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  1. ronnie497

    Coil Winding Efficiency

    Bob, You are right in saying that the winding process determines the amount of wire that can fit. As long as the winder conforms to the "layer" winding technique, you can come quite close as follows; Turns per layer = length/OD wire. No of layers = radial hight/OD wire. Total turns = Turns...
  2. ronnie497

    Roebel Generator Bars

    A pity that I was called in at the end of the thing, so no photo's etc. Sorry for the Cu size, blonde moment! It should be 2.8 x 10.8mm. The distribution% comes from an anaylisis of the summed strand locations. 89% says that the strand starting at that position occupies 89% of the bar's...
  3. ronnie497

    Roebel Generator Bars

    The machine design could have been before Roebel? Made by AEI. (Ran for 50 years). They had a straight (2 knuckle) evolute in the NCE with a two knuckle, transposed cross - over evolute in the CE. (Two clips per stack). Worst distribution was 81%, then 87%, 92%, etc. The new...
  4. ronnie497

    Roebel Generator Bars

    Hi Everyone, I have been involved in the post mortem of a 60MVA H2 cooled turbo generator failure. The machine was rewound. Originally it had "straight" bars, overhang clip transpositions. This was to be replaced with 360 deg roebel. Due to space constraints, 180 deg roebel was employed...

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