一、引言在煤矿井下大多采用中性点限流供电系统(系指英、印等国一编者注),即在电源变压器的中性点与大地之间接一限流电抗器。在发生接地故障时,电抗器能有效地限制故障电流及故障点释放的能量,从而消除或大大减小电弧所导致的瓦斯爆炸和火灾危害。例如,中性点电抗为1000Ω时,可将550V I. INTRODUCTION Mostly using neutral point current limiting power supply system in coal mines (refer to countries and regions such as Britain and India) Note that a current-limiting reactor is connected between the neutral point of the power transformer and the ground. In the event of a ground fault, the reactor can effectively limit the fault current and fault point of release of energy, thereby eliminating or greatly reducing the arc caused by gas explosion and fire hazards. For example, when the neutral point reactance is 1000Ω, 550V can be used