Several Precautions in The Operation Of Submersible Pumps

Nov 04, 2022

1. Can not be grounded

The submersible pump only needs to be grounded to ensure personal safety during use. If there is no maintenance and grounding, once the casing leaks electricity, the water at the water outlet of the submersible pump and the surface of the pumped water will be charged, which will endanger the safety of humans and animals, and waste a lot of electricity. If the metal casing of the submersible pump is connected to the grounding body that conforms to the national standard (the grounding resistance is not more than 4Ω), when the casing of the submersible pump leaks, the current flows through the metal casing of the submersible pump, the maintenance grounding wire, the grounding body, the earth, and the transformer. The ground wire and the power supply form a closed loop. When the leakage current is too large, especially when the front touches the shell, the maintenance device of the submersible pump can be activated (fuse blown or air switch tripped), and the power supply of the leakage submersible pump can be blocked.

2. Do not install a leakage protector

When the submersible pump works in the water, it is easy to leak electricity, which will cause power loss and even cause electric shock. If a leakage protector is installed, as long as the leakage value of the submersible pump exceeds the operating current value of the leakage protector (usually not more than 30mA), the leakage protector will cut off the power supply of the submersible pump.

3. Turn on when the power supply voltage is abnormal

If the voltage is too high or too low, the temperature of the submersible pump will rise too high, shorten the service life and even destroy the submersible pump. Due to the relatively long low-voltage power supply lines in rural areas, it is common for the voltage at the end of the line to be too low and the voltage at the beginning to be too high. Therefore, in the process of using the submersible pump, it is necessary for the operator to check the power supply voltage value at any time. If it is less than 10% of the additional voltage, more than 10% higher than the additional voltage, or the current is greater than 20% of the additional current of the submersible pump, it should be That is, shut down, and prevent power on when the power supply voltage is abnormal.

4. The motor rotates in the opposite direction

Nowadays, there are many types of submersible pumps that can produce water in both forward rotation and rotation, but the water output is small and the current is large during rotation, and the motor winding will be damaged if the rotation time is too long. Therefore, the submersible pump should be connected to the power supply before entering the water to check whether the rotation direction is accurate. If the impeller of the three-phase submersible pump is reversed, it should be stopped immediately, and the wiring of any two phases of the three-phase core wires in the cable can be exchanged.

5. Long-term overload work

In order to prevent the submersible pump from overloading for a long time, do not use low-lift pumps for high-lift operations, do not pump water with a large sand content (heavy mud), and check whether the current value is within the scope of the rules at any time. If it is found that the current is too large, it should be stopped to check. In addition, the submersible pump uses water as the cooling source, so the time for the dehydration operation of the submersible pump should not be too long.

6. Frequent switch

The submersible pump should not be started too frequently. This is because the backflow will occur when the submersible pump is stopped. If it is turned on immediately, the motor load will be started, resulting in excessive starting current. Therefore, after the shutdown, it is necessary to wait for the end of the backflow of the stored water in the pipe before it can be restarted, usually at an interval of about 5 minutes.

7. Use in silt environment

If the submersible pump sinks into the mud during use, it will cause poor heat dissipation and burn out the motor windings. Therefore, the submersible pump must not be used in the muddy environment. In order to prevent the submersible pump from sinking into the mud, the mud in the working environment of the submersible pump should be removed before the submersible pump is launched. The motor is hot and the water is not flowing smoothly.

8. Put it in the water for a long time after it is disabled

If the submersible pump is not used continuously after going down the well, it will corrode for a long time, making it unable to start. Therefore, the deactivated submersible pump should not be placed in the water regardless of whether it is in the water. It should be turned on once a week and run for 5 to 10 minutes. When it is not used for a long time, it should not be immersed in water for a long time. It should be placed in clean water and powered on for a few minutes to clean the mud inside and outside the pump, then remove the water surface to dry it, conduct a major inspection, and disassemble all parts for maintenance, wiping, and rust removal. Descale, replace the wearing parts, reassemble it, paint it to prevent rust, and put it in a dry, non-corrosive gas warehouse.