煤矿小电流接地系统单相漏电故障的稳态分析

Steady state analysis of single phase leak current fault in small current grounding system of coal mine

我国煤矿井下高压电网的运行电压为6~10 kV,为了防止单相接地故障时出现较大的接地电流,都采用中性点非直接接地系统,不过不同的运行方式对其漏电保护的要求是不一样的,文中选取煤矿10 kV高压供电网络作为研究对象,详细研究两种运行方式下出现单相接地故障后的稳态特征的不同表现,进而为选线方法提供可靠的理论依据。

Running voltage of chinese underground grid system was 6 - 10 kV. In order to prevent large grounding current occurring in single phase earth fault, neutral non-direct grounding system was adopted. But different operation modes had different requirements for leakage protection. 10 kV high voltage power supply network was taken as research object in this paper. Different manifestations of steady state characteristics after occurring single phase to ground fanlt under two operation modes were studied, which provided reliable theoretical basis to line selection method.