Table 3.2.1 Typical Transformer Impedances (Tables (a) and ...

ELECTRICAL POWER SYSTEMS ENGINEERINGT able Typical Transformer Impedances (Tables (a) and (b))reprinted with permission from Electrical Transmission and Distribution Reference Book, ABB Power T&D Co., Raleigh, NC.(a) Standard Reactances and Impedances for Ratings 500 KVA and below (for 60 cycle Transformers).* For three-phase transformers, use 1/3 of the three-phase KVA rating, and enter Table with rated line-to-line voltages.+ Average Reactance in %++Average Impedance in %(b) Standard Range in Impedances for Two-Winding Power Transformers Rated at 55C Rise (Both 25- and 60-cycle transformers.) Table (b) requires definitions of Transformer classes:OA: Oil-immersed, self-cooledOW: Oil-immersed, : Oil-immersed, self-cooled/forced-air-cooledOA/FA/FOA: Oil-immersed, self-cooled/forced-air-cooled/forced-oil -cooledFOA: Oil-immersed, forced-oil-cooled with forced air coolerFOW: Oil-immersed, forced-oil-cooled with water cooler+ High-Voltage Winding Inulation Cla

ELECTRICAL POWER SYSTEMS ENGINEERING Table 3.2.1 Typical Transformer Impedances (Tables (a) and (b)) reprinted with permission from Electrical Transmission and Distribution Reference Book, ABB Power T&D Co., Raleigh, NC. (a) Standard Reactances and Impedances for Ratings 500 KVA and below (for 60 cycle Transformers).

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