Summary: On March 25, 2009, Y-W Electric Association, Inc. (Y-WEA) and Tri-State Generation and Transmission Association, Inc. (Tri-State) requested an interpretation of the term "transmission Protection System" as used in requirements R1 and R3 of PRC-004-1 and requirements R1 and R2 of PRC-005-1. Specifically, the interpretation seeks to clarify whether protection for a radically-connected transformer protection system energized from the BES is considered a transmission Protection System and is subject to these standards.
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