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US5977761A - Three-phase transformer with in phase ... the case of a three-phase transformer which, per phase (U, V, W), has a primary-side winding (U PW, V PW, W PW ) and a secondary-side winding (U SW, V SW, W SW ), in-phase regulating windings (U L, V L, W L ) are provided on each limb per phase (U, V, W). These in-phase regulating windings (U L, V L, W L ) serve, by means of a tap switch 3 and a load switch 6, for in-phase ...

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