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US5343080: Harmonic cancellation system

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Filing Information

Inventor(s) John B. Kammeter ·
Assignee(s) Power Distribution, Inc. ·
Attorney/Agent(s) Bacon & Thomas ·
Primary Examiner Jeffrey A. Gaffin ·
Application Number US8196813
Filing date 02/14/1994
Issue date 08/30/1994
Predicted expiration date 11/15/2011
U.S. Classifications 307/105  · 336/5  ·
International Classifications H02J 301  ·
Kind CodeA
International Classifications 30717;85;105 ·
Related U.S. Application DataThis application is a continuation of application Ser. No. 07/992,061, filed Dec. 16, 1992 now abandoned, which is a continuation-in-part of U.S. application Ser. No. 07/792,893, filed Nov. 15, 1991, now U.S. Pat. No. 5,206,539 issued Apr. 27, 1993.
27 Claims, No Drawings


Abstract

A harmonic current filtering transformer includes a three-phase input winding and at least two wye-connected three-phase output windings. The output windings are phase shifted relative to each other by an amount which causes harmonic currents generated by a non-linear load to magnetically cancel in the transformer core.

Independent Claims | See all claims (27)

  1. 1. A harmonic cancellation system, comprising:an input power source;at least one transformer core;a three-phase primary winding inductively coupled with said core and connected to said power source;at least two three-phase wye-connected output windings inductively coupled with said core, wherein said output windings are phase-shifted relative to each other to cause magnetic flux vectors generated in said core by harmonic currents present in the output windings to add to zero for respective orders of selected harmonic currents and thereby prevent the selected harmonic currents present in the output windings from being induced in said input windings; anda load connected to said output windings.
  2. 18. A harmonic cancellation system, comprising:an input power source;at least one transformer core;a three-phase primary winding inductively coupled with said core and connected to said power source;at least two three-phase wye-connected output windings inductively coupled with said core, wherein said output windings are phase-shifted relative to each other to cause magnetic flux vectors generated in said core by harmonic currents present in the output windings to partially cancel for respective orders of the selected harmonic currents to thereby prevent the selected harmonic currents present in the output windings from being induced in said input windings; anda load connected to said output windings.

References Cited

U.S. Patent Documents

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Foreign Patent Documents

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