Double bus is mainly used for large-scale power plants and substations

Double bus is mainly used for large-scale power plants and substations, each line consists of a circuit breaker after two busbar disconnectors are respectively connected to two, so that the bus maintenance, you can use the line isolator conditions down in a bus on. Double bus also has segmented and non-segmented two kinds,  mcb circuit breaker  plus bypass breaker, wiring complexity, but the maintenance is very convenient, power range can be reduced. Substation secondary circuit comprising: a  air circuit breaker , protection, control and signal circuit parts. Measuring circuit comprising: metering measurement and protection measurements. Control circuit includes: local manual sub-gate, anti-jump interlock test, mutual  electric meter  interlock protection trips and the operative part of sub-gate. Signal circuit includes a switching operation status signal, accident signal and tripping accident warning signal.