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In this video we discuss what to look for in oneline and threeline drawings for transformer protection relays.

We go over the type of current transformer (CT) connections for transformer protection schemes, particularly for transformer differential protection, as well as the effect of delta and wye power transformer connections and how this affects the overall transformer protection scheme.

This video is excerpted from Romero Engineering Company's Power System Protection: Transformer Protection online course. Check out the full course at:
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