Computer Simulation of Transient Processes in Hybrid Generator Circuit Breaker During Interruption of Short Circuit Current

The research is dedicated to computer simulation of transients occurring in a hybrid generator circuit breaker during interruption of three-phase short circuit current when the fault is located at the grid's side. Mathematical models of the hybrid circuit breaker elements were described: the arc model between the main contacts in the air, the vacuum arc chamber, and the thyristor switch model. Simulation of the transients occurring in the hybrid generator circuit breaker was performed using ATPDraw software program. Three different arrangements of the hybrid circuit breaker were considered, a comparative analysis of their operation was carried out. To minimize arc current and reduce arc duration the algorithm of the optimum hybrid circuit breaker performance was suggested.