FIELD: electricity.
SUBSTANCE: invention relates to a three-phase three-leg transformer, with windings connected back-to-back in zigzag. Free leads of the first windings are connected to input terminals, and the free leads of the second windings are connected to one common zero point for connecting of single-phase loads. Booster windings are added to two phases of windings of the three-leg transformer. The automatic phase selector switch is connected also with input lead of the primary winding of the third phase, and also with zero lead of primary windings added to zigzag and output terminals of the normaliser.
EFFECT: increase or decrease of mains voltage of the respective phases and the leads of which are connected to the automatic phase selector switch.
1 dwg
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