A 700 Hp motor failed during running with smoke and burnt smell very apparent. Upon inspection, found the stator windings burnt in the slots going to ground. I am attaching couple of pictures here to help indentify possible cause of failure. This motor was in service for 8 years and the previous motor had stator windings tutn to turn failure due to dirt accumulation. We put enclosure around the motor with AC to address the dirt issues. This time there was no dirt observed.
Voltage unbalance is 0.8% and current imbalance is less than 1%.
Motor was operating at 250 amps and spiked to 800 amps for few secs prior to failure.
Any help to identify the cause is highly appreciated.
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