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有些社队的机井设备,越急用时越出毛病。有一个公社,半天之内就烧坏多台电动机。这是怎么回事?又怎样避免? 水泵靠电动机旋转才能提水,电动机旋转又靠电。三根火线(三相电)正常电压为380伏,电流也有一定数值。当发生下列情况时,电流会增大:①地下水下降,使水泵扬程超过规定;②水泵、电动机有毛病;③电网的电压偏低。当电流过大,时间长了,电动机就发热,直到烧坏里
Some commune equipment wells, the more urgent the more problems. There is a commune that burns more than one motor within half a day. What is going on? And how to avoid it? The water pump can rotate the motor to lift the water, the motor rotates again by electricity. Three FireWire (three-phase power) normal voltage of 380 volts, the current has a certain value. When the following conditions occur, the current will increase: ① groundwater drop, so that the pump head exceeds the provisions; ② pump, motor faulty; ③ grid voltage is low. When the current is too large, a long time, the motor heat, until burned