Leakage protection is one of the most important measures to ensure the underground power supply system in coal mines.During coal mine production,false trips and failure to trip events in the leakage pro-tection of the coal mine power supply system frequently occur,which lead to switch tripping and the inabili-ty to restore power,severely impacting normal production of coal mine.To address the issue of leakage pro-tection in coal mines,which has long troubled work safety,this paper starts from the principles and charac-teristics of leakage protection in underground coal mine power supply systems to analyze problems encoun-tered during the use of leakage protection,summarize the causes of false trips and failure to trip,and propos-es measures to reduce false trips in underground coal mine power supply systems.These measures include:avoiding the simultaneous presence of two sets of additional DC leakage protection methods in the system,im-proving the sensitivity of selective leakage protection detection components,and ensuring reliable operation of at least the additional DC leakage protection by arranging the system in two levels—main feeder and branch feeder.By summarizing the problems existing in the use of leakage protection,the causes of false trips and failure to trip are found,and reasonable improvement is made,which is of great significance to improve the reliability and safety of coal mine power supply system.
关键词
煤矿井下供电/漏电保护/误动/拒动原因
Key words
Coal mine underground power supply/leakage protection/false trip/Reason for failure to trip
维普
万方数据