SLG Momentary Rating

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James Sheldon

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Can anyone provide scholarship regarding the momentary withstand ratings of high voltage disconnect switches and insulators? The nameplate ratings and cantilever forces are based on 3-phase 1/2 cycle momentary RMS. But what if your highest fault value happens to be from a SLG fault, rather than 3-phase? How do you then evaluate the mechanical forces on substation equipment?

Thank you.

James
 
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