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Method and apparatus for reducing the harmonic currents in alternating-current distribution networks

United States Patent

*** EXPIRED ***
5,576,942
November 19, 1996
View the Complete Patent at the US Patent & Trademark Office
Fermi National Accelerator Laboratory - Visit the Office of Research and Technology Applications Website
An improved apparatus and method reduce the harmonic content of AC line and neutral line currents in polyphase AC source distribution networks. The apparatus and method employ a polyphase Zig-Zag transformer connected between the AC source distribution network and a load. The apparatus and method also employs a mechanism for increasing the source neutral impedance of the AC source distribution network. This mechanism can consist of a choke installed in the neutral line between the AC source and the Zig-Zag transformer.
Beverly; Leon H. (Lockport, IL), Hance; Richard D. (Elburn, IL), Kristalinski; Alexandr L. (Naperville, IL), Visser; Age T. (Geneva, IL)
Universities Research Association, Inc. (Washington, DC)
08/ 316,634
September 30, 1994
This invention was made with Government support under Contract No. DE-AC02-76CH03000, awarded by the United States Department of Energy. The Government has certain rights in the invention.