Submersible pump motor selection error can cause what consequence!

Motor selection error: power is too small, insulation class is not enough, Frequency converter F or above) And so on. Phase winding turns continuously way cause unbalanced three phase current, or a short circuit between windings fault, increase the phase current, fever caused by winding, motor overheating. Stator winding connection errors, such as the Angle of by method of fault in y connection. Motor winding insulation by mechanical vibration ( As large current shock when starting, drag the equipment vibration, motor rotor unbalance, etc. ) Effect, make winding interturn relaxation, insulation cracking etc. Bad phenomenon, accumulating damage effect, heat bilges cold shrink winding due to friction, thus speeding up the insulation aging, leading to the insulation of the carbide damage until it is burned winding. Taking protective grounding is the requirements of national mandatory standard. Only take protective earthing, to ensure the personal safety of use. If there is no protective earthing, once the shell leakage, creates submersible pump outlet water and pumping water charged, endanger human and animal safety, waste a lot of energy at the same time. Submersible pump work in the water, easy leakage power loss or even cause accident getting an electric shock. If equipped with leakage protector, as long as the submersible pump leakage value than leakage protector action current value ( It is generally not more than 30 mA) Leakage protector will cut the power of the submersible pump. If the use of submersible sewage pump itself power supply voltage is slightly lower than the voltage required sewage pump, and add the required length of cable configuration and longer, the pump running cable becomes larger, if long time work for sewage water pump pump motor is very bad. Submersible pump to heavier load relative to average pump, motor rated current is relatively large. Therefore, when selecting frequency converter according to the motor rated current of the rated current of the inverter, mutatis mutandis, to choose, not only power match.
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