Method of protecting against failure of a circuit breaker

Details Method of protecting against failure of a circuit breaker Method of protecting against failure of a circuit breaker

1997-07-14

1998-10-27

Fleming, Fritz

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

324424, 340638, H01H 7146

Patent

active

058285407

ABSTRACT:
The invention relates to a method of protecting against circuit breaker failure, said circuit breaker having contacts capable of moving between a closed position and an open position, and vice versa, and being fitted with protection apparatus including fault detector apparatus for putting into operation an opening electromagnetic coil that actuates circuit breaker contact drive apparatus, with position-indicator contacts of monitor apparatus being changed over as soon as the circuit breaker contacts start to move. According to the invention, in the event of a fault being detected, a time delay is generated from the indicator contacts changing over, and at the end of said time delay it is verified whether the fault current has become zero, and if not an alarm is generated.

REFERENCES:
patent: 3156848 (1964-11-01), Wood
patent: 4620156 (1986-10-01), Alvin et al.
patent: 5267120 (1993-11-01), Graff et al.

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