Energy storage characteristics and discharge voltage prediction method of a gas medium

Abstract

The invention relates to a method for predicting energy storage characteristics and discharge voltage of a gas medium. The energy storage state of an insulating structure is characterized by using spatial scale characteristics, time scale characteristics and environmental factor characteristics. The spatial scale characteristics refer to the electric field distribution characteristics of the insulating structure. Time Scale features refer to the waveform feature quantity of the applied voltage, and environmental factor features refer to the pressure, temperature, humidity, etc. of the gas medium. A support vector machine is used to establish a discharge voltage prediction model, the energy storage characteristics are normalized as the input of the model, and whether the insulation structure breaks down under the loading voltage (1 or -1) is used as the output of the model, and a small number of typical electrodes ( Ball, rod, plate) insulation structure discharge voltage test data to train the model, and predict the discharge voltage of other insulation structures under different loading voltage waveforms. The invention has a simple prediction process and high accuracy, avoids complicated gas discharge process research, and helps guide the insulation optimization design of electrical equipment.

Description

technical field [0001] The invention relates to the field of gas discharge, in particular to an energy storage characteristic of a gas medium and a discharge voltage prediction method. Background technique [0002] Gas medium (such as air, sulfur hexafluoride, etc.) is a commonly used insulating medium for electrical equipment. At present, the insulation design of electrical equipment mainly relies on experimental verification, and lacks a complete insulation design theoretical system. Insulation problems must also be resolved by high voltage testing. The experimental research has the problems of high cost and long period, and the empirical formula obtained between the discharge voltage and the gap distance and other factors is often only applicable to a specific insulation structure. For complex insulation structures, it is difficult to use simple geometric parameters. Perform a complete characterization and repeat the test verification whenever the insulation structure i...

AI Technical Summary

Problems solved by technology

At present, the insulation design of electrical equipment mainly relies on experimental verification, and lacks a complete insulation design theoretical system. Insulation problems must also be resolved by high voltage tests

The experimental research has the problems of high cost and long period, and the empirical formula obtained between the discharge voltage and the gap distance and other factors is often only applicable to a specific insulation structure. For complex insulation structures, it is difficult to use simple geometric parameters. Perform a complete characterization and repeat the test verification whenever the insulation structure is changed

In addition, the breakdown mechanism of various dielectrics under different voltages is different, and the physical discharge process is extremely complex, with various influencing factors and strong randomness, making it difficult to form a unified and accurate mathematical model. Most of the research on discharge mechanism is based on various hypotheses (explanations of discharge phenomena). Due to the lack of engineering measurability and controllability of the research objects, the research conclusions are difficult to directly guide the insulation design of electrical equipment.

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