MCC Flashover

[burntcoil]

A single phase fault in a 480V MCC led to 3-phase flashover. This flashover caused some other equipment to trip on Overvoltage on 480V switchgear feeding the MCC that experienced flashover. Can flashover in MCC cause overvoltage spikes upstream in 480V switchgear?

 

[waross]

A single phase to ground fault may cause the line to ground voltages of the other phases to rise to phase to phase voltage.

Bill
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"Why not the best?"
Jimmy Carter

 

[Power0020]

depends on neutral point grounding

 

[jraef]

Any time you have an arc in AC, there is a capacitive effect that raises the voltage. But it's more likely that what waross said is what your sending equipment captured. By the time the ground fault caused a flashover, the voltage increase would have already been recorded.


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