FIELD-ADJUSTABLE PHASE SHIFTING TRANSFORMER

摘要

A field-adjustable phase shifting transformer apparatus for canceling harmonic currents in a three-phase alternating current (AC) power distribution system includes a primary having a plurality of sets of contact points for receiving power from a three-phase AC power source and a secondary electromagnetically coupled to the primary, the secondary having a shingle set of contact points for connection to a plurality of loads. A phase shift is chosen by selecting one of the sets of contacts for connecting the primary to the AC power source.