Ah,  this 13KV / 11KV stuff is kid's stuff...

I do some work for the Robert Moses Niagara Power Project at Niagara Falls.
The plant contains 13 large hydroelectric generators with capacities
approaching 200MW each. Each generator has an associated transformer
adjacent to it that steps up the 13KV from the generator to 115KV or 220KV
before sending the power to the switchyard. The transformers are in
partially enclosed concrete bays, with a large hole in the top of the
enclosure.

One day a company was contracted to recaulk all the joints in the concrete.
A laborer was working on top of one of the transformer bays and needed to
get from one corner to another. As we walked across he didn't realize it,
but his extension cord dropped down on top of the 115KV bus in the
transformer bay.

Bang... and a hugh plasma ball comes rolling out of the transformer bay.

Believe it or not the guy with the extension cord was ok (tho' he may have
needed a clean pair of short). Another tech was working down below and was
knocked on his backside.

The extension cord basically disappeared, as did the powerline that fed it.
It even evaporated a good length of the conduit feeding the outlet.

Bob Ammerman
RAm Systems

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