Electrical switching apparatus with digital trip unit and automatic frequency selection
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United States of America Patent
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Jun 27, 1995
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N/A
app pub date -
Sep 30, 1992
filing date -
Sep 30, 1992
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Abstract
A microprocessor based switch such as a circuit breaker generates digital rms representations of analog load currents from n samples of the analog currents per cycle synchronized to the line frequency, where n is an odd integer equal to a selected highest order harmonic to be detected plus 2. A routine determines whether the power system is 50 or 60 Hz, and automatically sets the sampling interval to provide exactly n samples per cycle for the connected source. Terminals for rapidly resetting an analog memory for calibration and field testing of a long delay trip are hidden behind a removable rating plug.
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