Motion simulation method used for free valve plate in gas circuit breaker

Abstract

The invention discloses a motion simulation method used for a free valve plate in a gas circuit breaker. The method comprises the steps of determining fluid and solid regions in a space of an arc extinguishing chamber of the circuit breaker and opening and closing positions of the free valve plate, modeling the arc extinguishing chamber and the valve plate, and converting a circuit breaker productstructure into a gas flow field computing model; performing mesh division processing on arc extinguishing chamber and valve plate models of the circuit breaker, matching a relationship between the opening and closing positions of the valve plate and the mesh width, and establishing a gas flow field simulation equation set; importing an action criterion PF of the valve plate and an action threshold +/-delta% of the valve plate to the computing model and the gas flow field simulation equation set for performing simultaneous solving of the equation set; performing dynamic simulation of a gas flow field according to the simultaneous solving, monitoring stress conditions of two side surfaces of the valve plate in real time, determining an action trend of the valve plate according to the actioncriterion PF and the action threshold +/-delta%, and by adopting mesh fluid and solid attribute replacement and valve boundary replacement technologies, realizing opening and closing motion simulation of the valve plate. The simulation precision is high; the universality is high; and the motion simulation of the valve plate is more effective.

Description

Technical field [0001] The invention relates to the motion simulation of the valve plate of a gas circuit breaker, and is particularly suitable for the motion simulation when the valve plate is not equipped with a spring, in particular to a motion simulation method for a free valve plate in a gas circuit breaker. Background technique [0002] With the development of computer technology and numerical calculation methods, the simulation of airflow field has become an important method and means to assist the structural design of high-voltage circuit breakers. From the calculation of the no-load cold air flow field to the simulation of the hot air flow field of the breaking arc, researchers at home and abroad have done a lot of research work. [0003] In China, Professor Wang Qiping and his collaborators carried out a study on the dual-nozzle airflow field and arc thermal boundary zone, and calculated the two-dimensional airflow field distribution in the arc extinguishing chamber of th...

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Problems solved by technology

[0005] To sum up, in the study of the air flow field, researchers from various countries focus on the arc model, the gas physical parameters in the zero-crossing stage, and t

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