Modeling and Simulation of the Generator Circuit Based on RTDS

Through introducing the variable resistance model to simulate the arcing voltage by the arcing resistance, the generator circuit breaker model is built based on RTDS, on which the simulating network of three phase to earth faults in generator source is built up. Taking as the phase on which has the highest degree of asymmetry as example, the fault currents under the case of three phase to earth faults in generator source are simulated separately in different cases as following: without considering the arcing resistance of fault location and without arcing resistance of the generator circuit breaker during opening process; only with considering the arcing resistance of fault location; and only with considering the arcing resistance of the generator circuit breaker during opening process. Finally, using the Playback model in RTDS/RSCAD, the above simulation results are analyzed and compared in order to get the effects of the arcing on the short circuit current. This study may provide a reference for determining the short circuit current interrupting capability of the generator circuit breaker under the short circuit occurred in source side.