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Some taboos to pay attention to when submersible pumps are running

19 Jan 2021Email

Pay attention to the use of the submersible pump when it is in operation to avoid burn-in caused by improper use. Some taboos should be paid attention to when submersible pump is running:

Some taboos to pay attention to when submersible pumps are running

1. Do not ground the submersible pump

Protective grounding of submersible pumps is a requirement of national mandatory standards. Only by taking protective grounding can the personal safety during use be ensured. If there is no protective grounding, once the shell leaks, the water at the outlet of the submersible pump and the surface of the pumped water will become charged, endangering the safety of humans and animals, and waste a lot of electricity. If the metal shell of the submersible pump is grounded with a grounding body that meets the national standard (ground resistance is not greater than 4Ω), when the shell of the submersible pump leaks, the current flows through the metal shell of the submersible pump, the protective grounding wire, the grounding body, the earth, and the transformer. The grounding wire and the power supply form a closed loop. When the leakage current is too large, especially when the live wire hits the shell, the protection 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 cut off.

2. Do not install a leakage protector for submersible pumps

  The submersible pump works in the water, and it is easy to leak electricity and cause electric energy loss or even 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 (generally no more than 30 mA), the leakage protector will cut off the power supply of the submersible pump.

3. Avoid starting the submersible pump when the power supply voltage is abnormal

   Too high or too low voltage will cause the submersible pump temperature to rise too high, shorten the service life or even burn 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, the operator must always observe the power supply voltage value, if it is less than 10% of the rated voltage, more than 10% of the rated voltage, or the current is greater than 20% of the rated current of the submersible pump, it should be immediately Stop and avoid starting when the power supply voltage is abnormal.

4. The submersible pump should not rotate the motor in the opposite direction

   There are many types of submersible pumps that can output water in both forward and reverse rotation, but the water output is small and the current is large during reverse rotation. Long reverse rotation will damage the motor windings. Therefore, the submersible electric pump should be connected to the power source to check whether the direction of rotation is correct before entering the water. If the impeller of the three-phase submersible pump reverses, 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. Avoid long-term overloading of submersible pumps

   In order to avoid long-term overloading of submersible electric pumps, do not use low-head pumps for high-head work, and do not pump water with large sand content (heavy mud), and always observe whether the current value is within the specified range. If you find that the current is too large, you should stop the machine for inspection. In addition, the submersible pump uses water as the cooling source, so the dehydration operation time of the submersible pump should not be too long.

6. Avoid frequent switching of submersible pumps

   The submersible pump should not be started too frequently, because the submersible pump will produce backflow when it stops. If it is turned on immediately, the motor load will start, resulting in excessive starting current. Therefore, after shutting down, wait for the water in the pipe to return to completion before starting again. Generally, it takes about 5 minutes.

7. Avoid using submersible pumps 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, submersible pumps must not be used in silt environments. In order to prevent the submersible pump from sinking into the silt, the silt in its working environment should be removed before the submersible pump is launched. If possible, the submersible pump should be covered by a fence guard to prevent waste from blocking the water inlet fence and causing the motor to heat up , The water is not smooth.

8. Do not leave the submersible pump in the water for a long time after being stopped

   If the submersible pump is not used continuously after going down the well, it will rust for a long time, causing it to fail to start. Therefore, the deactivated submersible pump must not be left in the water, and it should be turned on once a week and run for 5-10 minutes. When not in use for a long time, it is best not to soak in water for a long time. It should be placed in clean water and run for a few minutes to clean the mud inside and outside the pump, and then ask the water surface to wipe dry, perform a major inspection, disassemble all parts for maintenance, scrubbing, and rust removal Descale, replace the wearing parts, reassemble it, paint and prevent rust and place it in a dry, non-corrosive gas warehouse.

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