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Recent content by BAHADIR AKBAL

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    Phase-earth fault in YNd11 step-up transformer while operating at no load

    In these cases, I think the protection relay opens immediately. However, approximately 20 minutes after the power is applied, the protection relay opens the breaker. 20 minutes is a very long time in such cases. Could there be another reason?For example, a partial discharge in a cable. Can this...
  2. B

    Phase-earth fault in YNd11 step-up transformer while operating at no load

    Hello everyone There is a YNd11 step-up transformer in a factory. When the star point of the transformer is grounded, the protection relay gives a phase ground fault approximately 20 minutes later. The same problem occurs when the delta winding of the transformer is completely unloaded. The star...
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