Harmonic Spectrum Measurement Principles based on Digital Fault Recorder (DFR) Analysis

K. Musasa, W.M. Siti, and J.A. Jordaan (S. Africa)


Digital Fault Recorder, Fast Fourier Transform, signal harmonic


Advances in semiconductor technology have resulted in an escalation in the numbers and power ratings of non linear loads connected to the power system. At all current levels, equipment is being installed which generates harmonics.A Digital Fault Recorder (DFR) System built upon the integrated busescontrol system is a highly effective tool for analyzing substation events. The fault recorder includes acomputer monitor, keyboard, and mouse for viewing real time waveforms, and reading fault recorder status. This paper introduces a simple software package based on FFT, especially forspectrum analysis and tracking ofsignal harmonics. Fast Fourier Transform (FFT) provides an alternate way of representing the signal by how much information is contained at different frequencies.

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