【作者】 王波；

【导师】 段建东； 武瑞；

【作者基本信息】 西安理工大学 ， 电气工程（专业学位）， 2020， 硕士

【摘要】 近些年,电力系统随着规模性发展,对其安全运行提出了越来越高的要求。气体绝缘全封闭组合电器(GIS)因结构紧凑、占地面积小、运行可靠性高等优势,广泛应用于各电压等级的电力系统。考虑到GIS设备的绝缘缺陷可能直接影响到系统安全性,掌握GIS设备的内部绝缘缺陷,特别是通过监测局部放电现象判断绝缘劣化程度及时发现设备故障,显得尤为重要。本文首先在比较各种局部放电监测原理及方法基础上,分析了 GIS局部放电的常见原因、表现特征及其危害,得出超高频检测法在GIS局部放电监测中的可行性;其次,详细研究分析了 GIS局部放电的等效电路及超高频传播特性理论,就某应用超高频的GIS局放在线监测系统,从硬件到软件做了设计及应用说明,并通过现场模拟放电试验由系统成功捕捉到信号并得到放电图谱。然后介绍了局放在线监测系统在出厂及现场安装前进行的一些必要试验。最后,提出了本工程现场安装配置方案,并进行了现场检测试验,与超高频便携式检测仪检测到数据进行比较,说明该系统数据采集的有效性和可靠性,并进一步通过系统检测到放电量正确判断是否发生局部放电等设备绝缘故障。通过系统在现场应用中总结了一些问题及解决方案。本文研究在提升GIS设备运行的可靠性方面,对系统实现状态监测及掌握设备绝缘情况具有工程指导意义。更多还原

【Abstract】 In recent years,with the development of the scale,more and more high requirements have been put forward for the safe operation of power system.Due to the advantages of compact structure,small floor space and high reliability,GIS is widely used in power systems of various voltage levels.Considering that the insulation defects of GIS equipment may directly affect the system security,it is particularly important to master the internal insulation defects of GIS equipment,especially to judge the insulation deterioration degree by monitoring the partial discharge phenomenon and find the equipment fault in time.Firstly,based on the comparison of various pd monitoring principles and methods,this paper analyzes the common causes,performance characteristics and harms of GIS PD,and concludes the feasibility of UHF detection method in GIS PD monitoring.Secondly,the equivalent circuit of PARTIAL discharge in GIS and the theory of UHF propagation characteristics are studied and analyzed in detail.The hardware and software of a certain UHF GIS station on-line monitoring system are designed and explained,and the signals are successfully captured by the system through field simulated discharge test and the discharge spectrum is obtained.Then it introduces some necessary tests of the in-line monitoring system before delivery and field installation.Finally,the project site installation configuration was introduced,and the field test,compared with ultra-high frequency portable detector to detect data illustrate the validity and reliability of the data acquisition system,and further through the system detects discharge right judgment whether partial discharge equipment insulation fault has occurred.Some problems in the field operation of the system are summarized.This paper studies the reliability of GIS equipment operation,which has the engineering guiding significance for the system to realize the state monitoring and master the insulation condition of equipment.更多还原