Circuit breaker with digitized solid-state trip unit with...

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

H - Electricity

02

H

348/26

H02H 3/093 (2006.01) H02H 6/00 (2006.01)

Patent

CA 1244929

Abstract CIRCUIT BREAKER WITH DIGITIZED SOLID-STATE TRIP UNIT WITH INVERSE TIME TRIPPING FUNCTION Microprocessor-based digital solid-state trip unit (48) generat- ing an inverse time long delay and/or short delay trip by digit- al 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 incremen- ted 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) ex- ceeds a maximum pick-up (TETAMAX). The microprocessor (48) computes the incrementation factor (DTETAE) in terms of the square of the current. Refer to figure 8.

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