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Short Circuit Rating

Short Circuit Rating

Short Circuit Rating

(OP)
May i know why equipment short circuit rating for 500kV is 50kA/1sec not 50kA/3sec if compare to 275kV which is 31.5kA/3sec.

Thanks.

RE: Short Circuit Rating

Any fault on a 500kV system that persisted for even 1 second would probably cause widespread instability.  Also, compare the energy levels.

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