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  1. makuku

    Neutral Earthing without transient overvoltages

    Hi Mengho Thank you Mengho for your enquiries. Maybe I should give an overview of this problem. Our utility supplies power to a mine through 4 tranformers, one set is 132/6.6kV 20MVA YNd11 and another set is 132/33kV 25MVA YNyn0.The 33kV transformers are solidly earthed on the HV and LV...
  2. makuku

    Neutral Earthing without transient overvoltages

    Could somebody please assist me with the following problem: I work for a utility and I have a client who needs a modification as follows: To install a neutral earthing resistors on 2 x 25MVA, YNyn0, XHL = 9.7%132/33kV Transformers with a 33kV fault level of 219.57MVA, 3.84kA. Apparently to...

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