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In digital protection systems, discrete Fourier transform (DFT) technique is the most widely used frequency analysis tool for extraction of fundamental and harmonic components of fault currents. However, some fault currents are accompanied by decaying direct current (DC) offset which affects the accuracy of the DFT-based methods as the polluted fault current with decaying DC offset is not a periodic...
Input voltage and current signals measured by digital protective relays during fault conditions may contain oscillatory components with different frequencies as well as transient offset. Most of the relays are using only fundamental frequency component to detect a fault condition, and other components are considered nuisance. The sources of these nuisance components could be transients of instrument...
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