Motor Cooling Fan Failure: Electrical failure.
The cooling fan of the motor inlet damp transformer is vertically installed in the middle of the radiator of the outdoor power transformer, so it is very easy to get damp, about 30% of the burned motors were damaged by water ingress and damp. When the motor is flooded, the insulation level of the windings will drop sharply, and interphase breakdown, ground breakdown or inter-turn short circuit will occur. Eventually, the motor burned out. In addition, the water will cause motor bearing corrosion, wear aggravation, or bearing stuck motor rotor blocking phenomenon. Treatment: for the outdoor fan motor should be installed in the design should be made to improve the motor protection level to prevent rain water into or damp. For the damaged motor to be repaired, the waterproof treatment should be strengthened between motor stop, lead wire, shaft and end cover to reduce the possibility of motor water ingress.
(2) the fan motor running without phase will run without phase due to the fault of line, control box or three-phase power supply. The winding of three-phase Motor will be burnt out in short time when the motor is short of operation. Treatment method: Add open-phase Protection Circuit, power station maintenance personnel should be regular maintenance, duty personnel should often patrol.
