Static trip unit for circuit protective devices

Details Static trip unit for circuit protective devices Static trip unit for circuit protective devices

H - Electricity

02

H

348/26

H02H 3/08 (2006.01) G01R 19/252 (2006.01) H02H 3/093 (2006.01) H02H 3/10 (2006.01)

Patent

CA 1085039

ABSTRACT OF THE DISCLOSURE A static trip unit for automatic electric circuit breakers includes an analog to digital converter for converting an analog signal proportional to the magni- tude of current flowing in a distribution circuit to a digital signal having a pulse frequency proportional to the second power of the analog signal. When the analog signal exceeds a preselected threshold level, a binary counter is conditioned to accumulate the digital signal pulse. A decoder monitors the pulse count accumulating in the counter and issues a trip signal when the pulse count reaches a preselected total.

276313

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