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Case Studies: Harmonic Distortion of Current

Harmonic Distortion of Current

Office building with personal computers, terminals, copiers and other electric office equipment supplied by three-phase wye service. Facility engineers at this site experienced repeated problems with the failure of electrical distribution equipment. A distribution transformer overheated and failed, circuit breakers were tripping and electrical connectors were burning out. These problems are all symptomatic of overload conditions. However, initial measurements of phase currents using a true RMS ammeter showed current readings of 257 to 298 amps. These values did not exceed equipment ratings.

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