高温超导变压器的失超检测与保护
发布时间：2018-11-25 14:50
【摘要】：高温超导变压器具有体积小、重量轻、损耗小、性能稳定、无污染等显著优点。然而运行于电力系统中的超导变压器失超是一个比较严重的问题,将直接危害到设备和系统的安全,对高温超导变压器提供检测和保护是超导变压器安全与稳定运行的重要基础,因此研究超导变压器的失超检测与保护技术具有重要的理论和现实意义。论文在分析了高温超导体的基本特性和超导变压器运行特性的基础上,研究了超导变压器的失超检测和保护方法。在不同峰值的交流过电流下,通过对Bi-2223/Ag高温超导带材的失超特性实验研究,得到了高温超导带材的临界电流随磁场强度的增大而减小；同时对高温超导带材Bi2223的电磁特性进行了分析,为高温超导变压器的优化设计提供理论指导；对变压器的空载合闸和内部突然短路故障的瞬变过程进行了理论研究,利用Matlab/Simulink对其分别进行了仿真模拟,为高温超导变压器的失超保护策略提供了理论基础；分析了超导变压器失超机理和失超检测原理,通过实验分析论证了相位差变化的失超检测原理,研究了一种基于相关函数的失超检测方法。论文分析了超导绕组的失超发展特性,发现了超导绕组通常失超开始于某一点同时以一定的速度传播,最初的失超点是超导绕组的热点,其温度为最大温度Tmax,Tmax必须限制在某一值,以限制热应力和避免材料损坏。超导变压器失超保护的实质是保护超导线圈,在比较分析几种超导线圈失超保护电路后,提出了超导线圈的失超保护有效手段是使失超时的热点温度和端电压尽可能最小,失超后所有的能量都可消耗在线圈自身,为超导变压器的保护提供了理论依据。
[Abstract]:HTS transformers have the advantages of small volume, light weight, low loss, stable performance, no pollution and so on. However, the loss of superconducting transformer in power system is a serious problem, which will directly endanger the safety of equipment and system. The detection and protection of HTS transformers is an important foundation for the safe and stable operation of HTS transformers. Therefore, it is of great theoretical and practical significance to study the technology of detecting and protecting HTS transformers. Based on the analysis of the basic characteristics of high temperature superconductors and the operation characteristics of superconducting transformers, the detection and protection methods of superconducting transformers are studied. Under different peak AC overcurrent, the critical current of Bi-2223/Ag HTS tape decreases with the increase of magnetic field intensity. At the same time, the electromagnetic characteristics of HTS tape Bi2223 are analyzed, which provides theoretical guidance for the optimal design of HTS transformer. The transient process of no-load switching and internal short-circuit fault of transformer is studied theoretically, and the simulation is carried out by Matlab/Simulink, which provides a theoretical basis for the strategy of over-protection of high-temperature superconducting transformer. In this paper, the principle of loss of superconducting transformer is analyzed, and the principle of phase difference change is proved by experiment, and a method based on correlation function is studied. The development characteristics of superconducting windings are analyzed in this paper. It is found that the superconducting windings usually start at a certain point and propagate at a certain speed at the same time. The initial breakout point is the hot spot of the superconducting winding, and its temperature is the maximum temperature Tmax,. Tmax must be limited to a certain value to limit thermal stress and avoid material damage. The essence of superconducting transformer overage protection is to protect superconducting coil. After comparing and analyzing several kinds of superconducting coil losing protection circuits, it is put forward that the effective method of superconducting coil overage protection is to minimize the hot spot temperature and terminal voltage. All the energy can be consumed in the coil itself, which provides a theoretical basis for the protection of superconducting transformers.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM407
本文编号：2356494
[Abstract]:HTS transformers have the advantages of small volume, light weight, low loss, stable performance, no pollution and so on. However, the loss of superconducting transformer in power system is a serious problem, which will directly endanger the safety of equipment and system. The detection and protection of HTS transformers is an important foundation for the safe and stable operation of HTS transformers. Therefore, it is of great theoretical and practical significance to study the technology of detecting and protecting HTS transformers. Based on the analysis of the basic characteristics of high temperature superconductors and the operation characteristics of superconducting transformers, the detection and protection methods of superconducting transformers are studied. Under different peak AC overcurrent, the critical current of Bi-2223/Ag HTS tape decreases with the increase of magnetic field intensity. At the same time, the electromagnetic characteristics of HTS tape Bi2223 are analyzed, which provides theoretical guidance for the optimal design of HTS transformer. The transient process of no-load switching and internal short-circuit fault of transformer is studied theoretically, and the simulation is carried out by Matlab/Simulink, which provides a theoretical basis for the strategy of over-protection of high-temperature superconducting transformer. In this paper, the principle of loss of superconducting transformer is analyzed, and the principle of phase difference change is proved by experiment, and a method based on correlation function is studied. The development characteristics of superconducting windings are analyzed in this paper. It is found that the superconducting windings usually start at a certain point and propagate at a certain speed at the same time. The initial breakout point is the hot spot of the superconducting winding, and its temperature is the maximum temperature Tmax,. Tmax must be limited to a certain value to limit thermal stress and avoid material damage. The essence of superconducting transformer overage protection is to protect superconducting coil. After comparing and analyzing several kinds of superconducting coil losing protection circuits, it is put forward that the effective method of superconducting coil overage protection is to minimize the hot spot temperature and terminal voltage. All the energy can be consumed in the coil itself, which provides a theoretical basis for the protection of superconducting transformers.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM407
【参考文献】
相关期刊论文 前1条
1 ;国家“西电东送”北通道重点工程750kV兰州东—白银—银川东输变电工程投运[J];电力建设;2008年09期
，本文编号：2356494
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