摘要
SF6气体绝缘变压器(GIT)在城市电网中得到广泛应用,建立GIT局部放电在线监测系统,对准确掌握设备内部绝缘运行状态和指导检修具有重要意义。为此根据现场GIT的结构和运行特点,设计了适用于现场局部放电检测的外置超高频微带贴片天线(MPA)传感器。采用选择天线基板材料、附加阻抗匹配和多调谐回路等频带展宽技术,设计的天线有效工作频带为340～440MHz(驻波比<2),相对带宽25.6%,最大增益达到5.38dB。MPA传感器安装在电缆进线侧、风机管道处、110kV侧及10kV侧散热管处的GIT绝缘子上,构建了GIT局部放电在线监测系统,开发了基于#C的监测系统软件。通过重庆市新民街GIT变电站运行,运行结果表明,研制的在线检测系统能实现GIT现场的局部放电信号的长期在线监测,为GIT的状态检修提供了大量的可靠数据。
According to the structure and operating characteristic of gas insulated transformer （GIT）,an outer ultra high frequency （UHF） microstrip patch antenna （MPA） sensor was designed suitable for detecting the partial discharge on site. Some effective methods for expanding bandwidth are utilized in the design process,such as choosing the material,adding impedance matching and multi-tuning loop. The effective working bandwidth of the antenna is 340～440 MHz,and the relative bandwidth is 25.6%,at the same time ,the maximal gain reaches 5.38 dBi. MPA sensors were installed on the GIT insulators,which were located in the cable section of incoming line,fan duct,cooling pipe of 110 kV and 10 kV side. Then online monitoring system for GIT was structured and detecting system software based on #C was developed. Through the operation of GIT substation in Xinmin street of Chongqing City,the results show that the online monitoring system developed can detect UHF GIT PD signal for a long time,which have provided lots of reliable data for condition-based maintenance.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2010年第7期1692-1697,共6页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2009CB724506)
国家自然科学基金(50977095)~~
关键词
SF6
气体绝缘变压器
微带贴片天线
局部放电
超高频
在线检测
SF6
gas insulated transformer （GIT）
microstrip patch antenna （MPA）
partial discharge （PD）
ultra high frequency（UHF）
on-line monitoring
