Why do we apply both Differential and REF (HV and LV)
protection schemes on YNyn configuration of a transformer?
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Answer Posted / Dhirendra Shukla
Applying both differential protection and REF (Restrike Electrical Fault) protection schemes on the YNyn configuration of a transformer serves to provide comprehensive fault coverage. Differential protection ensures rapid isolation of the faulty winding, while REF protection offers additional protection against re-strikes after primary protection operation or during system restoration.
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