Hi John:
> >Y-caps have enough margin to easily withstand
> >the 4300 V dc without damage.
>
> Without immediate failure, no doubt. But such a huge overstress may
> cause latent damage that later results in failure, and, since IEC 60384
> doesn't call for such an over-voltage test, the failure might not be a
> fail-safe failure.
According to my copy of 384 (1996), a Y1
cap is proof-tested at 4000 V ac.
4300 V dc should not be a problem.
However, a Y2 cap is proof-tested at
1500 V ac, and this might be a problem
just as you suggest.
Note that I suggested this overvoltage
not as a production test, but as a type
test during product evaluation -- to
learn the weakest point in the insulation
system. If the cap should fail, then you
know that the cap is the weakest part.
I then remove the cap, and repeat the
test to determine the next weakest link.
Knowing the weakest link in an insulation
system can be quite valuable when a
production problem arises.
Best regards,
Rich
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