变电站容性设备在线监测与故障分析研究

发布时间：2019-04-25 16:03

【摘要】：高压电容型设备是电力系统的重要组成部分,主要包括电容型高压套管、电流互感器、电容式电压互感器、耦合电容器等,它们的可靠性直接影响着电网的运行安全。电容型设备在线监测可以随时监测设备状态信息,为设备的状态评价和检修策略的制定提供依据。但是同时也提出了一个问题,在线监测的可靠性和测试的准确度是否足够?是否存在干扰而导致误报和错报?有么有什么方法可以排除干扰?这些都将影响检修人员对设备运行情况的判断以及在线监测系统在故障分析中的应用。本文针对上述问题展开研究。首先阐述了电气设备在线监测的背景与意义,通过查阅资料,深入了解了国内外电气设备在线监测的研究现状以及实际执行过程中存在的问题。然后从变电站电容型设备的在线监测装置的结构出发,熟悉了解福州地区在用的在线监测系统的组成及功能,从电压监测单元、电容型高压设备监测单元、线路容性设备检测单元、环境监测单元等多个方面挖掘该系统的优势和不足；了解OMDS系统的结构和使用方法,分析了系统中可能影响监测数据的因素,并提出解决办法,即采用相对值法带电测试作为在线监测系统的补充。接着,作者通过模拟试验和现场试验,验证了相对值法带电测试的有效性和数据的稳定性,明确了其在故障分析与诊断中起到的作用；并通过例举电容型设备故障的典型案例,阐述了综合应用在线监测系统、相对值法带电测试及历年停电数据对设备的故障开展分析与诊断的思路,并提出相应的数据分析方法。文章最后总结了相对值法带电测试在福州地区的开展情况。
[Abstract]:High-voltage capacitive equipment is an important part of power system, including capacitive high-voltage casing, current transformer, capacitive voltage transformer, coupling capacitor and so on. Their reliability directly affects the safety of power network operation. The on-line monitoring of capacitive equipment can monitor the state information of equipment at any time, which provides the basis for the evaluation of equipment condition and the formulation of maintenance strategy. However, it also raises the question whether the reliability of on-line monitoring and the accuracy of testing are sufficient. Is there interference resulting in misreporting and misreporting? Is there any way to eliminate interference? All of these will affect the maintenance personnel's judgment on the operation of the equipment and the application of on-line monitoring system in fault analysis. This paper focuses on the above-mentioned problems. Firstly, the background and significance of on-line monitoring of electrical equipment are expounded. By consulting the data, the research status of on-line monitoring of electrical equipment at home and abroad and the problems existing in the process of practical implementation are deeply understood. Then, starting from the structure of on-line monitoring device of capacitance-type equipment in substation, we are familiar with the composition and function of on-line monitoring system in Fuzhou area, from the voltage monitoring unit and capacitive high-voltage equipment monitoring unit, The advantages and disadvantages of the system are excavated from several aspects such as capacitive equipment detection unit and environmental monitoring unit. In this paper, we understand the structure and usage of OMDS system, analyze the factors that may affect the monitoring data in the system, and put forward the solution, that is, the live test of relative value method is used as a supplement to the on-line monitoring system. Then, through simulation test and field test, the author verifies the validity of the relative value method and the stability of the data, and clarifies its role in fault analysis and diagnosis. Through examples of typical fault cases of capacitive equipment, this paper expounds the train of thought of comprehensive application of on-line monitoring system, relative value method of live test and years of blackout data to analyze and diagnose the fault of equipment, and puts forward the corresponding data analysis method. Finally, the paper summarizes the relative value of live test in Fuzhou area.
【学位授予单位】：福州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM63

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