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Reply To: Protection Riddle No.12 – Inability of Earth fault protection system

#1296
V.K. Nambiathiri

    In auto-transformer there is single winding only. Neutral is common. Hence any E/F current in load side shall not return to neutral of aoto- transformer, but flow to neutral of transformer feeding the auto – transformer. Hence NCT placed in neutral of auto- transformer does not sense this fault current