【摘要】：高溫超導變壓器具有體積小、重量輕、損耗小、性能穩(wěn)定、無污染等顯著優(yōu)點。然而運行于電力系統(tǒng)中的超導變壓器失超是一個比較嚴重的問題,將直接危害到設(shè)備和系統(tǒng)的安全,對高溫超導變壓器提供檢測和保護是超導變壓器安全與穩(wěn)定運行的重要基礎(chǔ),因此研究超導變壓器的失超檢測與保護技術(shù)具有重要的理論和現(xiàn)實意義。論文在分析了高溫超導體的基本特性和超導變壓器運行特性的基礎(chǔ)上,研究了超導變壓器的失超檢測和保護方法。在不同峰值的交流過電流下,通過對Bi-2223/Ag高溫超導帶材的失超特性實驗研究,得到了高溫超導帶材的臨界電流隨磁場強度的增大而減��；同時對高溫超導帶材Bi2223的電磁特性進行了分析,為高溫超導變壓器的優(yōu)化設(shè)計提供理論指導；對變壓器的空載合閘和內(nèi)部突然短路故障的瞬變過程進行了理論研究,利用Matlab/Simulink對其分別進行了仿真模擬,為高溫超導變壓器的失超保護策略提供了理論基礎(chǔ)；分析了超導變壓器失超機理和失超檢測原理,通過實驗分析論證了相位差變化的失超檢測原理,研究了一種基于相關(guān)函數(shù)的失超檢測方法。論文分析了超導繞組的失超發(fā)展特性,發(fā)現(xiàn)了超導繞組通常失超開始于某一點同時以一定的速度傳播,最初的失超點是超導繞組的熱點,其溫度為最大溫度Tmax,Tmax必須限制在某一值,以限制熱應(yīng)力和避免材料損壞。超導變壓器失超保護的實質(zhì)是保護超導線圈,在比較分析幾種超導線圈失超保護電路后,提出了超導線圈的失超保護有效手段是使失超時的熱點溫度和端電壓盡可能最小,失超后所有的能量都可消耗在線圈自身,為超導變壓器的保護提供了理論依據(jù)。
[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.
【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM407

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相關(guān)期刊論文 前1條

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本文編號：2356494