1️⃣Avoid being grounded  

It is a national mandatory standard to adopt protective grounding for submersible pumps. Only by adopting protective grounding can the personal safety during use be ensured. If there is no protective 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, endangering the safety of humans and animals, and at the same time wasting a lot of electricity. If the metal casing of the submersible pump is connected to the grounding body (grounding resistance not greater than 4Ω) that conforms to the national standard, when the casing of the submersible pump leaks, the current flows through the metal casing of the submersible pump, the protective grounding wire, the grounding body, the earth, and the work of 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 touches the shell, the protection device of the submersible pump can be activated (fuse blown or air switch tripped) to cut off the power supply of the leakage submersible pump.

2️⃣Avoid not installing leakage protectors

The submersible pump works in the water, and it is easy to leak electricity and cause power 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.

3️⃣Avoid starting the machine 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 or even burn the submersible pump. Due to the relatively long low-voltage power supply lines in rural areas, it is common that the voltage at the end of the line is too low and the voltage at the starting end is too high. Therefore, in the process of using the submersible pump, the operator must observe the power supply voltage value at any time. If it is less than 10% of the rated voltage, more than 10% higher than the rated voltage, or the current is greater than 20% of the rated current of the submersible pump, immediately Shutdown, and avoid starting when the power supply voltage is abnormal.

4️⃣Avoid the motor rotating in the opposite direction

There are many types of submersible pumps that can produce water in both forward and reverse rotations, but the water output is small and the current is large during reverse rotation, and the motor windings will be damaged if the reverse 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 correct. If the impeller of the three-phase submersible pump is reversed, it should be stopped immediately, and the wiring of any two phases in the three-phase core wire in the cable can be exchanged.

Conclusion

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