南方电网技术2018，Vol.12Issue(1)：1-6,6.DOI:10.13648/j.cnki.issn1674-0629.2018.01.001
中国首根±525 kV XLPE绝缘直流电缆的设计与试验验证
Design and Test Verification of China's First ± 525 kV XLPE Insulated DC Cable
摘要
Abstract
The development and test of China's first ± 525 kV cross-linked polyethylene(XLPE) DC cable are introduced. A type of heteromorphic copper conductor with a section of 3 000 mm2was designed, and a water-blocking tape was chosen as filler material. After calculation,the filling factor of the conductor reached 95.5%. Longitudinally permeability tests on the insulated conductor have proceeded under the condition of 2 MPa hydraulic pressure for 10 d and 1 m water column with thermal cycling for 10 times,the length of permeability was 7.2 m and 0.9 m respectively. Copper wires were twisted as a metallic shield of the ± 525 kV XLPE DC cable, among the copper wires,two optical fibers were implanted in to achieve the requirements of communication and thermometry online. A composite waterproof sheath was compounded with aluminum-plastic tape and PE,hence,the outer diameter of cable has been min-ished 10% compared to corrugated aluminum-sheathed cable in the same voltage and section. To verify its electrical properties,volt-age test and partial discharge test under AC 525 kV were carried out,then a whole performance type test was taken in National Center of Testing and inspection for Electric Cable and Wire(TICW) referred to CIGRE TB496—2012 and GB/T 31489.1—2015,including load cycle test,DC withstand voltage test, superimposed impulse test and so on, and the conductor passed all the tests. During the load cycle test,the maximum temperature of the conductor was over 70℃,and the temperature gradient in insulation exceeded 30℃.关键词
交联聚乙烯绝缘/±525kV直流电缆/3000mm2型线阻水铜导体/铜丝屏蔽/铝塑复合带/全性能型式试验Key words
XLPE insulated/± 525 kV DC cable/3 000 mm2longitudinally water-blocking heteromorphic copper conductor/copper wire metallic shield/aluminum-plastic tape/whole performance type test分类
信息技术与安全科学引用本文复制引用
张洪亮,张建民,于洪淼,闫志雨,谢书鸿,薛建林..中国首根±525 kV XLPE绝缘直流电缆的设计与试验验证[J].南方电网技术,2018,12(1):1-6,6.基金项目
国家重点研发计划(2016YFB0900703).Supported by the national Key Research and Develop-ment Plan(2016YFB0900703). （2016YFB0900703）
