Meeting IEEE 519- 1992 Harmonic Limits Using HarmonicGuard® Passive Filters Written By: John F. Hibbard Michael Z. Lowenstein Abstract With the advent of IEEE 519-92, the increasing demand by utilities for power factor improvement, and the proliferation of non-linear loads in industrial power distribution systems, specification of harmonic mitigation has become common. Questions arise regarding the performance of passive harmonic trap filters in removing harmonic distortion. Data from a number of TCI HarmonicGuard® trap filter installations have been collected which illustrate how closely IEEE 519-92 limits can be met. HarmonicGuard® filters have been installed, both for power factor improvement and to meet harmonic distortion limits based on IEEE 519-92. A computer model has been developed to help predict the harmonic reduction that can be expected for specific load-filter combinations and the model has been verified with field data. This paper outlines and explains the computer model and details the application of harmonic trap filters. Computergenerated design curves are provided which can be used by a system designer to predict success in meeting harmonic specifications using HarmonicGuard® trap filters.