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Harmonic Analysis

Harmonics are currents and voltages having a frequency that is a multiple of the system fundamental frequency (for example, the third harmonic for a 60 hertz system has a frequency of 180 hertz). These harmonic currents and voltages can adversely affect other components in the power system. A harmonics analysis determines whether harmonic currents and voltages exceed recommended limits as determined by the Institute of Electrical and Electronics Engineers (IEEE) and if remedial actions are necessary, such as tuned harmonic filter banks. The study typically includes on-site harmonic distortion measurements, on-site data collection, power system modeling on a digital computer, analysis and a report with results and recommendations.