Phase shifting transformer with low zero phase sequence impedanc

Details Phase shifting transformer with low zero phase sequence impedanc Phase shifting transformer with low zero phase sequence impedanc

1997-12-08

1999-11-09

Gellner, Michael L.

Inductor devices

Polyphase

336 10, 336 12, H01F 3012, H01F 3014

Patent

active

059822627

ABSTRACT:
A phase shifting transformer or autotransformer for a three phase power distribution network in which selected outputs have a low zero phase sequence impedance. At least one low zero phase sequence impedance output is fed by a plurality of windings distributed amongst the three core legs such that the number of turns of windings generating a flux in the positive direction is substantially equal to the number of turns of windings generating a flux in the negative direction. Thus, according to the invention, the transformer may be provided with any necessary phase shifting angles between different harmonic sources, with some or all outputs having a low zero phase sequence impedance to reduce voltage distortion created by zero phase sequence harmonics.

REFERENCES:
patent: 5206539 (1993-04-01), Kammeter

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