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Recent content by Gestur3

  1. Gestur3

    automatic test set for instrument transformers

    Hello IZ5pl, We test CT/VT and protection(OMICRON 356) and control, we used CPC100, for VT it is ok from my perspective(Ratio and polarity) but for CT it takes to much times compared to NDB or CT analyzer. Our customer usually want Polarity, Ratio, megger test, winding resistance, burden and...
  2. Gestur3

    automatic test set for instrument transformers

    Hello Im of the opinion that you should know how to test ct and VT with old school methods. But when testing huge substations it is nice to have automatic test sets. What are the opinion about different test sets? Good experience and of Course problems and limitations. I have tested some...
  3. Gestur3

    Vector Group

    Hello, Have a transformer with Vector group Yd5. Line come in with C-B-A instead of normal A-B-C phase order. On terminal A arrives L3, on B arrives L2 and on C arrives L1. How does this affect the Vector group? Does this transform to Yd7 or Yd1? Or will it remain Yd5? Three engineers and...
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