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Transformer Question No. 19 – Power transformer vector group

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  • #267
    Arash

      How do the transformer vector group influence on permissible neutral loading and level of system ground fault currents?
      How do the transformer vector group influence on permissible neutral loading and level of system ground fault currents?

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    • #1520
      Hamid

        The three phases of transformer windings can be arranged in star – , delta – or zigzag -connection. The vector group (star: Y or y; delta: D or d; zigzag; Z or z) is indicated on the transformer

        #1616
        R K Mohapatra

          For a 3 phase core type power transformer the Zero sequence impedence is normally 65-75 % of the positive sequence impedence at a workinf flux density of 1.6 Tesla .

          #1617
          R K Mohapatra

            The ratio of Zero sequence impedence to Positive sequence impedence is around 0.7 for a 3 phase core type power transformer with working Flux density 1.6 Tesla .

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