New coil picture -- China Submersible Transfer Pump
The appearance of the new coil enamelled wire is complete, the wire is bound, and the insulating material is free of deformation and damage.
Problem point 1: lack of phase -- China Submersible Transfer Pump
Cause description
Lack of phase is the open circuit of one phase of the power supply. The main reason is that the fuse of one phase is blown, the contactor is opened, or the power line of one phase is damaged.
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| Star connection (Y-connection) | Triangular connection |
Fault shooting
Phase loss burning machine of three-phase motor: star connection method burns two phases and triangle connection method burns one phase
Problem point 2: Inter turn short circuit problem -China Submersible Transfer Pump
Cause description
The inter turn short circuit of motor is generally caused by sundries falling in, stator and rotor friction, paint damage and other problems
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Slot breakdown of motor
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| Breakdown of protector | Breakdown of lead wire and welding |
Problem point 3: overload-China Submersible Transfer Pump
Cause description
If the motor is overloaded, it will cause motor overload.
Note: both undervoltage and overvoltage will cause insulation damage and overload.
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The heat dissipation of the motor is poor, and all insulation materials are melted and damaged
Plastic protective cover melts and deforms
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| All three phases of motor enameled wire are burnt out | Motor stator and rotor stuck |
Problem point 4: surge - China Submersible Transfer Pump
Cause description
The situation shown in the figure below is generally caused by surge, which may be caused by poor quality of frequency converter, power grid, lightning, capacitor and other electrical equipment. Due to instantaneous high voltage, enameled wire breakdown.
