In this paper, the generator-circuit-breaker (GenCB) is simulated using ATP-EMTP. The 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. Furthermore, a new mitigation technique is introduced to reduce the transient
recovery voltage (TRV) and the rate of rise of re-striking voltage (RRRV) during switching
period. The results show that the proposed technique successfully reduces both the TRV and
RRRV.
Keywords: GenCB, TRV, RRRV, Fed Faults, ATP-EMTP. |
