VOLTAGE BALANCER IN THREE-PHASE NETWORK Russian patent published in 2015 - IPC H02J3/26 

FIELD: electricity.

SUBSTANCE: invention relates to the electrical engineering. The device is intended for improvement of electric energy quality in regard to unbalance level in power networks with voltage of 0.4kV. It eliminates voltage unbalance due to vector subtraction of zero-phase-sequence voltage from voltage for all the three phases; to this end each of three groups of in-series secondary windings of step-down single-phase four-winding transformers with transformer ration equal to three is connected in series to wire of the respective phase so that voltage added to the line is subtracted by geometric vectors from voltage of the respective phases. The device is connected to the line break; it may be used for improvement of electric energy quality both for individual devices and their groups in regard to unbalance level. The balancer consists of three step-down single-phase four-winding transformers (1) with one primary (2) and three secondary (3) windings, input terminals (4), output terminals (5).

EFFECT: simplification of design, improvement of reliability and efficiency.

1 dwg