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

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

Two-charge single-bus segment DC system wiring diagram

Single-charge single-bus DC system wiring diagram

Feed network and its equivalent circuit diagram(a)without transformer(b)withtransformer

Four types of short circuit and short circuit current(a)Three-phase short circuit(b)Two-phase short circuit(c)Two-phase ground short circuit(d)Single-phase earth short circuit