Why Nutral CT rating for Earth Fault Protection of Transformer neutral shall be

Why Nutral CT rating for Earth Fault Protection of Transformer neutral shall be 20% of Full load Current of Transformer

Question Posted / helsaelectrics

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Why Nutral CT rating for Earth Fault Protection of Transformer neutral shall be 20% of Full load Cur..

Answer / k.prakashchandra

To allow for unbalanced load.

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Why Nutral CT rating for Earth Fault Protection of Transformer neutral shall be 20% of Full load Cur..

CT rating is the same as that of line CTs .Only the relay
setting for earth fault is 20 % of OCR

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0 No

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