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煤矿6 kV供电系统中的常规的过流保护具有反时限保护特性,目前常用的煤矿供电系统综合自动化监控系统采用经低电压闭锁的定时限过电流保护,文章对低电压闭锁的定时限过电流保护替代反时限过电流保护进行可行性分析,并探讨了其在矿区电网6 kV系统中的应用效果。
The conventional overcurrent protection in 6 kV power supply system in coal mine has the inverse time protection characteristic. At present, the integrated automatic monitoring system of coal mine power supply system adopts the definite time overcurrent protection by low voltage lockout. The feasibility of protection against over-time protection against over-time is analyzed and its application effect in 6kV system of mine power grid is discussed.