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

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 current-carrying time on switching overvoltage.