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随着煤矿综采工作面机械化程度越来越高,电气设备的负荷容量也在不断增加,这就给供电带来了新的问题。当工频交流电压等级一定时,电气设备的功率越大,起动电流就越大,电网的电压损失也越大,电动机端的电压过低,直接影响电气设备的正常工作。综采工作面刮板输送机,由于供电距离远,电机动功率大,起动瞬间末端电压降幅较大,造成开关线圈控制电压过低,接触器无法正常吸合,严重制约了综采工作面的安全生产。
With the mechanization of mechanized coal mining face is more and more high, the load capacity of electrical equipment is also increasing, which gives power supply has brought new problems. When the AC voltage of the power frequency is constant, the greater the power of the electrical equipment, the larger the starting current is and the greater the voltage loss of the power grid is. The voltage of the motor terminal is too low, which directly affects the normal operation of the electrical equipment. Full-mechanized mining face scraper conveyor, due to the power supply distance, the motor power is large, the instantaneous voltage drop at the start moment, resulting in the control voltage of the switch coil is too low, the contactor can not be properly closed, a serious constraint to the fully mechanized face Safe Production.