电网技术2017，Vol.41Issue(11)：3420-3426,7.DOI:10.13335/j.1000-3673.pst.2017.0997
邻近线路对±1100kV直流线路雷电屏蔽效果影响计算研究
Calculation Research on Influence of Adjacent Lines on Lightning Shielding Failure of ±1100 kV DC Transmission Line
摘要
Abstract
Due to shortage of land resources in China, there may be two or more transmission lines in sections of a transmission channel of±1100 kV UHV DC project. Operation experience shows that due to polarity effect, lightning shielding characteristics of DC transmission lines have certain regularity comparing with AC transmission line. In order to study influence of adjacent lines on lightning shielding characteristics of±1100 kV DC lines, this paper explores influence of different arrangement of polarity, height of adjacent lines and separation distance, et al to achieve the most cost-effective lightning protection scheme. In this paper, based on electrical geometric model, a lightning shielding simulation model with a ±1100kV line and other lines in parallel was built to calculate conductor striking frequency. Lighting shielding factor was introduced to quantitatively analyze effect of adjacent lines on ±1100 kV line shielding. It was found that there existed remarkable influence of polarity, tower structure (single- or double-circuit transmission lines), tower height and separation distance on lightning shielding characteristics. In construction of±1100kV DC project, it is recommended that the positive polarity conductor should be arranged near the adjacent line side, thus reducing lightning shielding failure rate of± 1100kV line. When the distance to adjacent lines is close, the lightning shielding failure rate of±1100kV line is greatly reduced, and it can be considered to simplify measures against shielding failure to cut costs.关键词
±1100kV/特高压直流/电气几何模型/绕击/雷电屏蔽因子Key words
±1100 kV/ultra-high voltage DC transmission line/electric geometry model/shielding failure/lightning shielding factor分类
信息技术与安全科学引用本文复制引用
文习山,邓冶强,王磊,何慧雯,王羽,孙泽中..邻近线路对±1100kV直流线路雷电屏蔽效果影响计算研究[J].电网技术,2017,41(11):3420-3426,7.基金项目
国家重点研发计划项目(2016YFB0900801)(±1100 kV直流工程过电压抑制与绝缘配合及雷电防护技术研究). Project Supported by the National Key Research and Development Program of China(2016YFB0900801). （2016YFB0900801）
