Method and system for calculating arc plasma components under chemical non-equilibrium effect

Abstract

The invention discloses a method and a system for calculating arc plasma components under a chemical non-equilibrium effect. The method comprises the following steps: 1) carrying out structure optimization on gas molecules; 2) calculating a molecular path; 3) for arc plasma in a local thermodynamic equilibrium state, calculating entropy, enthalpy and specific heat of particles involved in a path by utilizing a density functional theory; 4) solving a local thermodynamic equilibrium state arc plasma component by utilizing a Gibbs free energy minimization method or a mass action law; 5) for the chemical non-equilibrium arc plasma, calculating the chemical reaction rate in the path by using a variational transition state theory; 6) solving the components of the chemical non-equilibrium arc plasma by using the kinetic model. The invention provides a method for calculating arc plasma components under a chemical non-equilibrium effect, which is used for calculating the plasma components of two possible states of gas arc plasma and providing a data basis for magnetofluid simulation of an arc.

Description

technical field [0001] The invention belongs to the technical field of electrical insulating media, and relates to a method and system for calculating arc plasma components under chemical non-equilibrium effects. Background technique [0002] Hexafluoride (SF 6 )'s excellent dielectric strength and arc extinguishing performance are used as arc extinguishing medium in high voltage power equipment. SF 6 Environmental problems are becoming more and more serious, and it has been listed as one of the six emission-restricted greenhouse gases by the Kyoto Protocol. Therefore, looking for SF 6 Alternative gas is an urgent problem to be solved at present. In power switchgear, when a system short-circuit fault occurs, there are two methods for evaluating the characteristics of the arc in the high-voltage circuit breaker: experimental measurement and simulation calculation. In terms of experiments, macroscopic physical quantities such as arc voltage and arc current are measured an...

AI Technical Summary

Problems solved by technology

Due to the existence of the non-chemical equilibrium state, the original statistical physics method cannot accurately describe the particle distribution and internal process of the plasma, but it is necessary to establish a governing equation for each particle that includes both the chemical reaction process and the physical process, so that the established The modulus and calculation difficulty are greatly increased

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