Mechanism of Critical Radius Phenomena for SF<sub>6</sub> Gap Under Impulse Voltages

ZHANG Lu; HUANG Guoqiang; ZHANG Qiaogen; ZHANG Mohan; SUN Lei; GUO Anxiang

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Mechanism of Critical Radius Phenomena for SF₆ Gap Under Impulse Voltages

更新时间：2025-12-08

- Mechanism of Critical Radius Phenomena for SF₆ Gap Under Impulse Voltages
- Vol. 44, Issue 3, Pages: 796-803(2018)
- 作者机构：
  
  1. 国网陕西省电力公司电力科学研究院
  2. 西安交通大学电力设备电气绝缘国家重点实验室
  3. 中国电建集团西北勘测设计研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：30 March 2018，
  
  Published：2018
- 稿件说明：
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ZHANG Lu, HUANG Guoqiang, ZHANG Qiaogen, et al. Mechanism of Critical Radius Phenomena for SF₆ Gap Under Impulse Voltages[J]. 2018, 44(3): 796-803.
DOI：

ZHANG Lu, HUANG Guoqiang, ZHANG Qiaogen, et al. Mechanism of Critical Radius Phenomena for SF₆ Gap Under Impulse Voltages[J]. 2018, 44(3): 796-803. DOI：

摘要

为探究冲击电压下SF

气体放电特性和机理

研制了陡前沿冲击试验装置。固定电极间距

研究了电极曲率半径对SF

间隙击穿特性的影响。结果表明:冲击电压下

间隙放电呈现出长空气间隙中所谓的"临界半径"效应

即随电极曲率半径减小

间隙50%击穿电压减小

曲率半径小于"临界半径"Rcr时

击穿电压基本不变;Rcr不仅随气压减小而增加

也随波头时间减小而增加;气压一定

负极性VFTO和雷电冲击下的临界半径值分别较正极性VFTO和雷电冲击下的大;正、负极性VFTO下临界半径分别较正、负极性雷电冲击下的大;负极性电压下

临界半径在物理上更接近于丝状流注区域

正极性电压下

临界半径更接近于均匀流注区域。"临界半径"现象与SF

气体中流注–先驱–先导放电发展过程相关

因此提出了先导击穿的临界电荷判据来对临界半径现象进行了解释。

Abstract

The steep-fronted impulse voltage test equipment was developed for studying the discharge characteristics and mechanisms of SF

gas under impulse voltages. The influences of electrode radius on breakdown characteristics of the distance fixed SF

gap were researched. It was found that the discharge behaviors of SF

gap presented the so-called critical radius effect occurred in long gap discharge in air. With the decrease of electrode radius

the 50% breakdown voltage of the gap decreased till the critical radius Rcr was reached

and then remained practically constant for further reduction of r. It was found that Rcr increased with the decrease of gas pressure and wave front time. When the pressure was fixed

the critical radius v

alue of negative VFTO or lightning impulse was bigger than that of positive VFTO or lightning impulse

the critical radius value of negative or positive VFTO was bigger than that of negative or positive lightning impulse. For negative voltage

Rcr is physically close to the length of filamentary streamer zone. While for positive voltage

Rcr is close to the length of homogeneous streamer zone. The critical radius phenomenon is related with the streamer-precursor-leader discharge process in SF

gas

which is explained by the proposed critical charge criterion of leader breakdown.

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GUO Anxiang

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ZHANG Qiushi

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Related Institution

Qinhuangdao Power Supply Company, State Grid Jibei Electric Power Co., Ltd.

Xi’an Jiaotong University

Electric Power Research Institute, State Grid Shaanxi Electric Power Company

China Electrical Power Research Institute

School of Electrical Engineering, Wuhan University

AI问答

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Mechanism of Critical Radius Phenomena for SF6 Gap Under Impulse Voltages

DOI：

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Mechanism of Critical Radius Phenomena for SF₆ Gap Under Impulse Voltages