1, connect the wrong ground power supply. Submersible pump cable has four cores, be careful not to ground the line as the wrong access to the power cord.
2, submersible pump mechanical seal damage and leakage. Inspect the insulation resistance of the submersible pump frequently with megohmmeter, take the maintenance measure in time when the insulation resistance is reduced, will not cause the electrical machinery to burn out.
3, cable water damage. Always check the submersible pump insulation resistance.
4, impeller stuck. Impeller stuck stuck, the current ratio of the rated increase, over time, the submersible pump stator winding will soon be burned.
5, the stator windings touch the shell at both ends, the winding on the ground breakdown. 6, submersible pump "open", "stop" too often.
7, submersible pump dehydration running time is too long. Submersible pump dehydration running time can only be about 1 minute time, a long time, the pump due to poor cooling and temperature.
8, lack of work. Sub-phase work, the submersible pump is generally in the braking state, the current is much larger than the rated value, when the submersible pump winding temperature rise, a long time, will burn out the stator windings.
First, the main reason affecting the normal operation of submersible pumps:
Under normal circumstances, the main factors that affect the normal operation of submersible pumps are as follows.
(1) leakage problem. Submersible pump is characterized by pump one, and not into the water together, so the leakage problem is one of the important factors that affect the normal operation of submersible pumps.
(2) Blocked. Submersible pump stalls, the stator winding will produce 5 to 7 times the normal full load current blocking current, without protection measures, the submersible pump burned quickly. Submersible pumps cause stalling for many reasons, such as impeller stuck, mechanical seal debris shaft, dirt winding.
(3) The power supply voltage is too low or the frequency is too low.
(4) wear and rust. Wear will greatly reduce the pump performance, flow, lift and efficiency are reduced, impeller and pump cap rust will cause stalling. Submersible pump parts corrosion will not only affect the performance of the pump, but also shorten the service life.
(5) cable rupture, broken. Broken cable, broken not only likely to cause electric shock and pump operation is most likely in a two-phase work in the state, neither water and easy to damage the motor.
Second, the submersible pump operation and maintenance
(1) Check the cable is broken, broken phenomenon. It is necessary to observe the appearance of the cable before use, but also with a multimeter or megger to check whether the cable access. There should be no cable outlet leakage phenomenon.
(2) Prior to use of the new pump or long-term backup pump placed before the start of the application of megohmmeter measuring stator insulation of the shell is not less than 1MQ, or the motor winding should be dried to improve the insulation level. Insulation resistance of the submersible pump at the factory when the cold state measurements are generally more than 50Mr2.
(3) check whether the submersible pump leakage. Submersible pump may have oil leaks at the cable junction, sealing room at the oil seal screw seal and seal 0-ring. Check to determine whether the true spill. Oil leakage caused by refueling at the screw because the screw is not tightened, or under the screw oil rubber pad damage. If you determine the O-ring seals leak, it is mostly because the O-ring seal failure, this time need to open the pump to replace the seal ring.
(4) long-term use of the submersible pump before re-use should be dismantled the top level of the pump shell, impeller and then re-start to prevent corrosion of components to start without water and burn motor windings. This is more important for water-filled submersible pumps.
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