特高压交流变压器工程应用关键技术研究

发布时间：2018-11-05 08:29

【摘要】：作为特高压电网中的核心设备之一,特高压交流变压器的工程应用技术随着特高压电网建设步伐的加快受到了越来越多的关注。论文是在综合分析目前国内外技术资料和总结以往实践经验的基础上,对特高压交流变压器的设计选型以及现场安装、试验、调试环节的关键技术进行了研究与分析。通过对变压器整体结构型式、调压方式、冷却方式、变电容量、第三侧电压、阻抗电压等内容的分析与研究,选择了采用单相、自耦、本体变与调压补偿变分体布置的变压器作为应用于工程实践的特高压交流变压器,同时确定了采用中性点变磁通调压方式和强迫油循环非导向冷却方式以及变压器容量、第三侧电压值、阻抗电压值及内绝缘水平。通过对全密封绝缘油净化处理系统的整体设计以及对滤油设备、绝缘油净化处理方法的研究与分析,提出了全密封绝缘油净化处理系统的配置要求、完善了其使用功能,优化了滤油方法,并对颗粒度指标控制提出了针对性措施,解决了工程现场对绝缘油指标控制严以及净化工作量大的实际问题。通过对变压器高压出线装置与高压套管吊装、抽真空与真空注油、热油循环等安装作业流程的分析,明确了高压出线装置与高压套管的吊装方法以及抽真空时间与真空度控制、注油速度与油温控制、热油循环时间控制等技术要求。通过对本体变、调压补偿变绕组连同套管的感应耐压带局放测量试验的加压程序、试验判据的分析与试验设备参数选择的计算,提出了工程现场试验工作步骤以及主要的抗干扰措施。通过对调压补偿变压器差动保护电流互感器的极性分析,明确了差动保护配置要求,并对指定档位下的平衡系数与差动电流进行了计算,同时完成了电流互感器极性变化准确性的现场校验。通过对变压器设计选型与现场安装、试验、调试各应用环节关键技术的研究与分析,对后续更进一步提升工程现场应用技术水平与变压器长期安全运行都具有很重要的现实意义。
[Abstract]:As one of the core equipment in UHV power grid, the engineering application technology of UHV AC transformer has been paid more and more attention with the acceleration of UHV power grid construction. On the basis of synthetically analyzing the domestic and foreign technical data and summarizing the previous practical experience, this paper studies and analyzes the key technologies of the design, selection, field installation, test and debugging of UHV AC transformers. Through the analysis and research on the whole structure type of transformer, voltage regulation mode, cooling mode, transformer capacity, third side voltage, impedance voltage and so on, the single phase, auto coupling, etc. The transformer arranged by bulk transformer and voltage regulation compensation variable body is used as UHV AC transformer applied in engineering practice. At the same time, the neutral point variable flux regulation mode, forced oil cycle unguided cooling mode and transformer capacity are determined. Third side voltage, impedance voltage and internal insulation level. Through the research and analysis of the whole design of the purifying treatment system for the fully sealed insulating oil and the research and analysis of the oil filter equipment and the method of purifying and treating the insulating oil, the configuration requirements of the purifying treatment system for the fully sealed insulating oil are put forward, and the use function of the system is improved. The oil filter method is optimized, and the corresponding measures are put forward to control the particle size index, which solves the practical problems of strict control of insulation oil index and large amount of purification work in the engineering site. Through the analysis of the installation operation flow of transformer high-voltage outlet device and high-voltage casing, vacuum pumping and vacuum oil injection, hot oil circulation and so on, the hoisting method of high-voltage outlet device and high-voltage casing, as well as the vacuum time and vacuum degree control are defined. Oil injection speed and oil temperature control, hot oil cycle time control and other technical requirements. Through the pressurization program of the partial discharge measurement test of inductive pressure band, the analysis of test criterion and the calculation of parameter selection of test equipment, The working steps and main anti-interference measures are put forward. Through the polarity analysis of the differential protection current transformer of the voltage regulation compensation transformer, the configuration requirements of the differential protection are clarified, and the balance coefficient and differential current under the specified gear are calculated. At the same time, the accuracy of polarity change of current transformer is verified. Through the research and analysis of the key technologies of transformer design and selection, field installation, test and debugging, It is of great practical significance to further enhance the technical level of engineering field application and the long-term safe operation of transformers.
【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】：TM41

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