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Al Ahyudi, Muhammad (2025) Analisa Koordinasi Over Current Relay (OCR) dan Directional Ground Relay (DGR) Sebagai Proteksi Transformator Gardu Induk Segoromadu Gresik. (Analysis of Coordination of Over Current Relay (OCR) and Directional Ground Relay (DGR) as Protection of Segoromadu Gresik Substation Transformer). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.