特高压GIL故障定位超声衰减特性及试验研究  

Ultrasonic Attenuation Characteristics and Its Experimental Research for UHV GIL Fault Location

作　　者：刘云鹏[1] 费烨[1,2] 陈江波 程林 李梦齐[3] 刘诣[3] 邵苠峰[2] LIU Yunpeng;FEI Ye;CHEN Jiangbo;CHENG Lin;LI Mengqi;LIU Yi;SHAO Minfeng(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,Hebei Province,China;China Electric Power Research Institute,Wuhan 430074,Hubei Province,China;Wuhan NARI Limited Company of State Grid Electric Power Research Institute,Wuhan 430074,Hubei Province,China)

机构地区：[1]华北电力大学电气与电子工程学院,河北省保定市071003 [2]中国电力科学研究院有限公司,湖北省武汉市430074 [3]国网电力科学研究院武汉南瑞有限责任公司,湖北省武汉市430074

出　　处：《电网技术》2020年第8期3186-3192,共7页Power System Technology

基　　金：国家重点研发计划项目(2017YFB0902500);国家电网有限公司科技项目(GYW11201801543,GYW11201605592)。

摘　　要：苏通气体绝缘金属封闭输电线路(gas-insulated transmissionline,GIL)综合管廊工程单相GIL长度接近5.8 km,在运行过程中一旦发生内部击穿将会对电网安全运行造成极大隐患,超声波原理故障定位方法可以快速和准确查找故障位置以便开展检修更换,难点在于超声波在特高压GIL上传输衰减特性及传感器的布置方法,其决定了故障定位的精度。为达到苏通工程故障定位到GIL气室的要求,研究了超声波在特高压GIL中衰减特性,开展了特高压GIL故障模拟试验和真型故障定位试验,获得了超声波经过特高压GIL直线单元、气隔盆子和伸缩节的衰减规律,得到了苏通工程GIL单个气室直线单元传感器布置方法,并对后续研究工作提供了一定建议。研究结果表明,超声波经GIL直线单元36 m传播后衰减约60%,经气隔盆子和伸缩节衰减约70%和89%,苏通工程单个气室布置2~3个超声波传感器即可达到故障定位到气室的精度要求。The single-phase GIL length of Sutong GIL project is close to 5.8 km. Once an internal breakdown occurs during operation, it will be dangerous to the power grid operation. The ultrasonic principle fault location method can quickly and accurately find the fault location for maintenance. Its difficulty is the attenuation characteristics of ultrasonic transmission on UHV GIL and the arrangement of the sensors, which determine the accuracy of the fault location. In order to meet the requirements that Sutong project fault location should be exact to GIL air chamber, this paper studies the attenuation characteristics of ultrasonic waves in UHV GIL, conducts UHV GIL fault simulation and fault location tests, obtains the attenuation characteristic of ultrasonic wave passing through UHV GIL linear unit, gas basin insulator and expansion joints, acquires the arrangement method of ultrasonic sensors on GIL single-chamber in Sutong project, and makes some suggestions for the subsequent research work. The research results show that the ultrasonic wave attenuation is about 60% after passing through the 36 m GIL linear unit, and about 70% and 89% after passing through the gas basin insulator and the expansion joints. So the fault location accuracy requirements can be achieved by arranging two or three ultrasonic sensors on GIL single air chamber in the Sutong project.

关 键 词：UHV GIL 超声波 苏通工程 故障定位 

分 类 号：TM721[电气工程—电力系统及自动化]