Static trip circuit breaker with automatic circuit trimming

Details Static trip circuit breaker with automatic circuit trimming Static trip circuit breaker with automatic circuit trimming

H - Electricity

02

H

348/26

H02H 3/08 (2006.01) G01R 19/25 (2006.01) H02H 3/00 (2006.01)

Patent

CA 1283474

STATIC TRIP CIRCUIT BREAKER WITH AUTOMATIC CIRCUIT TRIMMING ABSTRACT OF THE DISCLOSURE Electronic trip units employed within static trip circuit breakers are individually calibrated and automatically adjusted to ensure that the trip transfer characteristics are within specification requirements. A trimming network within the trip unit circuit contains a plurality of parallel resistors each separately connected within the circuit by means of a fusible link. Test input and output values are compared to idealized values that are binary-weighted within a look-up table in the test equipment computer. The percent correction required is determined and the appropriate links are interrupted to provide ideal trip response.

533822

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