Simulation calculation method for combined gap impulse discharge development process

Abstract

The invention relates to a simulation calculation method for a combined gap impulse discharge development process. The method comprises the following steps: step 1, establishing an electric field calculation physical model considering charged particle motion in the combined gap impulse discharge development process in finite element software; step 2, determining the potential of a potential suspension conductor in each discharge development stage by combining an electric field calculation result and a charged particle motion simulation result in a pre-discharge stage; and step 3, realizing simulation of a combined gap breakdown development process by taking a condition that the streamer with a relatively low development speed reaches the surface of the potential suspension conductor as a breakdown criterion. According to the method, the actual physical process of the combined gap discharge process can be analyzed, and the discharge mechanism of the combined gap discharge process can bedetermined.

Description

technical field [0001] The invention relates to a simulation calculation method for the development process of air gap discharge, in particular to a simulation calculation method for the development process of impulse discharge in combined gaps. Background technique [0002] Air is a widely used insulating medium. In order to select a suitable insulation distance, it is necessary to accurately understand the discharge voltage of the air gap. However, due to the incomplete gas discharge theory, it is difficult to carry out accurate simulation calculations on the discharge process of the gap. At present, the research on the typical gap is sufficient, and people have a clear understanding of its discharge characteristics. Although many of the gaps actually used are not typical electrodes, they can generally be estimated by referring to similar typical gaps. However, in the power system, there is also a special combination gap composed of multiple conductors, which is characte...

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Problems solved by technology

Compared with ordinary gaps composed of fixed potential conductors, this type of combined gap often has more complex discharge behavior due to the existence of potential suspension conductors, and it is difficult to simulate and analyze its discharge process and summarize its discharge characteristics

[0003] At present, when solving such problems in actual engineering, due to the unclear mechanism and lack of theoretical guidance, it mainly relies on true type tests to determine the characteristics of specific combined gap impulse discharges. These experimental studies are somewhat blind and tentative, and heavy workload

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