Air gap breakdown voltage prediction method

Abstract

The invention relates to an air gap breakdown voltage prediction method. The method is characterized by selecting several typical electrode structure air gaps and determining a factor and a level range which influence a breakdown voltage; selecting an orthogonal table which can be used to inspect each level of the above factor and successively carrying out breakdown voltage tests according to a test condition corresponding to each test number; loading a breakdown voltage test value so as to carry out electrostatic field calculation on the typical electrode structure air gaps and extracting an electric field distribution parameter from a calculation result; using a support vector machine to establish a breakdown voltage prediction model, taking the electric field distribution parameter as an input of a model, taking whether the gap is in a breakdown state under a loading voltage as an output of the model, using typical electrode structure air gap breakdown voltage test data to train a support vector machine model so that an air gap breakdown voltage of another electrode structure is predicted and obtained. By using the method in the invention, a prediction process is simple; accuracy is high; a test quantity needed by air gap discharge characteristic research can be decreased and test cost is reduced.

Description

technical field [0001] The invention relates to the field of electrical external insulation, in particular to an air gap breakdown voltage prediction method. Background technique [0002] The discharge characteristics of the air gap is a key concern of high-voltage AC and DC power transmission and transformation projects. At present, the external insulation design of power transmission and transformation projects mainly relies on the discharge characteristic test for verification. The single relationship between the breakdown voltage and the gap distance obtained is limited to a specific gap structure. For complex gap structures, it is difficult to pass the electrode size, gap Simple geometric parameters such as distance are used to fully characterize it. Once the gap structure changes, repeated tests are required. However, the discharge characteristic test of the air gap often has the problems of long cycle and high cost. Therefore, it is necessary to use numerical simulat...

AI Technical Summary

Problems solved by technology

However, due to the inherent complexity of the physical process of air-gap discharge, the limitations of testing methods, and the uncertainty of numerical solution algorithms, there are still many unresolved problems in the current research, resulting in the prediction results of the physical model and the experimental measurement results. There is a certain deviation

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