Low power solid state three-phase overcurrent/undercurrent prote

Details Low power solid state three-phase overcurrent/undercurrent prote Low power solid state three-phase overcurrent/undercurrent prote

1975-09-22

1977-02-01

Broome, Harold

317 36TD, 317 49, H02H 326

Patent

active

040063879

ABSTRACT:
Each phase of the power input circuit in a three-phase electrical system is coupled to a sensor by means of a pick-off transformer. Each sensor has an overcurrent detection circuit comprising a slow response filter, an operational amplifier, and a comparator and an undercurrent detection circuit comprising a fast response filter, an operational amplifier and a comparator. A fourth overcurrent detecting sensor is coupled to a selected system feed circuit. A C/MOS logic circuit responds with a "high" state output when any number of sensor network outputs go to the high state. The output of the C/MOS logic circuit is filtered by a slow response filter and is used to trigger an actuating circuit that operates a standby breaker in the system input circuit.

REFERENCES:
patent: 3223891 (1965-12-01), McClymont
patent: 3602776 (1971-08-01), Gonnam
patent: 3699431 (1972-10-01), Paddison et al.
patent: 3742303 (1973-06-01), Dageford
patent: 3783341 (1974-01-01), Beckwith

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