SF.sub.6 circuit breaker having an incorporated capacitor

Details SF.sub.6 circuit breaker having an incorporated capacitor SF.sub.6 circuit breaker having an incorporated capacitor

1991-10-24

1993-11-30

Scott, J. R.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200148R, 200148A, H01H 3316, H01H 3388

Patent

active

052667588

ABSTRACT:
A high tension circuit breaker includes a gastight cylindrical insulating case filled with SF.sub.6 gas or the like and defining for each phase at least one current interrupting chamber. A fixed main contact and a fixed arcing contact are fixedly mounted within the chamber. Moving equipment of the circuit breaker includes moving main and arcing contacts and a member for moving the moving main and arcing contacts towards and away from the fixed main contact and the fixed arcing contact. A cylinder is fixedly mounted in said chamber and supports internally a movable blast piston and terminates in a blast nozzle facing the fixed contacts. A capacitor is disposed inside the circuit interrupting chamber optionally with a parallel connected varistor. A mechanism in the form of a switch including a fixed and a movable contact operates to insert the capacitor and the parallel connected varistor temporarily during both closing and opening of the circuit breaker contacts. The capacitor is constituted by a stack of capacitor components disposed in a fixed insulating tube mounted within the chamber. A first end of the stack is electrically connected to a first current terminal of the circuit breaker, and a second end of the stack is electrically connected to an electrode fixed to a piece of the moving equipment and electrically connected to a second current terminal of the circuit breaker. The electrode may be a tube coaxial with the case and internally of the case.

REFERENCES:
patent: 4204101 (1980-05-01), Dethlefsen
patent: 4383150 (1983-05-01), Cromer et al.
patent: 4421962 (1983-12-01), Thuries et al.
patent: 4880946 (1989-11-01), Thuries et al.
patent: 4983791 (1991-01-01), Thuries et al.
patent: 5124872 (1992-06-01), Pham et al.
French Search Report, 11 Jun. 1991.

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