment is a horizontal wireway where low-voltageconductors can enter the switchgear. There are two removablecover plates on top of each section to provide access. See secondimage to the right.The cable compartment is located at the front of the switchgearin the lower section. A bolted door is used to access the cablesthat are connected using T-body connections. In addition to thecable compartment, each structure will need additional spaceunderneath the equipment for cable entry, which can be doneby including a vault in the site work, raising the electrical houseabove grade or installing the switchgear on a platform to raiseit above the floor.XGIS LV Compartment Door OpenThe main bus, constructed out of solid shielded insulated bus,is located on the top of the switchgear and is used to connectall of the panels. The bus is a combination of silicone rubberfor insulation, a metal grounding barrier and copper bus.TankEach tank typically contains a circuit breaker, a three-positiondisconnect switch, sealed rear access cover, and an optionalVT earthing switch with plug-in ports. If the lineup requiresa main-tie-main configuration, tie breakers and riser sectionsare available.Each tank has both pressure gauge and fill port if you need tosample gas for analysis or would need to remove the gas fromthe tank. A view port is also standard on each tank to verifyposition of the three position disconnect switch.XGIS Control Cable Top Entry LocationsAn over pressure safety burst disc is integral to each tank locatedon the rear. The burst disc allows for the venting of arc gasesshould an arc event occur inside the tank.SF6 is used as the insulating medium inside the tank and allowsthe footprint to be reduced to a minimum. The SF6 is enclosedinside the tank by using machine welding to make the tankairtight. The construction of the tank allows for it to be sealedfor life and removes the need for any on-site gas handlingduring commissioning.Tank View PortEATON www.eaton.com
Design Guide DG022020ENPower Xpert XGIS DevicesEffective April 202012.1-5Circuit BreakerThe circuit breaker mechanism as shownto the right is outside of the SF6 tank; thevacuum interrupters are located insidethe SF6 tank. The spring chargingmechanisms can be accessed byremoving the cover plate.The Eaton XGIS vacuum circuit breakerincorporates electrical trip-freecharacteristics. That is, the contacts of thecircuit breaker must return to the openposition and remain there when anopening operation follows a closingoperation, regardless of whether theclosing signal is maintained. A circuitbreaker with "Electrically Trip-Free"features must be able to receive andrespond to an electrical opening signalregardless of whether an electricalclosing signal is applied.Table 12.1-2. Circuit Breaker Ratings and OperationsRatedMaximumVoltagekV rmsRatedContinuousCurrentAmperesRated ShortCircuit CurrentkA rms, symMomentary(Short-Time)WithstandCurrent PeakkABreakingCapacitykAMechanicalOperations a5, 15, 27, 385, 15, 27, 385, 15, 27, 3812002000250025 and 31.525 and 31.525 and 31.582828250.450.450.410,00020002000aEach operation is comprised of one closing plus one opening.The circuit breaker and three-positiondisconnect switch are both mechanicallyand electrically interlocked. The threeposition disconnect switch cannot beoperated manually via the t-handlemechanism or electrically via local orremote operator controls while thecircuit breaker is in the closed position.Circuit Breaker Two ViewVacuum Circuit Breaker AssemblyEATON www.eaton.com
Design Guide DG022020ENPower Xpert XGIS DevicesEffective April 202012.1-6Clearing TimeInterrupting TimeStandard: 35–67 ms (5 Cycle)Contact Parting TimeMaximum Contact Parting Time 58 ms (3.48 Cycle) Based on Minimum TrippingDelay Equal to 8 ms (1/2 Cycle)Tripping Delay Time30–50 ms for 5 Cycle XGIS VI8 ms (1/2 Cycle) Minimum Delay2 sec (120 Cycle) Maximum DelayProtective RelayOperating TimeShort-CircuitBeginsAuxiliary RelayOperating TimeArcing TimeOpening TimeShunt TripOperating TimeRated ControlVoltage EnergizesTrip Coil5–17 msMechanismOperating TimeMainContactsPartsLastPoleClearsFigure 12.1-1. Sequence of Events and Circuit Breaker Operating TimesabTimes shown are based on 60 Hz.% DC component capability (and asymmetry factor S) depend on the minimum contact parting time.The % DC component capability is M 50% (S factor M 1.2) for all circuit breakers.EATON www.eaton.com
Design Guide DG022020ENPower Xpert XGIS DevicesEffective April 202012.1-7Bus CompartmentCable CompartmentThe bus compartment contains themain bus for the switchgear lineup andis located at top of the switchgear. Themain bus is constructed in three separateisolated phases using a solid shieldedinsulated bus design.The cable compartment is located atthe front of the equipment in the bottomsection. The operator is able to accessthe cable compartment by removing thebolted cover that is located on the frontof the switchgear. The switchgear isconsidered front accessible.The bus is a stocked item and ispurchased by voltage, either 1250 Aor 2500 A. Standard connections arelocated on the tank and used to attach thebus in the field, and are factory installed.Attaching or removing the bus does notrequire removal of panels or SF6 gas.The construction of the bus consists offour separate layers. The center of thebus is copper bar. As the layers progressoutward, the bus consists of a layer ofinsulating rubber, a metal groundingbarrier and a final layer of insulatingrubber on the exterior.The bus construction allows for currenttransformers to be mounted directly onthe bus.Eaton’s XGIS vacuum switchgear canbe configured for cable or bus (SSIS fortie and sectionalizing sections) outputconnections. When cable connections areemployed, Eaton’s Cooper Power seriesDTS1242 bolted tee and DTB1242 boltedcompanion tee connectors are used withappropriately sized shielded power cableto connect the cable bushings to thevertical section’s load.Eaton’s Cooper Power series DTS1242and DTB1242 connectors are designedfor single-conductor application. Eatonwill supply the Cooper Power connectorsas a standard, but other manufacturersequivalent connectors can be used aswell. The bushing connect is IEC Type C.2000/2500 A Cable CompartmentEaton’s XGIS switchgear designs arefurnished in two rating ranges: up to1250 A output or up to 2500 A output.When cable connected, the cablebushings are configured as singlebushings per phase for the 1250 Adesign, and dual bushings per phasefor the 2500 A design.The XGIS cable bushings canaccommodate up to three connectorsper phase bushing—as either one teeconnector and two bolted companion teeconnectors, or one tee connector and onebolted companion tee connector per phaseif a surge arrester is also connected.1250 A Cable CompartmentsXGIS Bus CompartmentEATON www.eaton.com
Design Guide DG022020ENPower Xpert XGIS DevicesEffective April 202012.1-8Cable ConnectorsTable 12.1-3. DTS1242 Bolted Tee Connector Catalog Numbering SystemDTS1242 F U500 N 1 01 SBScreen BreakBasic Catalog NumberInsulation RangeSee Table 12.1-6Connector SizeSee Table 12.1-7Phase KitTest PointT Test PointN No Test Point1 Single-Phase Kit3 Three-Phase KitCable Sealing KitSee Table 12.1-8Table 12.1-4. DTB1242 Bolted Companion Tee Connector Catalog Numbering SystemDTB1242 F U500 N 1 T1 SBScreen BreakBasic Catalog NumberInsulation RangeSee Table 12.1-6Connector SizeSee Table 12.1-7Phase KitTest PointT Test PointN No Test Point1 Single-Phase Kit3 Three-Phase KitCable Sealing KitSee Table 12.1-8Cooper DTS1242 Bolted Tee and DTB1242 Companion Tee Connector ConfigurationTable 12.1-5. Electrical RatingsDescriptionTable 12.1-7. Conductor SizeRatingMaximum Rated System VoltageBasic Impulse Level42 kV200 kVAC Voltage Withstand (5 min.)DC Voltage Withstand (15 min.)Continuous Current93.5 kV125 kV1250 AThermal Short Circuit, 3 sec.Dynamic Short Circuit45 kA100 kATable 12.1-6. Cable RangeInsulation RangeDesignationCable Insulation Range 41.6E40.144.8F42.947.9G46.551.9H50.056.0Connector Size (mm2)DIN TypesMechanical 30800—S800Table 12.1-8. Cable Sealing Kits00No sealing kit required01Basic tape kit with sealing mastic and tape for one single core cablewith copper screen wires (3 tape kits included with three-phase kit)EATON www.eaton.com
Design Guide DG022020ENPower Xpert XGIS DevicesEffective April 202012.1-9Three-Position Disconnect SwitchVoltage TransformersThe three-position disconnect switch is located in the SF6 tankand the operating mechanism is located external to the tank. It isa non-load breaker device, only intended to connect downstreamelements to the input source under no-load (open circuit)conditions. The switch can be operated electrically or manuallyvia t-handle accessory provided with the switchgear.Voltage transformers for XGIS switchgear have been selectedaccording to IEC standards, as referenced above: IEC 61869-1(Instrument Transformers) and IEC 61869-3 (Inductive VoltageTransformers).The grounded and closed (connected) position contacts aresockets, electrically connected to their respective bus groundor incoming power. A center socket between the ground andmain bus is connected to the circuit breaker. The screw drivenconnection moves to connect the circuit breaker to either ground,open or closed positions.A viewing port is available to observe the three-positiondisconnect switch. This port is available for mounting a cameraif desired. The camera can be used during maintenance andoperation procedures to verify switch location (ground, openand closed) as shown below.Table 12.1-9. Three-Position Disconnect Switch OperationsRated Maximum Voltage kV rmsMechanical Operations5, 15, 27, 38 kV2000Chosen for application either inside or outside the verticalsection, VTs are metal-clad single-pole transformers, insulatedand cast with epoxy resin for indoor application. The resin bodyis covered with a welded grounded aluminum box. The VTs aresuitable for installation inside or outside of the switchgear andmeet all relevant international standards.The primary coil and core together with the secondary winding(s)are completely resin embedded and cast in a single step process.The secondary terminals are integrated in the resin body andprotected by the aluminum box.XGIS VTs can be furnished as either fused or unfused units.Fused VTs can be furnished for the vertical section main bus(l
welded tank, therefore the circuit breakers are considered fixed. The operating mec hanisms for the circuit breaker and three-position disconnect switch are constructed as part of the tank and are located in the low-voltage compartment to allow for any needed maintenance. Each low-voltage compartment is located at the front of the
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