文档介绍：
高压直流导线的电晕起始条件#
何金良,郑跃胜,张波*
(清华大学电机系,北京 100084)
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摘要:随着直流输电线路电压等级的不断提高,电晕放电已经成为高压直流输电的关键技术
问题之一。在传统的电晕起始判据中,判据表达式和面积因子表达式都存在很大的差异甚
至矛盾。本文对电晕起始判据表达式进行详细的推导和分析,利用改进的电晕起始判据,
研究高压直流导线在不同导线半径和相对空气密度下的电晕起始条件。结果表明:正电晕
和负电晕的表面起晕场强都满足 E0/δ 0 = f (r0δ 0)的关系,基于电晕的二次电子发射机
制,从机理上解释了经典的 Peek 公式。
关键词:高电压工程;电晕放电;光电离;面积因子
中图分类号:TM851
Onset Criterion for High-voltage Direct-current Conductors
HE Jinliang, ZHENG Yuesheng, ZHANG Bo
(Department of Electrical Engineering, Tsinghua University, Beijing 100084)
Abstract: With the rapid development of the high-voltage direct-current (HVDC) transmission
lines, corona discharge es one of the most important problems of the HVDC transmission
projects. In the traditional corona onset criterion, the criterion equation and geometric factor are
different or even contradictory according to different researchers. In this paper, the corona onset
criterion is detaily analyzed. Using the improved corona onset criterion, corona discharge on the
HVDC conductors with different radius in different air conditions are studied. The results show
that the onset electric field of positive and negative corona both satisfy the relationship of E0/δ0 =
f (r0δ0). Based on the mechanism of secondary electron avalanche, the mechanism of the classic
Peek fomula is explained.
Key words: high voltage engineering; corona discharge; phot