High-voltage gas circuit breaker

Abstract

The invention relates to a high-voltage circuit breaker with a blocking ring contact and a vortex generator and belongs to the field of high-voltage electrical technology. The high-voltage circuit breaker comprises a static arc contact, a main spraying nozzle, an auxiliary spraying nozzle, a dynamic arc contact, a blocking ring, the vortex generator and a piston, wherein the main spraying nozzle, the auxiliary spraying nozzle, the dynamic arc contact and the vortex generator are respectively and fixedly connected with the piston to form an arc extinguishing chamber moving part which rightly faces to the static arc contact. The breaking of the arc extinguishing chamber moving part is achieved by means of the driving of a circuit breaker mechanism. A heating channel is formed between the main spraying nozzle and the auxiliary spraying nozzle. According to the high-voltage circuit breaker, the blocking ring contact is used for strengthening air blocking effect between the static arc contact and the main spraying nozzle during arcing, the vortex generator is used for generating swirling airflow to improve mixed effect of the airflow in an expansion chamber, and accordingly, breaking capability of the self-energy circuit breaker is improved.

Description

technical field [0001] The invention relates to a gas circuit breaker in the field of high-voltage electrical technology, in particular to a high-voltage gas circuit breaker with a plugging ring contact and a vortex generator. Background technique [0002] Common high-voltage circuit breakers, especially self-energy circuit breakers, rely on the heat of the arc itself to heat the expansion chamber, generate a sufficiently high air pressure, and then blow out the arc between the contacts through forced cooling when the current crosses zero. Most of the high-voltage self-energizing gas circuit breakers now adopt a dual nozzle channel design, that is, the main nozzle channel made of PTFE on one side, and the channel composed of moving arc contacts and PTFE auxiliary nozzles on the other side. Therefore, the design of the air flow channel is particularly important, especially the blockage effect formed in the nozzle area by arc combustion to heat the expansion chamber and enhanc...

AI Technical Summary

Problems solved by technology

[0004] However, the above technology will weaken the arc blocking effect when the gap between the inner diameter of the main nozzle and the outer diameter of the static contact is large, resulting in the leakage of the air flow before the current crosses zero, which will reduce the breaking performance of the circuit breaker; The air mixing effect during the arc has a great influence on the breaking capacity. Usually, the heating channel with a smooth inner wall is not conducive to the improvement of the air mixing effect, thus affecting the breaking performance of the circuit breaker; third, although the nozzle with grooves is also It can make the air flow produce a rotating effect, but it will increase the flow resistance of the air flow, which is not good for arc blowing, and the processing cost is high, and it will be eroded by high temperature gas and the effect will be attenuated

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