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이종훤(Jong-Hweon Lee),정우중(Woo-Joong Jung),신성식(Seong-Sik Shin),이형(Hyung Lee),신창균(Chang-Gyun Shin) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
This paper analyzes operation sensitivity of a relay, a blind spot of differential protection relaying, and how to protect the blind spot in protective relying of 3φ Y-Delta transformer consisting of three 1φ transformers which Korean pumped storage power plants have been using. Each different protective relayings must be adopted because there are differences between 3φ trans-former and 3φ transformer consisting of three 1φ trans-formers. Also, in the system using high resistance grounding for fault current restriction of delta side, protection for delta side faults have to be considered properly.