GSU · 420 / 21 kV · YNd1 · star HV to the line (neutral earthed) · delta LV to the generator · off-circuit taps
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Click any part to identify it. A GSU is a two-winding power transformer: the generator feeds the low-voltage delta; the star HV (neutral earthed) feeds the transmission line.
🖱 drag = orbit · wheel = zoom · right-drag = pan · click = identify Delta LV (generator, high current) → star HV (line). The generator's AVR regulates voltage, so a GSU usually has only off-circuit taps.