Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1992-09-30
1995-06-27
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 93, 307129, 324520, 324 7611, H02H 326, H01H 4720
Patent
active
054284953
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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Purkajastha et al., RMS Digital Trips Offer Increased Accuracy & Reliability Advances in Low Voltage Circuit Breaker Trip Technology, 35th Petroleum & Chemical Industry Conference, Dallas Texas, Sep. 12-14, pp. 157-163. 1988.
Engel Joseph C.
Murphy William J.
Saletta Gary F.
Shimp Alan B.
Eaton Corporation
Leja Ronald W.
Moran Martin J.
Pellinen A. D.
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