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A FEM platform is developed to support high precision electric field computing and data analysis. For the precise computing of 550kV SF6 arc quenching chamber, a solve regions division project is presented to improve meshes quality and computation efficiency. At the same time, approach regular triangle algorithm is realized by combing the uniform and gradient disperse for boundary, constraint condition...
Based on the N-S and Maxwell equation, a mathematical model describing the arc behavior in SF6 circuit breaker (CB) has been deduced. The effect of Lorentz force, turbulent and physical parameters on the characteristic of arc plasma was considered in the model. Using the finite volume method, the distributions of controlling parameters for arc in SF6 circuit breaker, such as viscosity, electric conductivity,...
In order to explain the mechanism of high voltage interrupter, a particle in cell method is used in our work to simulate the breakdown process before arc formation of vacuum and SF6 circuit breaker. The electrons and ions which play vital roles in this process are traced by Newton equation. The electrons from field emission, impact ionization and secondary electron emission are all considered in our...
In this paper, the novel Rotary-Gas nozzle structure with the advantage of arc extinguishing capacity has been investigated. The 126kV SF6 circuit breaker is taken as the investigation model and the novel structure with Rotary-Gas Grooves in the upstream nozzle is presented. Using Finite Element Method, it focuses the influence of Rotary-Gas groove on electric field in the arc-quenching chamber. To...
Coupling of multi physical parameters in extra high voltage SF6 circuit breaker (EHV SF6 CB) has been investigated. A 2D combined mathematical model of electric field, flow field and k - ?? turbulent flow was developed, and the coupling condition of multi physical field of CB was established. And the computation has been carried out for a 500 kV 1-break SF6 CB. The multi physical parameters and the...
Based on the numerical computation of 2D compressible, viscous and turbulent gas flow physical-mathematical model for a extra high voltage SF6 circuit breaker (EHV SF6 CB), the aerodynamic behavior and pressure characteristics under no load interrupting have been obtained using the improved combination method of FVM and TVD scheme. And the pressure time series of different points, the phase space...
Blowing gas method directly affects the interrupting capability in arc-quenching chamber of puffer SF6 circuit breaker. Aiming at the proposed novel Rotary-Gas nozzle structure of the arc-quenching chamber, finite volume method has been applied to analyze the 3D flow field. Computational fluid dynamic (CFD) simulation for the interrupting process has been performed. The simulation provides the comparison...
Sulfur hexafluoride is a gas with high electronegativity. For its strong adsorption to the electrons, it is widely used in the gas insulation. A microscopic model is established in our work to study the motions of particles in sulfur hexafluoride gas. Particle in cell method is used to trace the motions of the charged particles and the collisions between electrons, ions and atoms are simulated by...
Optimization of interruption performance in high voltage circuit breaker is mainly the optimization of dielectric recovery, among which the nozzle optimization occupies an important position. Because the optimization of dielectric recovery involves numerical calculation of electric field and flow field, time consuming becomes the bottleneck of nozzle optimization. Therefore, a new calculation method...
A 3D electric field mathematical model of the arc-quenching chamber in an 800 kV 2-break extra high voltage SF6 circuit breaker (EHV SF6 CB) has been established and the finite element method (FEM) has been applied to calculate the electric field in the arc-quenching chamber. In computing, multi-dielectrics (such as: air, porcelain casing, PTFE nozzle, SF6 gas) have been taken into consideration....
To study the insulation performance and the dielectric recovery characteristics based on the interaction of electric field and gas flow field in high voltage circuit breakers (HV CBs), a two-dimensional coupling physical-mathematical model has been developed. And the influence of shock wave and turbulent flow has been taken into consideration. To realize the dynamic simulation of the coupling field...
Nozzle plays very important role to control the gas flow during the interruption for SF6 circuit breaker (CB). Due to the higher non-linear global mapping relationship between interruption performance of SF6 CB and its nozzle structural parameters, artificial neural network (ANN) and genetic algorithm (GA) were applied to the nozzle parameter optimization of SF6 CB on the basis of the non-linear mapping...
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