Field adjustable phase shifting transformer

Details Field adjustable phase shifting transformer Field adjustable phase shifting transformer

2005-08-16

2005-08-16

Nguyen, Tuyen T (Department: 2832)

Inductor devices

Polyphase

Reexamination Certificate

active

06930578

ABSTRACT:
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 single 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.

REFERENCES:
patent: 4862059 (1989-08-01), Tominaga et al.
patent: 5343080 (1994-08-01), Kammeter
patent: 5434455 (1995-07-01), Kammeter
patent: 5543771 (1996-08-01), Levin
patent: 5977761 (1999-11-01), Bilger et al.
patent: 6169674 (2001-01-01), Owen

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