三峡左岸电站直流系统由于存在通过二极管并联的双路供电支路,这种支路在正常运行时会存在一个环路电流,因此当直流系统发生接地故障时绝缘检测仪不能正确地检测到接地支路,因而总是误报出一些错误的接地信号。要想解决这个问题最简单的方法就是断开环路。本文根据三峡电站直流系统的特点,提出了三峡电站直流系统最适宜的三种断开环路方法。 Due to the presence of two-way power supply branches connected in parallel by diodes, the DC system of the Three Gorges Left Bank Power Station will have a loop current during normal operation. Therefore, the insulation tester can not correctly detect the grounding branch when a ground fault occurs in the DC system Road, and therefore always false positives some false ground signal. The easiest way to solve this problem is to disconnect the loop. According to the characteristics of the DC system of the Three Gorges Power Station, this paper presents the three most suitable disconnecting loops for the DC system of the Three Gorges Power Station.