Static trip unit for circuit protective devices

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

1976-04-19

1977-07-26

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 42, 361195, H02H 308

Patent

active

040386953

ABSTRACT:
A static trip unit for automatic electric circuit breakers includes an analog to digital converter for converting an analog signal proportional to the magnitude 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.

REFERENCES:
patent: B288627 (1975-01-01), Cuzzo
patent: 3040273 (1962-06-01), Boff
patent: 3179850 (1965-04-01), Mathews
patent: 3317795 (1967-05-01), Steen
patent: 3328724 (1967-06-01), Way
patent: 3329870 (1967-07-01), De Viney
patent: 3419757 (1968-12-01), Steen
patent: 3449695 (1969-06-01), Marsh
patent: 3654519 (1972-04-01), South
patent: 3831061 (1974-08-01), Boyd
patent: 3942110 (1976-03-01), Milkovic
Electronic Design, 12, (6/7/74).
Electronic Design, 23, (12/8/73).

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