矿井中性点不接地系统电弧接地故障的仿真研究

Simulation Research on Electric Arc Grounding Fault of Non-Grounding System for Mine Neutral Point

漏电保护是保证煤矿井下安全供电、防止人身触电的重要措施。通过分析煤矿井下漏电保护的现状,针对井下漏电保护装置对电弧接地故障检测灵敏度不高的不足,从工频熄弧理论计算和EMTP-RV仿真2个方面,对中性点不接地系统电弧接地故障时零序电压及故障支路、非故障支路零序电流变化规律进行分析研究,总结了煤矿井下供电系统电弧接地故障的暂态特性,为煤矿井下高产高效综采工作面供电系统漏电保护装置的设计提供理论依据。

The electric leakage protection is the important measure to ensure the safety power supply of the underground mine and to prevent the electric shock of the mine personnel.With the analysis on the present status of the underground mine electric leakage protection,according to the shortage of the underground mine electric leakage protection device less sensitive to the electric arc grounding fault detection,from the main frequency arc extinguishing theory calculation and the EMTP-RV simulation,a analysis and study was conducted on the zero voltage and the zero sequence current variation law of the fault branching-off as well as non fault branching-off when the electric arc grounding was failure in the non-grounding system of the neutral point.The paper summarized the transient state features of the electric arc grounding fault in the mine underground power supply system,which could provide the theoretical basis to the design of the electric leakage protection device for the power supply system of the high production and high efficient fully mechanized coal mining face in underground mine.