从一起直流接地故障探析大型厂站直流系统运行

Discussion of DC system operation for large station based on a DC grounding fault

通过对一起直流系统瞬时接地故障的分析,指出由于寄生回路的存在,导致两套完全独立的直流系统微机绝缘监测装置同时误报接地故障;大型厂站内大量微机型绝缘监测装置、静态型保护装置、滤波回路及长电缆等设备的广泛使用,使得直流系统运行面临很多新问题;对新形势下大型厂站的直流系统运行进行了探讨。

Based on the analysis of an instantaneous direct current(DC) system ground fault, it is found that the parasitic circuit brings about the ground fault in two completely independent DC system simultaneously. The wide use of devices such as microprocessor-based insulation monitoring device, static type protection device, filtering circuit, long cables and so on in large plant station makes DC system operation have some new problems. The operation of large-scale plant station with DC system under the new situation is discussed.