Circuit breaker with solid-state trip unit with a digital proces

Details Circuit breaker with solid-state trip unit with a digital proces Circuit breaker with solid-state trip unit with a digital proces

1986-02-10

1987-08-25

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 87, 364483, H02H 308

Patent

active

046897127

ABSTRACT:
Solid-state trip unit having a unit (29, 50, 48) for digital processing of signals emitted by current sensors (16). The digital processing system provides the long delay, short delay and instantaneous tripping functions and delivers a tripping order to the relay (14). An analog processing unit (70) is connected parallel with the digital processing unit to transmit an instantaneous tripping order to the relay (14). When the digital processing unit operates, the analog unit pick-up level is higher than the digital instantaneous tripping pick-up and this pick-up is reduced to a lower or equal value, if the digital unit is inactive.

REFERENCES:
patent: 4291355 (1981-09-01), Dinger
patent: 4324987 (1982-04-01), Sullivan et al.
patent: 4351012 (1982-09-01), Elms et al.
patent: 4371947 (1983-02-01), Fujisawa
patent: 4377836 (1983-03-01), Elms et al.
patent: 4544982 (1985-10-01), Boothman et al.
patent: 4589052 (1986-05-01), Dougherty

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