Method for reducing waveform distortion in an electrical utility

Details Method for reducing waveform distortion in an electrical utility Method for reducing waveform distortion in an electrical utility

1995-05-26

1997-09-02

Wong, Peter S.

Electricity: power supply or regulation systems

Including a transformer or an inductor

Polyphase or plural transformers

323356, H01F 3012

Patent

active

056636369

ABSTRACT:
The invention relates to an interference suppression method and circuit for an electrical system, said electrical system comprising a main transformer (2) with a star point (12), phase leg conductors (L1, L2, L3) connected to the transformer (2), a neutral conductor (N) connected to the earth potential (3) and to the star point (12) of the transformer (2), and loads (5) connected between the phase leg conductors (L1, L2, L3) and the neutral conductor (N), said loads being connected to the neutral conductor (N) at connection points (4). In accordance with the invention a bandstop filter (1) tuned at a center frequency 3*f is connected between the star point (12) of the transformer (2) and the connection points (4) of the loads (5).

REFERENCES:
patent: 3794938 (1974-02-01), Boelter
patent: 4257007 (1981-03-01), Brooks et al.

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