251 / 2022-03-14 21:44:31

Design of the 500 kV AC controllable arrester and its electric field distribution analysis

controllable arrester,switching overvoltage,500kV AC system,electric field distribution

Today's super/ultra-high voltage AC systems often use circuit breakers’ switching resistors and metal oxide arresters (MOA) to limit the operating overvoltage level. However, the switching resistor will not only complicate the structure but also increase the failure rate of the circuit breaker. Some 500 kV AC systems tried to cancel the switching resistors. This method is difficult to ensure the low operating voltage ratio and low residual voltage of the MOA at the same time, resulting in uneven voltage distribution of the varistors and severe aging problem. Therefore, this paper developed a high performance 500kV AC controllable arrester to deeply limit the overvoltage level of the system. The modeling and electric field distribution simulation analysis are carried out in order to further optimize the design of controllable arrester.