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近年来在煤矿井下曾多次发生烧毁移动变电站及大型电动机等严重事故。据分析多数是由于井下电力系统瞬变引起的。电力系统发生瞬变,已成为破坏电网的主要原因。电力系统瞬变往往是突然改变电网中的电压、电流及阻抗等参数引起的。如操作开关、发生飞弧、系统发生故障等均将使电力系统中的电流、电压或磁力线等产生突然变化,而又不能立即达到新的平衡,必须经过一瞬变过程达到新的稳定状态。在此瞬间将出现对电气设备有很大破坏性的过电压。煤矿井下电力系统也存在着如下发生破坏性瞬
In recent years, coal mines have repeatedly burned mobile substations and large motors and other serious accidents. According to the analysis of the majority is due to transient power system caused. Transient power system has become the main reason for the destruction of the power grid. Power system transients are often caused by suddenly changing parameters such as voltage, current and impedance in the grid. Such as the operation of the switch, the occurrence of arcing, system failure, etc. will make the power system current, voltage or magnetic lines of force and other sudden changes, but can not immediately reach a new equilibrium, must be a transient process to reach a new steady state. At this moment there will be a very damaging overvoltage on electrical equipment. Coal mine power system also exists the following destructive instantaneous