摘要
中国输电线路覆冰极为严重,覆冰会使导线表面的起晕电压降低,从而增加电晕放电的发生概率,对国民经济和生活产生较大影响。虽然国内外学者针对导线覆冰进行了大量研究,但绝大多数是在人工气候室内进行模拟覆冰,所得结论与工程实际存在较大差异。笔者利用湖南省雪峰山自然覆冰试验站,完成了LGJ-(70/40,185/25,240/30,400/35)4种不同直径绞线雨凇覆冰后的起晕电压测量试验。试验结果表明:利用紫外光子技术可以高效准确地测量覆冰导线的起晕电压值;覆冰时间的增加会使导线的起晕电压继续下跌,但速度逐渐变慢;相同覆冰时间内的不同绞线,直径越粗则起晕电压越高;覆冰水电导率的增加会促使起晕电压继续降低。结论可为研究自然覆冰对输电线路电晕特性的影响提供理论基础。
The transmission line in China was iced very seriously in winter by the natural glaze. The corona incep- tion voltage （CIV） of conductors will be reduced after glaze icing, thereby the increased probability of the corona discharge has a great impact on the national economy and life. Although the domestic and foreign scholars have made many researches on icing, most of them are to simulate the ice in the artificial climate chamber, so there are some difference between the conclusions and engineering applications. Therefore a series tests of AC corona incep- tion voltage for LGJ-（70/40, 185/25, 240/30,400/35） which are the stranded wire to be done after icing the glaze in the Hunan Xuefeng mountain natural icing station. The results show that the ultraviolet photon technology can be used to measure the CIV efficiently and accurately. The icing time increases the CIV decreases continually while the speed saturate. Conductor with thicker diameter will get higher onset voltage than thinners in the same icing time. Higher conductivity decreases the CIV gradually. The conclusion of this paper can provide a theoretical reference for the influence of the natural icing on the corona characteristics of the transmission line.
出处
《高压电器》
CAS
CSCD
北大核心
2016年第10期56-60,共5页
High Voltage Apparatus
基金
国家重点基础研究发展计划(973计划2009CB724502
2009CB724501)
国家重点实验室项目(2007DA10512708101
2007DA10512708102)~~
关键词
绞线
自然覆冰
起晕电压
电导率
紫外光子
stranded conductor
natural icing
corona onset voltage
conductivity
ultraviolet photon
