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电力系统设计 外文文献
DESIGNING MODERN ELECTRICAL SYSTEMS
WITH TRANSFORMERS THAT INHERENTLY
REDUCE HARMONIC DISTORTION
IN A PC-RICH ENVIRONMENT
by
Philip J. A. Ling, P.Eng.
Cyril J. Eldridge, B. Sc.
POWERSMITHS INTERNATIONAL CORP
416-439-1077
ABSTRACT
Generally, the electrical community has come to accept the fact that todays office facilities have
an abundance of electronic equipment that produce harmonics. Based on the results of hundreds
of electrical system surveys we have determined that the predominant harmonics are triplens;
however, a high degree of 5th and 7th harmonics are also present and need to be treated for a
more comprehensive solution. These harmonic rich environments are known to cause serious
operational problems for users as well as building maintenance personnel. Until recently, no cost-
effective methods have been proposed that can universally deal with 3rd, 5th and 7th harmonics
during the design and specification stage of three phase four wire electrical distribution systems.
By integrating phase shifting into an extremely low zero phase sequence impedance transformer
with single or multiple outputs, substantial reduction of triplen, 5th and 7th harmonics can be
achieved. The net result is that the electrical distribution system predictably becomes
electromagnetically compatible with the electronic loads (e.g. personal computers) it has to
supply.
1. INTRODUCTION
Traditional electrical system design had very little need to deal with harmonics because the loads
typically designed for were linear in nature. Over the years, as more and more research and
practical experience was gathered with linear loads, the design process became more and more
predictable. With the proliferation of variable speed drives, electronic ballasts, personal computers
and other electronic equipment, electrical system design strategies need to be adjusted. Because in
many cases a major portion of the loads today
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