Solid-state trip unit of an electrical circuit breaker with cont

Details Solid-state trip unit of an electrical circuit breaker with cont Solid-state trip unit of an electrical circuit breaker with cont

1987-07-24

1988-10-25

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 96, 361 97, 324424, 340638, H02H 600

Patent

active

047807865

ABSTRACT:
A digital solid-state trip unit of an electrical circuit breaker is equipped with an electrical contact wear indicator enabling the degree of wear of these contacts to be known. Each time the circuit breaker performs a break, the microprocessor determines a contact wear value, in terms of the maximum value of the current broken. The correspondence between the wear value and the current broken is stored in a ROM memory and the successive wear values are added in a NOVRAM memory whose contents are representative of the degree of contact wear. These contents can be displayed to indicate to the user that the condition of the contacts has to be checked.

REFERENCES:
patent: 4527214 (1985-07-01), Hattori et al.
patent: 4550360 (1985-10-01), Dougherty
patent: 4620156 (1986-10-01), Alvin et al.
patent: 4670812 (1987-06-01), Doerfler et al.

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