Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
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.
Lefort Herve
Marmonier Jean
Fleming Fritz
GEC Alsthom T & D SA
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