Method for reducing waveform distortion in an electrical utility system and circuit for an electrical utility system
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United States of America Patent
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Sep 2, 1997
Issued Date -
N/A
app pub date -
May 26, 1995
filing date -
May 26, 1994
priority date (Note) -
In Force
status (Latency Note)
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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).
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