Research on injection charge characteristics of long streamer under positive lightning impulse voltage

Yinan Geng

doi:10.1063/1.5132297

Abstract

Streamer is the main process of air gap discharge, and the injection charge characteristics of a long streamer under positive impulse voltage are of great significance for revealing the discharge mechanism of long air gap, selecting reasonable air gap distance, optimizing insulation configuration, and solving the key problems faced by current transmission engineering. Taking the 1 m rod–plate gap as the research object, the long streamer with a length of 20–35 cm was obtained at the rod electrode head by applying positive lightning impulse voltage, and the total injection space charge with a different radius and length was obtained by measuring the streamer discharge current at the high voltage end and integrating it. The empirical formulas between the total injection charge and the initial voltage and the length of the streamer are deduced theoretically and verified by experimental data. The total injection charge has a linear relationship with the square of the initial voltage and the square of the streamer length. The key physical parameters such as the initial physical process of the streamer under impulse voltage, the minimum initial field strength of the streamer, and the internal electric field in the streamer region are also discussed. Research and discussions [Ebert and Sentman, J. Phys. D: Appl. Phys. 41, 230301 (2008)] were carried out.

Highlights

INTRODUCTIONThe spatial scale of the streamer has a large span, and it can be applied in different scales. As a low temperature plasma, the streamer is mainly used in ozone generation, gas and water purification, surface modification of (biological) materials, and ignition triggering of internal combustion engines. These studies mainly focus on the short streamer with mm–cm length, and numerical simulation is the main method. For the insulation problem in the power system, the length of the streamer can reach tens of centimeters to several meters
The spatial scale of the streamer has a large span, and it can be applied in different scales.1 As a low temperature plasma, the streamer is mainly used in ozone generation, gas and water purification, surface modification of materials, and ignition triggering of internal combustion engines.2–6 These studies mainly focus on the short streamer with mm–cm length, and numerical simulation is the main method.7–10 For the insulation problem in the power system, the length of the streamer can reach tens of centimeters to several meters
Long streamer is the key process of long air gap discharge under positive impulse voltage, and the total injection charge is the key physical parameter

Summary

INTRODUCTION

The spatial scale of the streamer has a large span, and it can be applied in different scales. As a low temperature plasma, the streamer is mainly used in ozone generation, gas and water purification, surface modification of (biological) materials, and ignition triggering of internal combustion engines. These studies mainly focus on the short streamer with mm–cm length, and numerical simulation is the main method. For the insulation problem in the power system, the length of the streamer can reach tens of centimeters to several meters. As a low temperature plasma, the streamer is mainly used in ozone generation, gas and water purification, surface modification of (biological) materials, and ignition triggering of internal combustion engines.2–6 These studies mainly focus on the short streamer with mm–cm length, and numerical simulation is the main method.. For the experimental study of the streamer, the diameter of the streamer, development speed, space electric field, discharge current, and injection current are the focus of attention. Cooray’s research group has established a static model of space charge distribution, which is used to study the change in the whole streamer region. The injection space charge of different length streamers was obtained by measuring the discharge current of the streamer at the high voltage end under different radius conditions. The empirical formula between the injection charge and the initial voltage is deduced theoretically, and the physical process and mechanism of the development of a long streamer are studied

EXPERIMENTAL SETUP

TYPICAL MEASURED RESULTS OF STREAMER CURRENT UNDER LIGHTNING IMPULSE VOLTAGE

The streamer injection charge Q i

CONCLUSION