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Motor Failure due to high transient voltage


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I have come across one case where motors experienced damages during commissioning. motors are 11kV rated 650kW. motors are switched with vacuum CB. It is speculated that failure is due to high transient voltages while switching on and off.


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Maybe a little late, but rather late than never.


One possible reason for failure can be voltage spikes due to swithching of the vacuum breaker.


See this enclosed site:




check especially questions/answers on botom of page 3 and on top of page 4.




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