雾凇覆冰过程的电晕放电动态特性研究

doi:10.11985/2020.02.017

摘要/Abstract

摘要：

导线带电、不带电条件下的覆冰特性存在差异,覆冰与电晕之间复杂的相互作用是造成此差异的重要原因。覆冰过程中的电晕动态特性是揭示这一相互作用的基础。在人工气候室内对导线进行带电覆冰,通过Q-V法测得了覆冰过程中导线电晕放电功率和工频周期放电量短时间内的统计特性和长时间的变化趋势。试验结果表明,覆冰引发的电晕放电具有随机性,工频周期放电量近似服从正态分布;随着覆冰增长,电晕放电功率和放电量的短时平均值及标准差均存在先增长后饱和或稍有减少的趋势;放电量、放电功率的增长时间与带电覆冰速率相关,导线承受场强超过10 kV/cm后,覆冰速度减慢,电晕放电功率与放电量的增长时间随场强增加而增加;导线表面电场强度增强时,放电量的标准差几乎保持不变,较强电场下覆冰电晕放电维持电压的增加可能是其原因。

关键词: 导线, 带电覆冰, 电晕放电, 动态特性, 统计特性

Abstract:

Considerable differences exist between conductor icing performance under energized or non-energized conditions, which in large part, lies in the complex interaction between icing and corona discharge. Time dynamic properties of corona discharge in energized icing process could reveal such interaction. Energized icing tests on conductor with several AC field strengths are carried out in the artificial climate chamber. With Q-V trace method, short time period statistical characteristic and long term variance trend of corona properties are obtained such as discharge power and discharge magnitude. Experimental results indicate that the distribution of discharge magnitude approximately belongs to normal distribution; with ice accretion, short time mean value and standard deviation of discharge power and magnitude saturate or slightly reduce after a initial raising period, the turning point of which is relevant to icing velocity influenced by field strength; the discharge maintain voltage increases with larger applied voltage, may resulting in the little increase of discharge magnitude standard deviation under larger applied voltage.

Key words: Conductor, energized icing, corona discharge, time dynamics, stochastic character

中图分类号:

TM85

田芝华, 张满, 陈静, 刘仁寰, 谢希, 席朝辉. 雾凇覆冰过程的电晕放电动态特性研究[J]. 电气工程学报, 2020, 15(2): 116-124.

TIAN Zhihua, ZHANG Man, CHEN Jing, LIU Renhuan, XIE Xi, XI Chaohui. Study the Dynamic Characteristics of Corona Discharge during the Rime Icing Process[J]. Journal of Electrical Engineering, 2020, 15(2): 116-124.

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导线表面场强/(kV/cm)	5	10	15	20
放电量增长时间/s	580	500	1 200	>1 800
放电功率增长时间/s	550	530	1 200	>1 800