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  • Users: mustafaABB
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  1. mustafaABB

    transformers vector group selection

    Hi i have question regarding transformers vector group. why for Generator Transformers are having YNd1 and YNd11 why it dose not be other like YNd5 or YNd7 or else same thing for distribution transformers. I know for connected two transformers in parallel it must be the same vector group but...
  2. mustafaABB

    directional protection

    Hi every body how can set the angle for the directional over current protection , I mean some times we seee angle 90 or 60 or 45 or 30 what is the criteria for selecting the above angles for the directional over cuurnt and even for directional earth fault. i heard from friend he told me that...

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