Circuit breaker

Abstract

The invention relates to a power switch which comprises, encapsulated together with an insulating gas, at least one substantially radially symmetrical extinction chamber (1) filled with the insulating gas which extends along a longitudinal axis (2) and contains at least two power contacts (5, 6) and an arc quenching chamber (4) associated therewith. The arc quenching chamber (4) is functionally linked with at least one exhaust having an exhaust volume (12), which is adapted to cool the hot gases produced when the switch is switched off. The exhaust is linked with an arc quenching chamber volume (22). The aim of the invention is to substantially improve the arc quenching rate of power switches and to provide an exhaust which is comparatively simple and expensive in design. For this purpose, at least one forced recirculation area (29) increasing the flow resistance of the hot gases is provided in the area of the exhaust.

Description

technical field

[0001] The invention relates to a power switch according to the preamble of claim 1 . Background technique

[0002] A power switch is known from patent document CH 645 753, which can be used in a high-voltage network. This power switch has a rotationally symmetrical arc extinguishing chamber, which uses a negatively charged gas as an arc extinguishing and insulating medium, such as SF 6 full of gas. The quenching chamber has an arc chamber in which the quenching and insulating medium is ionized and heated by the breaking arc burning between the two power contacts. A part of the heated arc extinguishing and insulating medium is discharged through the insulating nozzle into the exhaust volume, where it is cooled by the cooling device and diverted. Mixing of the heated quenching and insulating medium with the cold gas present in the exhaust system can only be achieved to a relatively small extent, since the vast majority of the cold gas is quenched and insula...

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