超高壓線路絕緣架空地線感應電壓及其影響因素研究
李奇超,伍弘,楊凱,房子祎
(國網(wǎng)寧夏電力有限公司電力科學研究院,寧夏 銀川 750011)
摘 要:針對超高壓輸電線路絕緣架空地線上可能產(chǎn)生過大的感應電壓問題,以330 kV線路為例,采用有限元分析軟件對不同運行及檢修工況下絕緣架空地線上產(chǎn)生的感應電壓進行仿真,并根據(jù)仿真結(jié)果設計了一種專用于絕緣架空地線的新型接地裝置。經(jīng)現(xiàn)場應用驗證表明,導、地線間距及導線排列方式、相序( 同塔雙回線路) 等是影響絕緣架空地線感應電壓大小的重要因素,且在線路不同工況下,絕緣架空地線上均可能產(chǎn)生較大感應電壓;所設計的接地裝置能在避免檢修人員電弧傷害的同時將絕緣架空地線可靠限制在地電位。
關鍵詞:高電壓技術;絕緣架空地線;有限元仿真;感應電壓;接地裝置
中圖分類號:TM755;TM862 文獻標識碼:A 文章編號:1007-3175(2020)08-0017-05
Research on the Induced Voltage and Its Influencing Factors of Insulated Overhead Ground Wire for EHV Transmission Line
LI Qi-chao, WU Hong, YANG Kai, FANG Zi-yi
(State Grid Ningxia Electric Power Company Electric Power Research Institute, Yinchuan 750011 , China)
Abstract: Aiming at the problem of excessive induced voltage on insulated overhead ground wires of UHV transmission lines, in this paper, it takes 330 kV line as an example, and uses finite element analysis software to simulate and analyze the induced voltage generated on insulated overhead ground wires under different operating and maintenance working conditions, and devised a new kind of grounding device dedicated to the insulated overhead ground wires according to the simulation results. The results show that the distance between the conductor line and ground wire, the arrangement of the lines and the phase sequence (common-tower double-circuit line) are important factors that affecting the magnitude of the induced voltage of insulated overhead ground wires. The devised grounding device can reliably limit the insulated overhead ground wire to ground potential while avoiding the arc injury of maintenance personnel.
Key words: high voltage technique; insulated overhead ground wire; finite element simulation; induced voltage; grounding device
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