Ultrasonic numerical simulation method for disruptive discharge of GIS (Gas Insulated Switchgear) under the condition of considering the influence of background fluid

Abstract

The invention relates to an ultrasonic numerical simulation method for disruptive discharge of a GIS (Gas Insulated Switchgear) under the condition of considering the influence of background fluid. The method comprises the following steps of: 1, establishing a corresponding numerical physical model according to an existing GIS physical model; 2, carrying out electric-magnetic-thermal-flow multi-physics field coupling simulation calculation, and obtaining a temperature distribution result, a pressure distribution result and a flow velocity distribution result of SF6 gas in the GIS in a steady state; 3, mapping temperature, pressure and flow velocity distribution results under the CFD calculation grid to a sound field grid through a weak-form partial differential equation; 4, according to the function that the density of the SF6 gas changes along with the temperature and the pressure during parameter setting, finally obtaining a linear Euler equation that the density, the pressure and the flow velocity of the SF6 gas change along with the space; and 5, obtaining a sound pressure instantaneous distribution result under the influence of the background fluid. Compared with the prior art, the method has the advantages that the precision of disruptive discharge ultrasonic simulation in the GIS is improved, and the like.

Description

technical field [0001] The invention relates to the field of GIS breakdown discharge ultrasonic numerical simulation, in particular to a GIS breakdown discharge ultrasonic numerical simulation method considering the influence of background fluid. Background technique [0002] Gas-insulated metal-enclosed switchgear (GIS) is an important equipment in power system. Because of its high safety and small footprint, it is widely used in the field of power transmission and transformation projects. However, GIS is a fully enclosed structure, and if there is a defect inside the equipment, it is not easy to check. Therefore, before the GIS equipment is put into operation, a withstand voltage breakdown test is generally carried out, and possible defects are eliminated by detecting the breakdown discharge signal. At present, it is a common way to locate the defect position by arranging piezoelectric ultrasonic sensors on the shell to detect the ultrasonic signals generated during the ...

AI Technical Summary

Problems solved by technology

This method assumes that the background fluid (such as transformer oil, SF6 insulating gas) is a static homogeneous medium, that is, it does not consider the influence of the flow and distribution of the background fluid on the propagation of sound waves, and ignores the resulting sound pressure. Signal attenuation, there is a certain deviation between the simulated results and the actual results

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