# Transformer differential protection design

May 14th, 2015
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(a) Transformer winding and CT connection diagram(with phasor diagrams); CT ratios for the HV and LV side: The primary side of the CT is connected âˆ† form; the secondary side of the CT is Y form. HV side:

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467 2 Part 1.Transformer differential protection design(a) Transformer winding and CT connection diagram(with phasor diagrams);CT ratios for the HV and LV side:The primary side of the CT is connected form; the secondary side of the CT is Y form. HV side:==115.47A=115.47A.LV side:==962.25AChoose Protections relay settings:(a) should be at least 5 times the full load spill current;(b) Assume biasing factors and =1.4;(c) Assume current setting ;If the transformer tap changer is +15%:If the transformer tap changer is -15%:==136A=0.166AChoose 0.85A.is the transformer nominal current referred to the CT secondary side. ==135.85A==110AChoose the largest one.Choose 1.10A.Part2.Transformer differential protection operationIn transformer HV side, CT converts to secondary side== (A)== (A)== (A)In transformer LV side, CT converts to secondary side== (

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