In this paper, the generator circuit breaker (GenCB) is
simulated using ATP- EMTP software package. Four
main stages of the breaker’s operating processes are
considered, namely; the closed contacts stage, the arc
burning stage, the arc extinguishing stage and the opened
contacts stage. Therefore, not only the dynamic
conductance during current zero are considered but also
the effects of arc voltage on the arcing times are
included. The simulation is tested in a representative
network and the results are compared with IEEE
Generator Circuit Breaker standards. A new mitigation
technique is introduced to reduce the transient recovery
voltage and the rate of rise of re-striking voltage during
switching period. The results show that the new technique
reduces both the TRV and RRRV effectively with respect
to previous ones. |
