Master Electrician Knowledge

VD4-12 Spring-operated circuit breaker control, signal circuit（Module operating mechanism） SFA:change-over switch SFB:change-over button BB:Thermal relay BT:Temperature measurement MS:Energy storage motor QF:Dc air circuit breaker QC:Ground switch W CC: Wire Connection Center V:Rectifier bridge The

The control and signal circuit of the three-out-of-two incoming circuit breaker FU:Fuse SFA:change-over switch SFB:change-over button KFM:Intermediate relay CBC:Closing coil QA:Travel switch CBO:Opening coil PGR:Red signal light PGG:Green signal light PGW:White signal light BG1:Circuit breaker hand

Primary main wiring of single bus segment TA:Current transformer TV:Voltage transformer PG:Pressure Gauge QA:Circuit breaker QB:Disconnecting switch QC:Ground switch

Secondary control circuit diagram of isolation switch and ground switch in combined electric SP:Limit device CX:Closing contactor SFA:selector switch SFB:selector button 89KT:Thermal relay TX:Dc switching contactor

Composite electrical signal alarm circuit secondary wiring diagram SFA:change-over switch SFB:change-over button KFM:Intermediate relay

Substation secondary circuit wiring diagram note 1:When used for bus Ⅱ power input, QA1 is changed to QA2 note 2:When used for bus Ⅱ power input, change terminals A17,C18 from the busbar integrated protection device to C23,C24 QA:Circuit breaker TA:Current transformer FE:Lightning arrester FU:Fuse B

Secondary circuit diagram of power supply entry circuit breaker cabinet BB:Microcomputer line protection measurement and control device SFA:Selector switch PGW:White light PGG:Green light PGR:Red light FU:Fuse XG:Connecting piece V:Rectifier bridge CBO:Opening coil QA:Circuit breaker BG:Travel switc

Secondary circuit diagram of 110kV power supply incoming line BB:Microcomputer line protection measurement and control device SFA:Selector switch SFB:Selector button PGW:White light PGG:Green light PGR:Red light QB:Travel switch

11kV Substation secondary circuit wiring diagram BB:Microcomputer line protection measurement and control device SFA:Selector switch TA:Current transformer FE:Lightning arrester FU:Fuse QA:Circuit breaker

110kV Bus block spacing secondary circuit BB:Microcomputer line protection measurement and control device SFA:Selector switch SFB:Selector button PGW:White light PGG:Green light PGR:Red light QB:Travel switch TA:Current transformer

Voltage transformer secondary circuit diagram

Secondary circuit diagram of voltage transformer using V-V connection