What Are The Taboos Of Using Submersible Pumps

May 30, 2022

Protective grounding of submersible pump is a requirement of national mandatory standard. Only protective grounding can ensure personal safety during use. If there is no protective grounding, once the shell leaks electricity, the water at the outlet of the submersible pump and the water surface of the pump will be charged, endangering the safety of human and livestock, and wasting a lot of electric energy at the same time.

If the metal shell of the submersible pump is connected with the grounding body conforming to the national standard (the grounding resistance is not greater than 4 Ω), when the submersible pump shell leaks electricity, the current forms a closed circuit through the metal shell of the submersible pump, the protective grounding wire, the grounding body, the earth, the working grounding wire of the transformer and the power supply. When the leakage current is too large, especially when the live wire touches the shell, It can make the protective device of the submersible pump Act (fuse fusing or air switch tripping) and cut off the power supply of the leakage submersible pump.

Leakage protector is not installed

When the submersible pump works in water, it is easy to leak electricity, resulting in power loss and even electric shock. If a 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 30 MA), the leakage protector will cut off the power supply of the submersible pump.

The motor rotates in the opposite direction

At present, many types of submersible pumps can produce water both in forward rotation and reverse rotation, but when reversing, the water output is small, the current is large, and a long reverse time will damage the motor winding. 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 reverses, it shall be shut down immediately and the wiring of any two phases of the three-phase core wire in the cable shall be replaced.

Put it in water for a long time after it is out of service

If the submersible pump is not used continuously after running down the well, it will rust for a long time, resulting in failure to start.

The disabled submersible pump should not be placed in the water. It should be started up once a week and run for 5 ~ 10min.

When it is not used for a long time, it is better not to soak in water for a long time. It should be put in clean water and powered on for a few minutes to clean the mud inside and outside the pump, then put forward to wipe dry the water surface for a major inspection, disassemble all parts for maintenance, scrubbing, derusting and descaling, replace vulnerable parts, reassemble them, and put them in a dry and non corrosive gas warehouse after painting and rust prevention.