• The failure of the motor can be divided into electrical failure and machine failure. Machine fault is one of the important vibration, bearing overheating, swept rotor chamber, abnormal running noise, etc.; If electric has heavy motor winding grounding, short circuit, open circuit, touch bad, squirrel cage broken bars fault.

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• High voltage explosion-proof motor winding insulation failure, the function of insulation materials, production process control, operation device environment and comprehensive identity, such as electrical, thermal, chemical, produce because of the previous match multifarious, joint examples above.

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• 1, the electrochemical breakdown

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• Gasification plant workshop two fault motors, collapse of reflection, three places on one stator winding insulation breakdown, 1 insulation breakdown, everywhere are the pitting corrosion damage insulation provoked the creepage, burn mark, aperture, conductive channel, and the point of failure in motor inlet end now and have to be to move toward. To this, let's layout, running environment, from the motor control method and so on because that reason, beginning as the department because the selection is not reasonable, running environment badly behaved by electrochemical breakdown.

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• Runtime environment badly behaved provoked electrochemical breakdown is an important reason of insulation damage reason. Atmosphere in acid and alkaline gas decay is corrupt insulating material, outside the atmosphere humidity is big, to speed up the better function of insulation materials, inorganic insulation material in electrical, thermal, chemical and other identity under the comprehensive influence of easily provoked mutilate * * * cause breakdown.

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• 2. Frequent startup

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• The high voltage explosion-proof motor frequently directly affects its application life. This is because the electric secret under large current when starting, winding of motor and the thermal stress superposition influence. Because the winding insulation materials and copper conductor contraction coefficient of different, at startup insulating material between the conductor and constitute a great Fried shear stress, strong between conductor and insulation materials will be destroyed, insulation layer or tear that produce insulation breakdown.

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• Squirrel-cage asynchronous motor in the trouble starts, article also constitute a squirrel cage is broken easily, especially load to start the motor, a higher probability of failure.

3. The embedded line defect

When embedding binding end end insulation sag mutilate, make up the damage of high voltage motor winding is another nervous status. End ring that touches the part, outside insulation are different levels to squeeze out the concave on the trench, to make a hardening of the department of insulation will be squeezed to meet binding touch the edge of the whole after curing, the department of insulation significant thinning, low dielectric strength.

4. End handbags insulation poor quality

End handbags and poor quality constitute end insulation or abnormal relatively short circuit examples. Handbags insulation blanket is not tight, the outside there are gaps, in the environmental humidity is high, the insulation of the winding function significantly reduced until condensation, insulation outside the insulation outside culture netease in provoking creeping discharge. The discharge mechanism is now beginning to natural water film on the outside of the insulation, under the influence of electric field, ions ionized water membrane and along the outside move, collect, constitutes a non-uniform electric field distribution, down the outside of the discharge voltage at the same time. Such along the discharge outside, in fact, a kind of gas medium discharge signs, its various voltage than low breakdown voltage of gas or a solid, occasional delay surface "creepage can reach tens of centimeters apart. Creeping discharge can cause high permeate sex between potential breakdown flashover, the interphase short circuit breakdown.

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