110 kV海纜終端外絕緣故障分析及預防措施研究
周路遙，王少華，劉浩軍，曹俊平，楊勇
（國網浙江省電力公司電力科學研究院，浙江 杭州 310014）
摘 要：針對110 kV海纜A1線、A2線中發生的瓷套式戶外終端外絕緣故障，進行故障終端檢測及事故原因分析，現場檢測發現海纜故障相終端均存在外部放電痕跡，并伴有燒灼痕跡及金屬熔化物。故障原因與區域特殊氣候條件有較大關系，分析認為終端套管覆冰引起表面電場不均勻度加劇，在融冰過程中套管表面的鹽污會增加泄漏電流，最終沿冰層表面發生閃絡。通過電場仿真驗證了覆冰、污穢以及加裝硅橡膠增爬傘裙對終端外部電場的影響，結果表明加裝增爬傘裙可以增加爬電距離，對防止冰閃有效果。為預防此類故障發生，可對終端套管進行防鹽蝕處理、噴涂防污閃材料、加裝增爬傘裙，并提升海纜在線監測和狀態檢測水平。
關鍵詞：海纜終端；外絕緣；覆冰閃絡；增爬傘裙
中圖分類號：TM726.3 文獻標識碼：B 文章編號：1007-3175(2018)05-0042-04
Study on Diagnosis and Preventive Measures of 110 kV Submarine Cable Terminal External Insulation Fault
ZHOU Lu-yao, WANG Shao-hua, LIU Hao-jun, CAO Jun-ping, YANG Yong
（State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014, China）
Abstract: Fault terminal diagnosis and the cause of the accident were analyzed for the external insulation fault of porcelain sleeve outdoor terminal in line A1 and line A2 of 11 0 kV submarine cable. Site detection showed that the fault phase terminal has external discharge traces, accompanied by burning traces and metal melting. The cause of the fault was related to the regional special climatic conditions. It is concluded that the bushing surface icing increased the unevenness of the surface electric field, and the salt current on the bushing surface would increase the leakage current during the melting process. Finally the flashover happened along the icing surface. The electric field simulation verified the effect of ice coating, contamination and the addition of silicone rubber creepage extender on the external electric field of the terminal. The results show that the installation of the creepage extender can increase the creepage distance and prevent the icing flashover. In order to prevent such failures, the terminal bushing can be treated with anti-corrosion treatment, spray anti-pollution flashover material, install the creepage extender, so as to improve the level of online monitoring and condition detection in submarine cable.
Key words: submarine cable terminal; external insulation; icing flashover; creepage extender
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