电工技术学报  2018, Vol. 33 Issue (3): 601-608    DOI: 10.19595/j.cnki.1000-6753.tces.161704
高电压与绝缘 |
直流叠加交流电压下交联聚乙烯中电树枝特性研究
刘云鹏1,2, 刘贺晨1, 李演达1, 郁利超1, 芮皓然1
1.华北电力大学河北省输变电设备安全防御重点实验室保定 071003
2.新能源电力系统国家重点实验室(华北电力大学)北京 102206
Research of the Electrical Tree Properties in XLPE under DC-AC Composite Voltages
Liu Yunpeng1,2, Liu Hechen1, Li Yanda1, Yu Lichao1, Rui Haoran1
1. Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense North China Electric Power University Baoding 071003 China
2.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China
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摘要 电树枝在直流电压和交流电压下具有明显不同的引发和生长特性。为了研究直流电缆系统中直流成分和交流成分对电树枝特性的影响,该文研究了直流叠加交流电压情况下电树枝的引发和生长特性。研究结果表明,交流分量的引入极大地降低了电树枝的引发电压,并使得电树枝的生长速度较单纯直流电压下大大增加。直流叠加交流复合电压下电树枝的引发主要受交流分量的影响,而直流电压对其影响较小。负极性直流偏置电压下,电树枝主要为双结构的松枝状树枝,生长速度较慢,且直流电压的增大并未对其生长速度造成明显影响;而正极性偏置电压下,电树枝分支较少,生长速度较快,生长速度随着电压的增大而迅速增加。实验结果表明直流电缆系统中若存在较大的交流分量,将对直流电缆系统的绝缘安全构成较大威胁。
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刘云鹏
刘贺晨
李演达
郁利超
芮皓然
Abstract:The initial and growth properties of electrical trees under DC and AC voltages are quite different. In order to investigate the influences of DC and AC components in HVDC cable system on the electrical tree properties, the initial and growth properties of electrical trees under DC and AC composite voltages were studied in this paper. The results showed that the introduction of AC component greatly reduced the DC tree inception voltages and the growth rate increased significantly compared to that under pure DC voltage. The initial properties of the electrical tree were mainly affected by the AC component, and the DC voltage had little influence on the initial properties. The electrical trees were mainly pine-branch type with a relatively slow growth rate under negative DC bias voltages. Besides, the increase of the negative voltage had little influence on the growth rate of the electrical tree. In contrast, the electrical trees were mainly branch type with a relatively faster growth rate under positive DC bias voltages and the growth rate of the electrical tree increased rapidly with the increase of the voltage. The test results indicated that the insulation safety will be threatened if there is a larger AC component in the HVDC cable system.
Key wordsDC-AC composite voltages    electrical tree    XLPE    DC cable    polarity effect   
收稿日期: 2016-10-26      出版日期: 2018-02-26
PACS: TM215  
  TM247  
基金资助:国家重点研发计划(2016YFB0900705)和中央高校基本科研业务费专项资金(2016SX92)资助
通讯作者: 刘贺晨 男,1989年生,博士,讲师,研究方向为高压电力电缆局部放电检测与定位、高压直流电缆输电、直流电缆绝缘检测及老化特性等。E-mail:hc.liu@ncepu.edu.cn   
作者简介: 刘云鹏 男,1976年生,博士,教授,博士生导师,研究方向为特高压输电技术、电气设备在线检测和外绝缘。E-mail:liuyunpeng@ncepu.edu.cn
引用本文:   
刘云鹏, 刘贺晨, 李演达, 郁利超, 芮皓然. 直流叠加交流电压下交联聚乙烯中电树枝特性研究[J]. 电工技术学报, 2018, 33(3): 601-608. Liu Yunpeng, Liu Hechen, Li Yanda, Yu Lichao, Rui Haoran. Research of the Electrical Tree Properties in XLPE under DC-AC Composite Voltages. Transactions of China Electrotechnical Society, 2018, 33(3): 601-608.
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