Circuit breaker with digitized solid-state trip unit with invers

Details Circuit breaker with digitized solid-state trip unit with invers Circuit breaker with digitized solid-state trip unit with invers

1986-02-10

1988-01-05

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

364 50, 364483, H02H 308

Patent

active

047179856

ABSTRACT:
Microprocessor-based digital solid-state trip unit (48) generating an inverse time long delay and/or short delay trip by digital simulation of the heating and cooling of a bimetallic strip. A digital value (TETALR), stored in a RAM memory simulates the temperature of the bimetallic strip, this value being incremented when the current exceeds a preset pick-up (ILR) or on the contrary decremented if the current is lower than this pick-up (ILR). Tripping is caused when the stored value (TETALR) exceeds a maximum pick-up (TETAMAX). The microprocessor (48) computes the incrementation factor (DTETAE) in terms of the square of the current.

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: 4432031 (1984-02-01), Premerlani
patent: 4544982 (1985-10-01), Boothman et al.
patent: 4589052 (1986-05-01), Dougherty

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