Electrical transmission or interconnection systems – Anti-induction or coupling to other systems
Patent
1995-07-28
1997-04-08
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Anti-induction or coupling to other systems
307105, 333 12, 333182, H02J 102
Patent
active
056190794
ABSTRACT:
A filter circuit for reducing electromagnetic interference in an ungrounded hree-phase delta electrical system. The filter circuit includes a low- pass filter associated with each power phase having one input and output terminal placing an inductor in series with a phase conductor from a power supply. Input and output capacitors connect to a second input and output terminals respectively. An inductor connects in common between the second input and second output terminals thereby to complete a loop that is isolated from ground. Voltage suppression circuits connect from each phase to ground on the input side of the filter.
REFERENCES:
patent: 3681612 (1972-08-01), Vogl et al.
patent: 4342013 (1982-07-01), Kallman
patent: 4622526 (1986-11-01), Schneider
patent: 4760356 (1988-07-01), Kempster
patent: 5083101 (1992-01-01), Frederick
patent: 5119266 (1992-06-01), Petry
patent: 5136455 (1992-08-01), Billingsley
patent: 5179362 (1993-01-01), Okochi
Stewart David W.
Wiggins Charles L.
Ganjoo Peter
Lall Prithvi C.
McGowan Michael J.
Oglo Michael F.
Shoop Jr. William M.
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