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Thread: Delta- Delta transformer

  1. #11
    Join Date
    Aug 2004
    Northern illinois
    You can either ground it or not. It is a design decision. There are ramifications both ways.

    personally, I doubt it makes all that much difference one way or the other, although I have to say grounded 3 phase systems seem to be more common these days than they once were.

  2. #12
    Join Date
    Jul 2006
    San Francisco, CA, USA
    When I worked at a steel mill in the late 70s we were 480V ungrounded delta, because the attitude was "Damn the torpedoes, full speed ahead!" when it came to operating that plant. We had ground lights in the electric shop that told us if there was a ground fault, somewhere. Then we jumped in golf carts to go out and try to find it. The usual sign was a production manager running around like a chicken with it's head cut off, flagging us down because his part of the plant was down and he was going to miss quota and thus, his bonus.
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