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  1. Sathyajith

    Site power- Delta Star Isolation Transformer

    Hi All Thanks heaps for the answers. Inrush current could be a good reason, We tried without the star side earth and tried to energise, then the CB does not trip ? Few more info: Supply MCCB is 80 A Rated, 3 pole breaker ( no realy..etc is connected, and no setting for the CB) Transformer...
  2. Sathyajith

    Site power- Delta Star Isolation Transformer

    Hello, I'm in a situation where a Delta Star Isolation Transformer is used to get 400V power from a HV Substation(Temporary construction works). Secondary star side is earthed (MEN/Neutral link). Attached a sketch on the arrangement. The Supply side Circuit breaker (CB feeding primary side)...

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