Apparatus and method for reducing transient exponential noise in a sinusoidal signal
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United States of America Patent
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Jun 26, 1990
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N/A
app pub date -
Jun 15, 1988
filing date -
Jun 15, 1988
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Expired
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Abstract
The offset in digital samples of the voltages and currents in a power transmission system following a fault is reduced by subtracting a linear approximation of the exponential component of the transient from the magnitude of the samples to extract the sinusoidal component. The slope and initial ordinate value of the linear approximation are derived from simple calculations using pairs of digital samples spaced one-half cycle apart. Compensated values of the digital samples for the first half cycle of the transient are produced within one-half cycle plus one additional sampling interval from fault inception.
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