Enhancing the operational reliability of circuit breaker pre-insertion resistors: failure mechanisms, modification measures, and condition assessment
Pre-insertion resistors are critical for suppressing inrush currents and switching overvoltages in Extra-High-Voltage (EHV) and Ultra-High-Voltage (UHV) circuit breakers; however, they continue to exhibit a significant failure rate. This study investigates the operational reliability of pre-insertion resistors by chara...