Electrical switching apparatus with digital trip unit and automa

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means

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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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patent: 4331999 (1982-05-01), Engel et al.
patent: 4420789 (1983-12-01), Breen
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patent: 5136458 (1992-08-01), Durivage, III
patent: 5159519 (1992-10-01), Cassidy et al.
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.

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