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Surge Arrester Ratings

Surge Arrester Ratings

Surge Arrester Ratings

(OP)
Hello,
Need to know what surge arrester rating to apply to a 2.4kV winding on a transformer. So would the duty cycle rating be 1.38kV (2.4kV/sqrt3)well a little higher than operating voltage say 3kV or 6kV duty? And would the MCOV rating be 2.55kV or 5.1kV???

thanks,
not used to lower voltages

RE: Surge Arrester Ratings

Wye or delta? Grounded or not?

RE: Surge Arrester Ratings

(OP)
Wye and Grounded, sort of new to this can you shortly explain why that matters? Excuse my ignorance

Thanks!

RE: Surge Arrester Ratings

If solidly grounded then the arrestor needs some margin above the 1.38kV value. If it was ungrounded, then you'd be basing it on the full 2.4kV.

With the solidly grounded system a fault on one phase doesn't raise the voltage to ground on the others, but on an ungrounded (capacitively grounded) system a fault on one phase will cause the phase to ground voltage on the other phases to approach the phase-phase voltage.

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