On Wed, 1 Oct 2003 09:07:47 +0100, Andy Wade wrote:
Probably not there will almost certainly be more than one way of
feeding the area. By closeing normally open switches and opening
normally closed ones there will be no supply interuption but the kit
they are working on will not be live.
Dave. pam is missing e-mail
changeover. The incoming 11kV feed came via some sort of switchgear which
isolated the transformer from its feed. They removed the cable between the
dead side of the switch and the transformer. Then they removed the 3-phase
415v feeds from the transformer LV side. Along came the crane, winched out
the old transformer, dropped the new one in, put a new red cable in from the
switch to the HV side of the new transformer and re-connected the LV side.
Then they energised the transformer by throwing the switch but we were still
back fed, then they removed the back feed by inserting some fuse links on
the LV side which I think meant we were effectively fed by both transformers
simultaneously, then they went round the corner to the other transformer and
removed some links.
Whilst we were back fed, we were getting about 230volts, but when the fuse
links were re-instated, it jumped up to 244volts.
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