What are the taboos for submersible pumps?- Zhejiang Shuyilin Electromechanical Co., Ltd

One: Avoid not grounding
Protective grounding of submersible pumps is a requirement of national mandatory standards. Only by adopting 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 electrical energy. If the metal shell of the submersible pump is grounded with a grounding body that meets the national standard (the grounding resistance is not greater than 4Ω), when the submersible pump shell 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.

Two: Avoid not installing a leakage protector
The submersible pump works in the water, and it is easy to leak electricity and cause electric energy loss and even cause electric shock accidents. 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.

Three: avoid the motor rotating in the opposite direction
Nowadays, there are many types of submersible pumps that can output water in both forward and reverse rotations, but the water output is small and the current is large when reverse rotation. Long reverse rotation time 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 connection of any two phases of the three-phase core wire in the cable can be exchanged.

Four: Avoid turning on when the power supply voltage is abnormal
Too high and too low voltage will cause the temperature of the submersible pump 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 line end voltage to be too low and the starting end voltage 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.

Five: Avoid frequent switching
The submersible pump should not be started too frequently, because when the submersible pump stops, it will produce backflow. 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, the interval is about 5 minutes.

Six: Avoid long-term overload work
In order to avoid long-term overloading of submersible electric pumps, do not use low-lift pumps for high-lift work, and do not pump water with a large amount of sand (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.

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

Eight: Do not leave it in the water for a long time after stopping
If the submersible pump is not used continuously after going down the well, it will rust for a long time and cause it to fail to start. Therefore, the deactivated submersible pump should not be left in the water regardless, 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 of the pump. Then the water surface should be wiped dry and a major inspection should be carried out. All parts should be disassembled 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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