H - Electricity – 01 – H
Patent
H - Electricity
01
H
H01H 47/00 (2006.01) H02H 3/04 (2006.01) H02H 3/093 (2006.01) H02H 3/00 (2006.01)
Patent
CA 2107260
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 trip memory for calibration and field testing of a long delay trip are hidden behind a removable rating plug.
Engel Joseph Charles
Murphy William John
Saletta Gary Francis
Shimp Alan Burke
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Westinghouse Electric Corporation
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