Auto ยท 400/220 kV interconnecting ยท YNa0(d) ยท series + common winding share one magnetic circuit ยท buried delta tertiary
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Click any part to identify it. An autotransformer shares one winding between HV and IV โ that is why it is smaller and cheaper than a two-winding unit at close ratios, but offers no galvanic isolation.
๐ฑ drag = orbit ยท wheel = zoom ยท right-drag = pan ยท click = identify The IV terminal taps the junction of the common and series windings โ HV = series + common in series.