核电站接触器型抽屉接地保护配置分析

Analysis on Ground Protection for Withdrawable Part with Contactor in Nuclear Power Plant

核电站核岛低压交流配电盘接触器型抽屉存在着因下游接地故障而引起的上游配电盘越级跳闸失电的风险。重点分析该开关抽屉接地保护配置的设计原理,力求找出越级跳闸风险的根本原因,并探讨技术改造方案。

Nuclear power stations have some low voltage switchboards with contactor withdrawable part, which have a risk of over tripping because of the earth fault of downstream. This paper focused on the principles of ground protection configuration of the withdrawable part, and tried to find the root cause of grade trip and explored the program of technical modification.