500kV海底充油电缆护套绝缘在线监测方法  

Study on on-line jacket insulation monitoring for 500 kV submarine oil-filled cable

作　　者：魏新劳[1] 朱博[1] 庞兵[1] 陈庆国[1] 王颂[2] 李锐海[2] 

机构地区：[1]哈尔滨理工大学工程电介质及其应用教育部重点实验室,黑龙江哈尔滨150080 [2]中国南方电网科学研究院,广东广州510080

出　　处：《电机与控制学报》2015年第5期21-29,共9页Electric Machines and Control

基　　金：大型建筑结构中电力设备绝缘及其可靠性机理研究973项目(2012CB723308);黑龙江省研究生创新基金重点项目(YJSCX2012-078HLJ)

摘　　要：为了研究海南联网工程中所采用的海底充油电缆的绝缘状况,提出了基于双CT法的双端四电流传感器法对海底充油电缆护套绝缘进行在线监测,对该方法的原理进行了阐述,通过护套绝缘电流泄漏比和接地回路环流感应系数的变化作为判据来判断电缆护套的绝缘状况。给出了基于该方法的实施方案及监测系统,介绍了系统的组成,对电流传感器的结构进行了详细介绍。运用仿真软件构建电缆模型并对感应电流和电容电流进行仿真计算。现场实际监测结果与仿真计算结果表明监测系统能够真实的反应电缆护套绝缘状况。目前,监测系统已经在海南联网工程中运行,运行情况良好、数据稳定,为监测海底电缆护套绝缘状况提供了重要依据。Taking insulation condition of the submarine oil-filled cable which used in Hainan Interconnec-tion Project as the research object, a synchronous detection technique by using four current sensors to mo-nitor cable sheath insulation was put forward . The principle of the method was introduced and the ratio of jacket insulation leakage current and the inductance coefficient of grounding circuit current were proposed which can be used to judge the jacket insulation condition. The on-line monitoring system basic on the method was introduced, including the system composition and introduced the structure of current sensor in detail. Simulaiton software was used to build the cable model and simulation calculation on induced current and capacitive current were conducted. The simulation and monitoring results show that the monitoring sys-tem which can reflect condition of the cable insulation. The system was successfully put into operation in Hainan Interconnection project at present. The operation condition is good and test data is reliable, and provides an important basis on monitoring jacket insulation for submarine oil-filled cable.

关 键 词：海底充油电缆 绝缘在线监测 护套绝缘 接地电流 电流传感器 

分 类 号：TM855[电气工程—高电压与绝缘技术]