Electrical circuit breaker with self-extinguishing expansion and insulating gas
First Claim
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1. A self-extinguishing expansion electrical circuit breaker including a sealed enclosure filled with a high dielectric strength insulating gas, and housing one or more pole-units, each of the pole units comprising:
- a first extinguishing chamber disposed within the enclosure for storing insulating gas;
a pair of arcing contacts disposed in said first chamber which are axially translatable with respect to each other and define a breaking gap therebetween when separated in which an arc is formed;
a tubular gas outflow duct arranged inside at least one of said contacts for communicating said first chamber with a second chamber formed by a remaining volume of the enclosure disposed around said first chamber; and
guiding means arranged on an interior of the duct for opposing Vortex-effect swirling gas flow therethrough.
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Abstract
An inside of tubular contacts of a self-extinguishing expansion SF6 -gas circuit breaker including guiding ribs arranged to oppose any vortex-effect swirling gas flow between a first extinguishing chamber and a second expansion chamber. The presence of these ribs improves the dielectric withstand of the circuit breaker, and prevents any arc restriking inside the contacts.
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Citations
7 Claims
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1. A self-extinguishing expansion electrical circuit breaker including a sealed enclosure filled with a high dielectric strength insulating gas, and housing one or more pole-units, each of the pole units comprising:
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a first extinguishing chamber disposed within the enclosure for storing insulating gas; a pair of arcing contacts disposed in said first chamber which are axially translatable with respect to each other and define a breaking gap therebetween when separated in which an arc is formed; a tubular gas outflow duct arranged inside at least one of said contacts for communicating said first chamber with a second chamber formed by a remaining volume of the enclosure disposed around said first chamber; and guiding means arranged on an interior of the duct for opposing Vortex-effect swirling gas flow therethrough. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification