Protective relay with improved, sub-window cosine filter
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United States of America Patent
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Jan 9, 2001
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N/A
app pub date -
Apr 15, 1998
filing date -
Apr 15, 1998
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Abstract
As a variation of the non-orthogonal filter, a phasor estimate is computed by using an N-point window. An aspect of the sub-window cosine filter is to repeat the basic cosine filter for only selected points of the window. In the end, a least-squares fit is used to obtain an estimate for the phasors components. Previous cosine techniques use a data window whose length is greater than 1 cycle while the present invention requires only 1 cycle.
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