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

A technology of breakdown discharge and numerical simulation, which is applied in CAD numerical modeling, electrical digital data processing, instruments, etc., can solve the problems of ignoring the sound pressure signal attenuation, not considering the influence of background fluid sound wave propagation, etc., and achieve the effect of improving accuracy

Active Publication Date: 2022-01-21
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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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

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

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Embodiment Construction

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0038] Such as figure 1 As shown, the method for numerical simulation of GIS breakdown discharge ultrasonic waves under the influence of the background fluid in the embodiment of the present invention includes the following steps:

[0039] S101: Establish the corresponding numerical physical model based on the existing GIS physical model. This implementation case takes the 252kV three-phase common box GIS busbar as the prototype, and its two-dimensional cr...

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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 ...

Claims

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Application Information

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IPC IPC(8): G06F30/28G06F111/10G06F113/08G06F119/08G06F119/14
CPCG06F30/28G06F2111/10G06F2113/08G06F2119/08G06F2119/14Y02E60/00
Inventor 司文荣朱炯姚维强关宏傅晨钊胡海敏倪鹤立胡正勇杨剑
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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