What should be paid attention to when using the small submersible pump?

1、 Install leakage protector
Leakage protector is also called life protector. Its function can be understood from the three words "life protector". Because the submersible pump works underwater, it is easy to cause electric energy loss or even electric shock accident due to leakage. If leakage protector is installed,
As long as the leakage value of the submersible pump exceeds the action current value of the leakage protector (generally no more than 30mA), the leakage protector will cut off the power supply of the submersible pump, avoid leakage and waste electric energy, and ensure safety.
2、 Guaranteed supply voltage
Because of the long low-voltage power supply lines in rural areas, the terminal voltage of the lines is often too low. When the phase voltage is lower than 198 V and the line voltage is lower than 342 V, the speed of the submersible pump motor decreases. When the rated speed is not reached 70%, the startup centrifugal switch will close, which will cause the startup winding to be energized for a long time and generate heat, or even burn out the winding and capacitor. On the contrary, the high voltage causes the motor to overheat and burn out the winding. Therefore, during the operation of the submersible pump, the operator must observe the voltage value of the power supply at any time. If it is lower than 10% of the rated voltage and higher than 10% of the rated voltage, the motor shall be stopped to find out the cause and eliminate the fault.
3、 Avoid frequent switching
Do not switch on and off the submersible pump frequently, because there will be backflow when the electric pump stops running. If it is started immediately, the motor will be started with load, resulting in excessive starting current and burning of the winding. Due to the large current during start-up, frequent start-up will also burn out the motor winding of submersible pump.
4、 Do not overload the submersible pump for a long time
In order to avoid long-term overload operation of the submersible pump, do not pump water with large sediment content, and observe whether the current value is specified on the nameplate at any time. If it is found that the current is too large, it shall be shut down for inspection. In addition, the dewatering operation time of the electric pump should not be too long to avoid overheating and burning of the motor. At the same time, if the rotation direction of the motor is correct, the rotation direction of the motor should be clear. Now there are many types of submersible pumps that can discharge water when they rotate forward and reverse, but when they reverse, the water output is small and the current is large, and the reversal time is long, which will damage the motor winding.
5、 Insulation resistance requirements for cable installation and submersible pump
When installing the submersible pump, the cable should be overhead and the power line should not be too long. When the submersible pump is under water or raised, do not force the cable, so as to avoid breaking the power line. Do not sink into the mud when the submersible pump is working, otherwise the motor winding will be burnt due to poor heat dissipation. During installation, the insulation resistance of the motor shall not be less than 0.5 megohm. The motor shall be inspected frequently when problems are found and repaired in time. If cracks are found on the lower cover, damage or failure of the rubber sealing ring, it shall be replaced or repaired in time to avoid water infiltration into the submersible pump.