核电厂两个直流系统母线串电故障分析查找

Analysis on Fault Collusion of Buses of Two DC Systems in Nuclear Power Plant

介绍某核电厂直流系统绝缘故障的查找方法,分析两个直流系统的两段母线串电导致绝缘报警的原因与故障现象,指出直流两段母线串电后将增加由于一点接地导致继电保护误动作的风险,并通过一个故障查找实例,介绍一种直流系统串电故障的查找方法。

The method is described to locate insulation fault in the DC system of a nuclear power plant,and analysis is carried out on the causes and fault phenomena of an insulation alarm due to the collusion of two bus sections in two DC systems,based on which the potential risk is pointed out that relay protection misoperation caused by one point grounding will be increased since the two bus sections in the two DC systems are colluded.Taking a case of such fault location as an example,a method for locating fault collusion in DC systems.