井下低压供电系统漏电保护优化方案研究

Study on Optimization Scheme of Leakage Protection for Underground Low Voltage Power Supply System

结合麻家梁煤炭矿区井下低电压智能馈电开关装置漏电保护发生的问题,研究漏电保护机理及问题原因,并且给出改进措施:消减对于总开关装置漏电检查的干扰。本文现场应用结果说明,改进后的低电压电能供给系统漏电保护功能运行正常,总开关装置漏电时间由原有的2s减少到250ms以内,分开关装置漏电保护功能动作灵敏、稳定。

In this paper, the leakage protection mechanism and the cause of the fault are studied by combining the problems of leakage pro-tection in the low-voltage low-voltage intelligent feed switchgear in Majinliang coal mine area, and the improvement measures are given： theinterference of the main switchgear leakage check is analyzed. Note that the improved low-voltage power supply system leakage protectionfunction is running normally, the total switching device leakage time from the original 2 seconds reduced to 250 milliseconds or less,sub-switch device leakage protection function sensitive and stable.