What should I do if the submersible pump burns out? What caused it? The reasons and solutions for the problems can be summarized as follows:
1. The grounding wire is connected to the wrong power supply. There are four cores in the cable of the submersible pump, be careful not to connect the grounding wire incorrectly as a power line.
2. The mechanical seal of the submersible pump is damaged and leaks water. Regularly use a megohmmeter to check the insulation resistance of the submersible pump. If the insulation resistance decreases, take timely maintenance measures to prevent motor burnout.
3. Water ingress after cable damage. Regularly check the insulation resistance of the submersible pump.
4. The impeller is stuck. When the impeller gets stuck and cannot rotate, the current ratio increases. Over time, the stator winding of the submersible pump will quickly burn out.
5. The two ends of the stator winding touch the shell, and the winding breaks through to the ground.
6. The submersible pump starts and stops too frequently.
7. The dehydration operation time of the submersible pump is too long. The dehydration operation time of the submersible pump can only be about 1 minute. As time goes on, the temperature of the electric pump will increase due to poor heat dissipation.
8. Lack of phase work. When the submersible pump is in phase loss operation, it is generally in the braking state, and the current is much higher than the rated value. At this time, the temperature of the submersible pump winding rises, and over time, it will burn out the stator winding.
The main reasons affecting the normal operation of submersible pumps are:
In general, the main factors affecting the normal operation of submersible pumps are as follows.
(1) Leakage problem. The characteristic of a submersible pump is that the pump and the machine are integrated and submerged together, so leakage is one of the important factors affecting the normal operation of the submersible pump.
(2) Blocked rotation. When a submersible pump is stuck, a stuck rotor current of 5-7 times the normal full load current will be generated on the stator winding. Without protective measures, the submersible pump will quickly burn out. There are many reasons for the blockage of submersible pumps, such as impeller jamming, mechanical seal debris jamming, and dirt entanglement.
(3) The power supply voltage is too low or the frequency is too low.
(4) Wear and corrosion. Wear and tear will greatly reduce the performance of the electric pump, resulting in a decrease in flow rate, head, and efficiency. Rust on the impeller and pump cover will also cause stalling. The corrosion of submersible pump components not only affects the performance of the pump, but also shortens its service life.
(5) The cable is broken or broken. Cable breakage and breakage not only easily cause electric shock accidents, but also make it highly likely that the water pump will be in a two-phase working state during operation, resulting in no water discharge and easy damage to the motor.
Operation and maintenance of submersible pumps
(1) Check whether the cable is cracked or broken. Before use, it is necessary to observe the appearance of the cable and use a multimeter or megohmmeter to check if the cable is properly connected. There shall be no oil leakage at the cable outlet.
(2) Before using a new pump or starting a backup pump that has been stored for a long time, a megohmmeter should be used to measure that the insulation between the stator and the casing is not less than 1MQ. Otherwise, the motor winding should be dried to improve the insulation level. The insulation resistance value of submersible electric pumps at the time of leaving the factory generally exceeds 50Mr2 when measured in cold state.
(3) Check if the submersible pump leaks oil. The possible oil leakage routes of submersible electric pumps include cable connections, sealing at the oil filling screw in the sealing chamber, and O-ring seals at the sealing points. During inspection, it is necessary to determine whether there is a genuine oil leak. The reason for oil leakage at the refueling screw is that the screw is not tightened or the oil resistant rubber gasket under the screw is damaged. If it is determined that there is oil leakage at the sealing point of the O-ring, it is mostly due to the failure of the O-ring seal. At this time, the electric pump needs to be disassembled and the sealing ring needs to be replaced.
(4) Before reusing a submersible electric pump that has been out of service for a long time, the previous pump casing should be disassembled, the impeller should be turned, and then restarted to prevent rusting of the components and failure to produce water, which could damage the motor winding. This is more important for water filled submersible electric pumps.
