Indian Institute of Technology, Roorkee 15 kV 300 400 kV Autotransformer 220 kV (A) Star - Star (9 =...
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Indian Institute of Technology, Roorkee 15 kV 300 400 kV Autotransformer 220 kV (A) Star - Star (9 = 00) (C) Delta - Star (9 = 300 ) -300 ) (B) Star - Delta (9 = (D) Star — Zigzag