断路器合闸电阻热容量及额定参数计算分析

Calculation Analysis on Thermal Capacity and Rated Parameters of Circuit-Breaker Closing Resistors

合闸电阻热容量、阻值和接入时间是反映其可靠性的最直接参量。以实际参数的500kV输电系统为计算对象,考虑多种系统工况,对断路器合闸操作时合闸电阻获得结构热进行计算分析,给出500kV断路器合闸电阻热容量的合理范围,并对电阻值和接入时间对操作过电压的影响作定性定量分析。

Thermal capacity, resistance value and current-carrying time are the most direct parameters to reflect the reliability of circuit-breaker closing resistors. Based on 500 kV AC transmission system simulation model with actual parameters, closing resistor thermal capacity under different operation conditions was calculated and reasonable value range of 500 kV AC transmission system was put forward. At last the quantitative analysis was made to the impacts of resistance value and cttrrent-carrying time on switching overvoltage.