Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

Substation secondary circuit wiring diagramnote 1:When used for busⅡ power input, QA1 is changed to QA2note 2:When used for busⅡpower input, change terminals A17,C18 from the busbar integrated protection device to C23,C24QA:Circuit breakerTA:Current transformerFE:Lightning arresterFU:FuseBB:Microcomputer line protection measurement and control deviceBG:Travel switchSFU:Transfer switch

Composite electrical signal alarm circuit secondary wiring diagramSFA:change-over switchSFB:change-over buttonKFM:Intermediate relay

Secondary control circuit diagram of isolation switch and ground switch in combined electricSP:Limit deviceCX:Closing contactorSFA:selector switchSFB:selector button89KT:Thermal relayTX:Dc switching contactor

The control and signal circuit of the three-out-of-two incoming circuit breakerFU:FuseSFA:change-over switchSFB:change-over buttonKFM:Intermediate relayCBC:Closing coilQA:Travel switchCBO:Opening coilPGR:Red signal lightPGG:Greensignal lightPGW:Whitesignal lightBG1:Circuit breaker hand test positionBG2:Circuit breaker hand working position1-The incoming line isolation cabinet2-Metering cabinet3-Self-disconnecting circuit breaker cabinet

VD4-12 Spring-operated circuit breaker control, signal circuit（Module operating mechanism）SFA:change-over switchSFB:change-over buttonBB:Thermal relayBT:Temperature measurementMS:Energy storage motorQF:Dc air circuit breakerQC:Ground switchWCC:Wire Connection CenterV:Rectifier bridgeThe inside of the frame is divided into the inside of the circuit breaker car

VD4-12 Spring-operated circuit breaker control, signal circuitSFA:change-over switchSFB:change-over buttonQF:Dc air circuit breakerQC:Ground switchWCC:Wire Connection CenterV:Rectifier bridgeThe inside of the frame is divided into the inside of the circuit breaker car

The control and signal circuit of the three-out-of-two incoming circuit breakerFU:FuseSFA:change-over switchSFB:change-over buttonKFM:Intermediate relayCBC:Closing coilQA:Travel switchCBO:Opening coilPGR:Red signal lightPGG:Greensignal lightPGW:Whitesignal lightBG1:Circuit breaker hand test positionBG2:Circuit breaker hand working position

Spring-operated circuit breaker control, signal circuitS8\S9:Limit travel switchSFA:change-over switchSFB:change-over buttonQF:Dc air circuit breakerHR:Red signal lightHG:Greensignal lightWCC:Wire Connection CenterV:Rectifier bridgeThe inside of the frame is divided into the inside of the circuit breaker car

Circuit breaker basic control, signal loopFU:FuseSFA:change-over switchSFB:ButtonKFM:Intermediate relayCBC:Closing coilQA:Travel switchCBO:Opening coilPGR:Red signal lightPGG:Greensignal light

GIS device definitionGIS is the abbreviation of Gas Insulated Switchgear, which is generally translated as a gas insulated fully enclosed combination appliance, usually using SF6 gas as the insulating medium. Includes circuit breaker (CB), isolation switch (DS), ground switch (ES, FES), BUS (BUS), current transformer (CT), voltage transformer (VT), lightning arrester (LA) and other high voltage components. At present, GIS equipment products have covered the voltage range of 72.5 kV ~1200 kV.Char