金属氧化锌避雷器在线监测原理及系统研究

发布时间：2018-05-08 06:11

本文选题：金属氧化锌避雷器 + 等效电路　；参考：《华北电力大学》2014年硕士论文

【摘要】：随着经济的发展,对电力系统的安全性和可靠性的要求也越来越高。其中氧化锌避雷器(Metal Oxide Surge Arrester,简称MOA)作为一种重要的过压保护电器,能有效保护其它电力设备。因其还具备反应速度快、通流能力强、体积小等众多优点,在电力系统中得到应用广泛。因此氧化锌避雷器性能的优劣直接影响电力系统的安全运行。目前,分析判断氧化锌避雷器是否存在故障,最有效的方法就是监测避雷器泄漏电流中的阻性电流。本文首先介绍金属氧化锌避雷器(MOA)的组成结构、电气性能及等值电路,阐述目前监测避雷器阻性电流特征量的主要方法和原理,如三次谐波法、补偿法、西林电桥介质损耗测量法、谐波分析法等,并对各种原理进行分析,提出各种算法的适用场合,为研究精度高、功能全的避雷器在线监测与故障诊断装置提供了理论依据。本文研究的系统由硬件和软件两部分构成,其中硬件部分由电流取样单元、电压取样单元、信号处理单元等部分组成；主要完成就地数据采集、数模转换、运算及通信功能,提供光纤冗余接口,实现装置间以及装置与后台系统间(包括CAC)通讯。软件部分由分布式实时数据库、人机交互界面等组成,将所有的单元采集的数据进行汇总,在综合考虑各种干扰因素的同时,根据数学形态学、模糊神经网络等方法,并结合避雷器专家系统、制造厂家的经验,对避雷器进行综合在线监测与故障诊断。本系统的工程应用可在避雷器发生故障之前,进行实时状态评估和分析,在第一时间内发现避雷器设备内部潜伏性故障,进而预防故障或在出现故障情况下能够有的放矢,快速排除故障,进而为电力系统的安全可靠运行提供有力保障。
[Abstract]:With the development of economy, the requirement of security and reliability of power system is higher and higher. Zinc oxide arrester Metal Oxide Surge Arrester (Moa), as an important overvoltage protector, can effectively protect other power equipment. It is widely used in power system because of its many advantages such as fast reaction speed, strong current capacity and small volume. Therefore, the performance of zinc oxide arrester directly affects the safe operation of power system. At present, the most effective method is to monitor the resistive current in the leakage current of zinc oxide arrester. This paper first introduces the composition, electrical performance and equivalent circuit of metal zinc oxide arrester MOA, and expounds the main methods and principles of monitoring the characteristic quantity of resistive current of arrester, such as third harmonic method, compensation method, etc. The method of measuring dielectric loss of Xilin bridge, harmonic analysis method and so on, and the analysis of various principles are carried out, and the application of various algorithms is put forward, which provides a theoretical basis for the research of on-line monitoring and fault diagnosis device of lightning arrester with high precision and full function. The system studied in this paper consists of two parts: hardware and software. The hardware is composed of current sampling unit, voltage sampling unit, signal processing unit and so on. Provide optical fiber redundant interface to realize communication between device and background system (including CAC). The software is composed of distributed real-time database, human-computer interface and so on. The data collected by all the units are summarized. At the same time, according to the methods of mathematical morphology, fuzzy neural network and so on, all kinds of interference factors are considered synthetically. Combined with the expert system of arrester and the experience of manufacturer, the integrated on-line monitoring and fault diagnosis of arrester are carried out. The engineering application of the system can be used to evaluate and analyze the real time state of the arrester before the failure of the arrester, and to find the internal latent fault of the arrester equipment in the first time, and then to prevent the failure or to target the lightning arrester in the event of failure. Fast troubleshooting can provide a strong guarantee for the safe and reliable operation of power system.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM862

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