750kV氧化锌避雷器带电测试研究

发布时间：2018-03-21 22:14

本文选题：氧化锌避雷器　切入点：带电测试　出处：《华北电力大学》2015年硕士论文　论文类型：学位论文

【摘要】：氧化锌避雷器具有优良的非线性和大通流容量的优点,在电力系统各电压等级的输变电设备上广泛应用。设备状况健康的氧化锌避雷器对输变电设备的正常运行能够起到很好的保护作用,相反阀片老化或受潮的氧化锌避雷器不仅无法保护设备运行,还严重影响着系统的安全稳定性。现场通常采取测试方式较灵活的带电测试以缩短测试周期、提高测试效率,弥补停电测试的不足。特别是对750kV设备,电压等级高,现场电磁环境复杂,干扰强,氧化锌避雷器在带电测试过程中受到的外部干扰比低电压等级设备严重得多,有时无法准确测得泄漏电流的阻性分量,难以真实反映避雷器的性能。本文以高电压理论为基础,分析影响带电测试结果的因素,找出影响氧化锌避雷器带电测试结果的主要和敏感性因素,针对本地区750kV氧化锌避雷器带电测试情况,进行合理的分析和思考,改进电压信号获取方式和信号传输方式,使用感应板法或直接从电容式电压互感器末屏接地端获取电压信号,使用无线高频信号避免了有线传输过程中信号因强电磁干扰失真,减少了大量的放收线工作,提高测试过程的安全性、测试的准确率和测试效率。便于科学全面的分析数据,及时准确发现750kV氧化锌避雷器内部缺陷。
[Abstract]:Zinc oxide arrester has the advantages of good nonlinearity and large current capacity. Widely used in transmission and transformation equipment of various voltage levels in power system. The zinc oxide arrester, which is in a healthy condition, can play a good protective role in the normal operation of the transmission and transformation equipment. On the contrary, the aging or dampened zinc oxide arresters not only can not protect the operation of the equipment, but also seriously affect the safety and stability of the system. Especially for 750kV equipment, the voltage grade is high, the field electromagnetic environment is complex, the interference is strong, and the external interference of zinc oxide arrester is much more serious than that of low-voltage equipment in the process of live test. Sometimes the resistive component of leakage current can not be accurately measured, and it is difficult to truly reflect the performance of arrester. Based on the theory of high voltage, this paper analyzes the factors that affect the results of live test. To find out the main and sensitive factors that affect the test results of zinc oxide arrester, and to improve the voltage signal acquisition method and signal transmission mode by reasonable analysis and thinking on the 750kV zinc oxide arrester live test in our area. By using induction plate method or directly obtaining voltage signal from the earthing end of terminal screen of capacitive voltage transformer, the use of wireless high frequency signal can avoid the distortion of signal in the process of wire transmission because of strong electromagnetic interference, and reduce a large amount of work of unwinding line. The safety of the test process, the accuracy and efficiency of the test are improved. It is convenient to analyze the data scientifically and comprehensively, and to find the internal defects of the 750kV zinc oxide arrester in time and accurately.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM862

【引证文献】