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目前我国煤矿井下大型排水设备,大都配备高压鼠笼型电动机。水泵电机直接起动可以简化供电系统,节省设备投资和减少峒室工程量。但是,电动机直接起动受到某些条件的限制,其中主要是受供电网络压降条件的限制。往常需进行一番母线压降计算,一般是按图1自上而下依次先算出供电系统各元件的标么阻抗,然后算出井下中央变电所母线上的残压,最后据根压降要求验算电动机是否允许直接起动。
At present, China’s large coal mine drainage equipment, mostly equipped with high-voltage squirrel-cage motor. Direct start pump motor can simplify the power supply system, saving equipment investment and reduce the workload of the 峒 room. However, direct motor starting is limited by certain conditions, mainly due to the voltage drop conditions in the supply network. Usually need to make some bus pressure drop calculation, generally according to Figure 1 from top to bottom in order to calculate the power supply system components of the standard impedance, and then calculate the underground underground substation bus residual voltage, and finally according to the root pressure drop requirements Check whether the motor is allowed to start directly.