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

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.
 [1];  [2];  [3];  [4]
  1. (Lockport, IL)
  2. (Elburn, IL)
  3. (Naperville, IL)
  4. (Geneva, IL)
Issue Date:
OSTI Identifier:
Universities Research Association, Inc. (Washington, DC) FNAL
Patent Number(s):
US 5576942
Contract Number:
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Country of Publication:
United States
method; apparatus; reducing; harmonic; currents; alternating-current; distribution; networks; improved; reduce; content; line; neutral; polyphase; source; employ; zig-zag; transformer; connected; network; load; employs; mechanism; increasing; impedance; consist; choke; installed; improved apparatus; source distribution; line current; current distribution; method employ; method reduce; distribution network; distribution networks; /363/323/