High-voltage circuit breaker with improved circuit breaker rating

An electrical breaker device for an electrical power supply system, comprising:

• a breaker chamber which is surrounded by a breaker chamber housing and has an arc-quenching zone and an exhaust volume for-cooling hot quenching gas, wherein an exhaust region of the exhaust volume is filled with cold gas at the beginning of a switching operation, wherein means for splitting the hot quenching gas up into at least two partial gas flows are provided,
• wherein a) an intermediate storage volume for storing cold gas is arranged in the exhaust region, b) a first means is present which guides the first partial gas flow into the breaker chamber housing whilst bypassing the intermediate storage volume, and c) a second means is present which guides the second partial gas flow towards the stored cold gas and, as a result, causes a displacement of the stored cold gas out of the intermediate storage volume,
• wherein d) a mixing zone is provided in the region of an outlet opening of the intermediate storage volume for mixing the first partial gas flow with the cold gas such that the first partial gas flow and the intermediately stored cold gas are mixed with one another before flowing off into the breaker chamber housing, and
• wherein e) a mixing channel is arranged downstream of the mixing zone and upstream of the inlet into the breaker chamber housing, and f) in the mixing channel additional mixing of the first partial gas flow with the cold gas, which has been forcibly displaced out of the intermediate storage volume, and with a precooled second partial gas flow and a further partial gas flow takes place.

A method for cooling a quenching gas in an electrical breaker device for electrical power supply systems, in a high-voltage circuit breaker, the breaker device comprising:

• a breaker chamber which is enclosed by a breaker chamber housing, wherein in the event of a switching operation hot quenching gas flows from an arc-quenching zone to an exhaust region which is filled with cold gas, wherein the hot quenching gas is split up into at least two partial gas flows,
• wherein a) at least part of the cold gas is intermediately stored in the exhaust region, and the first partial gas flow is guided to bypass the intermediately stored cold gas and flows off into the breaker chamber, and b) with the aid of the second partial gas flow, the intermediately stored cold gas is forcibly displaced out of the exhaust region,
• wherein c) gas jets in an area of first partial gas flow and in an area of the cold gas are directed towards one another in the region of a mixing zone, and, as a result, the first partial gas flow and the cold gas are mixed, and
• wherein d) a mixing channel is present downstream of the mixing zone and upstream of the inlet into the breaker chamber housing, and e) the first partial gas flow is additionally mixed in the mixing channel with the intermediately stored cold gas and with a precooled second partial gas flow and a further partial gas flow.

An electrical breaker device for an electrical power supply system, comprising:

• a breaker chamber which is surrounded by a breaker chamber housing and has an arc-quenching zone and an exhaust volume for cooling hot quenching gas, wherein an exhaust region of the exhaust volume is filled with cold gas at the beginning of a switching operation, wherein means for splitting the hot quenching gas up into at least two partial gas flows are provided,
• wherein a) an intermediate storage volume for storing cold gas is arranged in the exhaust region, b) a first means is present which guides the first partial gas flow into the breaker chamber housing whilst bypassing the intermediate storage volume, and c) a second means is present which guides the second partial gas flow towards the stored cold gas and, as a result, causes a displacement of the stored cold gas out of the intermediate storage volume,
• wherein d) a mixing zone for mixing the first partial gas flow with the cold gas is provided in the region of an outlet opening of the intermediate storage volume, jet-forming means for having gas jets in an area of the first partial gas flow and in an area of the cold gas are provided, and the mixing zone serves as a swirling zone for the gas jets of the first partial gas flow and the cold gas, and
• wherein e) a mixing channel is arranged downstream of the mixing zone and upstream of the inlet into the breaker chamber housing, and f) in the mixing channel additional mixing of the first partial gas flow with the cold gas, which has been forcibly displaced out of the intermediate storage volume, and with a precooled second partial gas flow and a further partial gas flow takes place.