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对露天矿电气工伤事故原因的分析表明,6～10千伏电气设备中发生的伤亡事故,有25～30％是由于线路和电力网装置在操作时错误供电所造成的。因此在线路操作合闸前,必须刚专门的装置—联锁漏电继电器检测绝缘状况。在露天矿內供电的远距离和自动控制中这是个急待解决的迫切问题。采矿工业中所用联锁漏电继电器具有100～300伏的直流(整流)检测电压(U_k),这就可以查明低绝缘电阻(30～360千欧姆)的线路。6～10千伏电网的实际操作表明,在有单相接地保护和单相短路小电流时,电缆线段中就不会发生烧焦的击穿电路,这说明有些故障可以使击穿处的电强度和绝缘
An analysis of the causes of electrical work accidents in open-pit mines shows that 25-30% of the casualties occurring in 6-10 kV electrical equipment are due to erroneous power supply to the line and power network installations during operation. Therefore, before closing the line operation, it must be a special device - interlocking leakage relay to detect the insulation condition. This is an urgent issue to be solved urgently in the long-distance and automatic control of power supply in open-pit mines. Interlocking residual current relays used in the mining industry have a DC (commutation) detection voltage (U_k) of 100 to 300 volts, which identifies lines with low insulation resistance (30 to 360 kOhms). The actual operation of a 6-10 kV network shows that there is no scorching breakdown circuit in the cable segment when there is a single-phase grounded protection and a single-phase short-circuit current, indicating that some faults can make the breakdown electrical Strength and insulation