It has long been recognized that harmonic currents, particularly the 3rd harmonic, flowing in a wye distribution system serving multiple computer loads, are detrimental to system operation. Problems caused by these harmonic currents include: overheated transformers, switchgear and wiring; random circuit breaker tripping; and reduced useable system capacity. Harmonic suppression systems can be installed to eliminate the flow of third harmonic currents. Economic benefits of installing such systems have been estimated in terms of increased capacity, increased component lifetime, and reduced down time. It is now possible to measure the energy savings obtained when excessive harmonic current flow is eliminated in an electrical system. These savings are due to reduced I{sup}2R losses in transformers and wiring and reduced air conditioning costs, This paper will include several case studies illustrating the direct energy savings that can be obtained by installing a harmonic suppression system.
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