To meet the requirements of rapid cut-off and protection of modern power grids

SF

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high-voltage circuit breakers are the main type of line protection devices

and their arc-extinguishing performance needs to be strengthened. Aiming at the reaction time difference of the current self-energizing SF

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high voltage circuit breaker during arc extinguishing

we proposed a new type of an arc-extinguishing chamber structure with piston-assisted air dual-energy SF

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high-voltage circuit breaker;moreover

taking the structure as a research object

on the basis of analyzing the formation and arc extinguishing mechanism of the dual-energy strengthenin

g airflow

we established an airflow field model and arc model of the arc-extinguishing process. The Fluent software was used to simulate the temperature field of the arc-coupled airflow during the arc-enhanced airflow interception arc. The simulation results show that the dual-energy arc-extinguishing chamber structure proposed in this paper can extinguish the power-frequency arc within 5 ms when it is applied to the 110 kV voltage level for arc extinguishing

and can effectively suppress the secondary arcing between the arc contacts in the subsequent time. The arc extinguishing chamber structure can continue to maintain a cold airflow in the arc extinguishing passage after the arc is extinguished

and can quickly reduce the arcing residual temperature in the thermal expansion chamber. The research results in this paper can provide a technical reference for improving the breaking capacity of SF

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high voltage circuit breaker.