Precautions for use of mine submersible pump

Precautions for use of mine submersible pump
1, the installation of leakage protection Leakage protection device, also known as security, its role from the "security device" the three words can be understood. Because the submersible pump in the water, easy to leakage caused by power loss or even lead to electric shock accident. If the leakage protection device is installed, the leakage protector will cut off the power supply of the submersible pump to avoid leakage of electricity and ensure the safety if the leakage value of the submersible pump exceeds the operating current value of the leakage protector (generally not more than 30mA).
2, the power supply voltage is abnormal MO start in rural areas due to low voltage power supply line is relatively long, the end of the line voltage is too low is common. When the phase voltage is below 198 volts, the line voltage is lower than 342 volts, submersible pump motor speed down, when less than 70% of the rated speed, start the centrifugal switch will be closed, resulting in long start-up winding power and even burn Windings and capacitors. Conversely, a high voltage causes the motor to overheat and burn out the winding. Therefore, the submersible pump in operation, the operator must always observe the power supply voltage value, if less than 10% of the rated voltage, higher than 10% of rated voltage above, the motor should stop running, find out the cause and troubleshooting. In this case,
3, to avoid frequent switching Do not frequently switch on the submersible pump, this is because the pump will stop when the return flow, if the immediate start, the motor load will start, resulting in starting current is too large and burn out the winding. Due to the large current at start-up, the frequent start-up also burns the submersible pump motor windings.
4, let the mine submersible pump long-term overload to avoid submersible pump long-term overload, do not draw large amounts of sediment water and observe whether the current value specified in the nameplate value, if the current is too large, should Shutdown check. In addition, the dehydration pump running time should not be too long, so as not to make the motor overheating and burned.
5, the direction of rotation of the motor to be correct to figure out the direction of rotation of the motor, there are many types of submersible pumps are forward and reverse when the water can be, but the reversal of small water, the current is large, the reversal of a long time Will damage the motor windings.
6, cable installation and submersible pump insulation resistance requirements When installing submersible pumps, the cable to overhead, the power cord should not be too long. Submersible pump into the water or put forward not to force the cable to avoid breaking the power cord. Do not sink submerged pump in the mud, otherwise it will lead to bad motor cooling and burn motor winding. Installation, the motor insulation resistance should not be less than 0.5 megohm. In this case,
7, Qinqin to see the problems found in time to repair the regular checks should always check the motor, if found under the cracks, rubber seal ring damage or failure, should be replaced or repaired, to avoid water infiltration submersible pump.