摘要
流注是长空气间隙放电的主要过程,其起始特性具有重要的理论价值与广泛的工程应用。以往对直流电压作用下流注起始特性的研究较多,对冲击电压特别是电压上升率较大的雷电冲击电压下流注起始特性研究很少。采用基于光电集成技术的高压侧电流测量系统与空间电场测量系统,对1 m棒–板间隙在正极性雷电冲击电压下流注起始特性进行研究,提出了新的流注起始观测手段,获得不同半径棒电极、不同电压上升率下的流注起始电压与场强,拟合得到考虑电压变化率的流注起始场强判据,并验证了所提出判据的广泛适用性。另外,还对正极性雷电冲击电压作用下流注起始时延的变化规律进行研究,定量测量了流注的起始时延,为研究流注起始时延的概率分布奠定基础。
Streamer performance is the main mechanism of long air gap discharge; the inception characteristic of streamer has been widely used in engineering. The streamer inception characteristic under DC voltage has been researched by many researchers, but the characteristic under impulse voltage especially under lightning impulse voltage with large voltage rise rate has been rarely studied. The current and electric field measurement system based on optic-electric integrated technology was proposed in this paper, focusing on the inception characteristics of streamers in 1 m rod-plane air gap energized by positive lightning impulse voltage. The new diagnosis of streamer inception was given, and the streamer inception voltages and electric fields under different electrode and voltage rise rate were recorded. According to experiment results, the streamer inception electric field criterion considering voltage rise rate was proposed. The criterion in this paper was verified for wide parameter ranges. The measurement results of streamer inception time delay were reported, which provides the basis for researching distribution and physical mechanism of streamer inception time delay.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2012年第19期148-153,198,共6页
Proceedings of the CSEE
基金
国家重点基础研究发展计划项目(973项目)(2011CB209403)
国家自然科学基金项目(50777035)~~
关键词
流注
电压上升率
起始场强
起始时延
streamer
voltage rising rate
inception electricfield
inception time delay
