Master Electrician Knowledge

Equipment room layout of two 12V200kW generators 1-Diesel generator set 2-switchboard 3-Control console 4-Temperature control tank 5-Water pump 6-Oil storage tank 7-Gas extinguisher storage cylinder 8-muffler

Equipment room layout of two 75kW generators 1-Storage library 2-Exhaust fan 3-Water pump 4-Temperature control tank 5-Diesel generator 6-Observation window 7-Control room 8-Distribution panel 9-Control console 10-Air intake fan 11-Rest room

Diagram of calculating the initial value of symmetrical short circuit current I "k from an equivalent voltage source (a)System diagram (b)System positive sequence equivalent circuit diagram

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

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

Single-charge single-bus DC system wiring diagram

Two-charge single-bus segment DC system wiring diagram

Example of application cable connections for small-capacity DC power supplies

Circuit breaker basic control, signal loop FU:Fuse SFA:change-over switch SFB:Button KFM:Intermediate relay CBC:Closing coil QA:Travel switch CBO:Opening coil PGR:Red signal light PGG:Green signal light

Spring-operated circuit breaker control, signal circuit S8\S9:Limit travel switch SFA:change-over switch SFB: change-over b utton QF:Dc air circuit breaker HR:Red signal light HG:Green signal light WCC: Wire Connection Center V:Rectifier bridge The inside of the frame is divided into the inside of t

The control and signal circuit of the three-out-of-two incoming circuit breaker FU:Fuse SFA:change-over switch SFB: change-over b utton 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 han

VD4-12 Spring-operated circuit breaker control, signal circuit SFA:change-over switch SFB:change-over button QF:Dc air circuit breaker QC:Ground switch W CC: Wire Connection Center V:Rectifier bridge The inside of the frame is divided into the inside of the circuit breaker car