Seven details to extend the service life of submersible pumps Question: There are many submersible pump protectors available on the market today, including leaky submersible pump protectors and overheated submersible pump protectors. The protection project covers submersible pump oil chamber leakage protection, motor leakage protection, wire box immersion protection, insulation resistance protection, winding overheating protection, bearing overheating protection. However, in order to prolong the service life of the submersible pump and avoid the occurrence of safety accidents, we also need to pay attention to the following seven details. 1, to confirm the correct direction of rotation of the motor should be clear motor rotation direction, there are many types of submersible pump forward and reverse can be water, but the reversal of the small amount of water, the current large reversal time Will damage the motor winding. 2, prohibit the power supply voltage abnormal boot Since the low-voltage power supply line is longer, the end of the line voltage is too low is common. When the phase voltage is lower than 198 volts, the line voltage is lower than 342 volts, the submersible pump motor speed drops, when less than 70% of the rated speed, start the centrifugal switch will be closed, resulting in a long time winding start energized or even burn out Windings and capacitors. In contrast, overvoltages cause the motor to overheat and burn the windings. Therefore, the submersible pump operation, the operator must always observe the power supply voltage value, if less than 10% of the rated voltage below 10% above the rated voltage, the motor should be stopped to find out the cause and troubleshooting. 3, cable installation and submersible pump insulation resistance requirements When installing submersible pump, the cable should be overhead, the power cord not too long. Submersible pump into the water or made when not to force the cable, so as not to cause the power cord rupture. Submersible pumps do not sink into the mud during work, otherwise it will lead to poor motor cooling and burn motor windings. When installed, the insulation resistance of the motor should not be less than 0.5 megohms. 4, leakage protection installation Leakage protection is also called lifeguard, its role from the "lifeguard" these three words can be understood. Because the submersible pump works underwater, it is easy to cause electric leakage due to leakage and even cause electric shock accident. If equipped with leakage protector, as long as the leakage current of the submersible pump exceeds the operating current of the earth leakage protector (usually not more than 30mA), the earth leakage protector will cut off the power of the submersible pump to ensure safety and avoid electric leakage and waste of energy. 5, to avoid frequent switching Do not switch the submersible pump frequently, this is because the pump will stop when the return flow, if immediately start, the motor load will start, causing the starting current is too large and burn the winding. As the start-up current, frequent start-up will also burn the submersible pump motor windings. 6, let submersible pump long-term overload work To avoid long-term overload pump submersible work, do not pumping large amounts of water and keep the current value is observed on the nameplate if the value is found, if the current is too large should be shut down an examination. In addition, the pump running time dehydration should not be too long, so as not to overheat the motor and burned. 7, pay attention to routine maintenance Often need to always check the motor, found under the crack, rubber seal ring damage or failure, etc., should be promptly replaced or repaired to avoid water infiltration submersible pumps. The application of submersible pump protector and pay attention to some daily protection can better extend submersible pump life.
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