Arc plasma multi-physical-field finite element simulation analysis method for SF6 circuit breaker contact opening process

Abstract

The invention discloses an arc plasma multi-physical field finite element simulation analysis method in an SF6 circuit breaker contact opening process. The method comprises the following steps: firstly, constructing a two-dimensional axisymmetric structure model in an SF6 circuit breaker arc extinguishing chamber in COMSOL Multiphysics; performing finite element mesh generation and material attribute addition on the constructed structure; secondly, adding model physical field setting and boundary conditions, and configuring a transient solver; and finally, analyzing the evolution rules of thespeed, temperature, pressure, electromagnetic field and arc characteristics of the SF6 gas in the arc extinguishing chamber according to the calculation result. The theoretical calculation method forarc discharge in the working process of the SF6 circuit breaker contact under the medium-high voltage is established, the internal mechanism of arc change in the arc extinguishing chamber is simulatedand analyzed, and a basis is provided for theoretical analysis and experimental research of the SF6 circuit breaker.

Description

technical field [0001] The invention belongs to the technical field of simulation calculation, and relates to material parameters obtained based on experimental tests and multi-physics field finite element numerical simulation technology, specifically a SF 6 Arc plasma multiphysics finite element simulation analysis method for circuit breaker contact opening process. Background technique [0002] Sulfur hexafluoride circuit breakers use sulfur hexafluoride (SF 6 ) gas is used as a circuit breaker for arc extinguishing medium and insulating medium. It has been widely used in ultra-high voltage and large-capacity power systems. It is one of the special circuit breakers for the 40.5kV reactive compensation capacitor bank of the State Grid. With the general improvement of computer performance and the development of scientific research equipment, the SF 6 The physical characteristics of the circuit breaker arc extinguishing chamber are analyzed by numerical simulation, which ca...

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Problems solved by technology

However, the finite difference method is restricted in solving the geometric structure of the complex interrupter, and it is difficult to converge; both the simulated charge method and the surface charge method belong to the boundary segmentation method, which lacks effective calculations for the analysis of the physical characteristics of the field, and their own solutions are extremely demanding. High, with limitations in handling multiple dielectrics and thin electrodes; SF based on finite element method 6 Research on circuit breakers can quantitatively describe and comparatively analyze the distribution of physical quantities. For example, Zhang Chaoke and others used the finite element method to calculate 40.5kV SF 6 The electric field intensity distribution at different positions in the arc extinguishing chamber, Liu Xiaoming et al. used finite element numerical simulation to realize the SF 6 Analysis of the electric field intensity of the contact section of the arc extinguishing system with single and double fractures, Chen Yalin simulated and analyzed the 550kV SF through the finite element method 6 Electric field distribution with and without suspended electrodes in the terminal

However, such simulation studies are currently limited to SF 6 It is difficult to solve the coupling effect of multiple physical fields such as airflow field, magnetic field, temperature field, electric field, current field, and calorific value simultaneously in the numerical research of the electric field of the arc extinguishing chamber or a single physical field

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