Analysis on A Converter Station 750kV AC Filter Circuit Breaker Closing Resistance Fault

AC filter circuit breaker of converter station often uses closing resistance to suppress the closing inrush current generated in the switching process of AC filter. With the repeatedly switching of circuit breaker, because of the high voltage level of 750kV circuit breaker and the large mechanical stress, the closing resistance is easy to get faults, resulting in internal discharge failure of circuit breaker. In this paper, we analysis on a <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\pm\ 1100\text{KV}$</tex> converter station 750kV AC filter circuit breaker closing resistance fault case. according to the circuit breaker closing fault record waveform analysis, electromagnetic transient simulation inversion, before the circuit breaker failure to analysis the closing resistance fault, through the return to the factory disassembly analysis, verify the correctness of simulation and fault inversion. Successfully avoid a equipment failure trip, and proposed based on AC filter circuit breaker closing waveform monitoring means of circuit breaker closing resistance analysis method, early detection of equipment internal fault state.