Answer / k.prakashchandra

With OLTC ,voltage variation is in increments which may not
be the requirement or may affect unit diff relay . When
the required voltage can be obtained by varying excitation
,OLTC is not needed .

I have a current transformer with 1 main reading meter with transformer outside the building and a control panel having 5 CT reading meters with black round coils inside the building. I want to know, A) when current pass through the Transformers, will the current be reduced or be the same and after that B) when current pass through the CT meters with black round coils, will the current be reduced or be the same. C) in the above process will the reading of the main meter be same or different, from the total reading of all the 5 CT meters.

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