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Reply To: Protection Question No.35 – Transformer secondary side protection from primary

#1589
Abdul Hameed Pathiyil

    The protection at transformer primary-delta side will protect the E/F at secondary-star side also. Only thing, the current seen by the relay at primary(D) will exclude the zero seq current. that is the current in primary-delt widing is 2/3 part and in the phase connection of primary side ?3 * 2/3 = 1.15. So I think the relay at primary-delta widning protect secondary for E/F at secondary-star also.