Quote:
Originally Posted by Philip Fisher
I get the impression we don't operate in such a high voltage range as quoted above but will be interested to check
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There's a difference between what devices are required to accept, and that's frequently +/- 10% today, used to be -6/+10% yesterday, compared to which tolerances an electricity provider aims at working with.
To be able to keep within +/- 10% at the final end of the wire you have to aim for a tighter tolerance out from the transformers.
Normally the frequency tolerances are much more important to keep. The aim is usually to be better than +/- 1%, although insensitive devices can typically handle +/- 4%.