热备用状态下的断路器雷击事故分析

摘要

Via analysis to a burnt-down circuit-breaker accident taking place after certain substation undergoing lightning overvoltage, the main cause of circuit breakers undergoing lightning overvoltage damage under electrified state was that overvoltage all round radiation took place at the end of open circuit to make overvoltage raise in great scale. There are two ways such as to raise a circuit breaker itself with standing overvoltage capacity, to strengthen overvoltage protection and to strengthen safety and reliability of circuit breakers.%通过对某变电站遭受雷击过电压后发生的断路器烧毁事故进行分析,得出处于热备用状态下的断路器遭受雷电过电压损坏的主要原因是过电压在开路末端发生过电压全发射,造成过电压大幅度提高。可通过提高断路器本身耐受过电压能力和加强过电压保护两方面来加强断路器的安全性和可靠性。