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## Sinusoidal-wave-based algorithms

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The algorithms covered in this Chapter assume that the post-fault current and voltage waveforms are sinusoidal. This assumption is not, of course, generally valid, particularly when EHV or UHV network applications are involved. However, in practice, the signals processed are often prefiltered and, in lower voltage distribution systems in particular, the waveforms often very quickly attain a nominally sinusoidal form.

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