Study on Initiation Characteristics of Low-Pressure Positive-Polarity 1 m Air Gap Impinging Stream Discharge

doi:10.3969/j.issn.1008-0198.2023.01.012

Abstract

Abstract: Flow discharge is the first complete discharge stage in positive long air gap discharge. It is important to understand the mechanism of air gap breakdown and lightning flash process at high altitude to obtain the characteristics of low pressure flow discharge. Based on the critical volume model of flow discharge under impulse voltage, and considering the effect of gas pressure on the rate of negative ion desorption in critical volume, the initial discharge model is established, which considers many factors such as gas pressure, curvature radius of electrode and rise rate of voltage, etc. . A flow discharge experimental observation system based on a low pressure 1m air gap discharge chamber is designed and constructed, the distribution characteristics of the initial delay of flow discharge at 0.06 MPa, 0.08 MPa and 0.1 MPa are obtained, and the accuracy of the model is further verified. By using this model, it can be found that, under the constant condition of reduced electric field E/N, the effects of gas pressure, electrode size and voltage rise rate on the initial mean electric field and the dispersion of initial time delay of the discharge are calculated and analyzed. The research can provide guidance and reference for insulation coordination and lightning shielding performance evaluation of high altitude transmission and transformation engineering equipment.

Key words: long air gap discharge, low pressure, streamer initiation, critical volume model, discharge delay

CLC Number:

TM855

HU Jinyang, XU Xiaoyun, CHE Junru, ZHANG Wanxia, CHENG Chen, HE Hengxin. Study on Initiation Characteristics of Low-Pressure Positive-Polarity 1 m Air Gap Impinging Stream Discharge[J]. Hunan Electric Power, 2023, 43(1): 70-78.

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