本文選題：干式空心電抗器 + 不平衡電流　； 參考：《重慶理工大學(xué)》2017年碩士論文

【摘要】：干式空心電抗器具有價(jià)格低、結(jié)構(gòu)簡單、重量輕、電抗值線性、損耗低、維護(hù)方便等技術(shù)優(yōu)勢(shì),已廣泛應(yīng)用于現(xiàn)代電力系統(tǒng)中并起到無功補(bǔ)償、高次諧波抑制、特高壓輸電濾波、中性點(diǎn)接地、沖擊電流、短路電流抑制等作用,是保證電力系統(tǒng)安全、穩(wěn)定運(yùn)行的重要設(shè)備。然而,干式空心電抗器在運(yùn)行中易出現(xiàn)短路、斷線,匝間放電等故障,這嚴(yán)重降低了電力系統(tǒng)的穩(wěn)定,因此電抗器的故障檢測意義重大。在電力系統(tǒng)中,當(dāng)前投入使用的檢測方法如阻抗檢測、溫度檢測、零序功率檢測等方法靈敏度低。因此,研究更靈敏的故障檢測方法對(duì)電抗器及電力系統(tǒng)的穩(wěn)定具有極大的實(shí)際價(jià)值。本文首先針對(duì)干式空心電抗器故障檢測靈敏度的不足,提出了故障不平衡電流檢測法。這種方法利用干式空心電抗器結(jié)構(gòu)的對(duì)稱性,通過測量干式空心電抗器故障后其匯流母排產(chǎn)生的不平衡電流,從而判斷其是否發(fā)生故障。其次,建立了單包封四繞組干式空心電抗器的物理模型,在此基礎(chǔ)上利用解析法得到了匯流母排電流的數(shù)學(xué)解析模型。物理模型和對(duì)應(yīng)的數(shù)學(xué)解析模型均包括無故障、單匝短路、兩繞組匝間短路、多繞組匝間短路、斷線五種情況。以上五種模型均計(jì)算了干式空心電抗器各匯流母排電流,并采用matlab進(jìn)行仿真計(jì)算,分析了故障前后各匯流母排不平衡電流的分配規(guī)律及相位變化規(guī)律。對(duì)比分析發(fā)現(xiàn)不平衡電流法比依托相位變化的零序功率方向保護(hù)法效果更好,同時(shí)還發(fā)現(xiàn)五種故障中兩繞組匝間短路故障最難檢測。最后,本文對(duì)最難檢測的兩繞組匝間短路模型從穩(wěn)態(tài)與暫態(tài)兩個(gè)方面進(jìn)行了實(shí)驗(yàn)研究,分析了母排電流的穩(wěn)態(tài)數(shù)據(jù)與暫態(tài)波形,得到了不平衡電流與短路位置的關(guān)系,進(jìn)一步驗(yàn)證了故障不平衡電流法的可行性。并根據(jù)干式空心故障不平衡電流法搭建了無線檢測系統(tǒng)。本研究對(duì)空心電抗器故障檢測以及電抗器的制造都具有重要意義。
[Abstract]:The dry hollow reactor has the advantages of low price, simple structure, light weight, linear reactance value, low loss and convenient maintenance. It has been widely used in modern power system and has played a reactive power compensation, high harmonic suppression, etc.UHV transmission filtering, neutral grounding, impulse current, short circuit current suppression and so on, are important equipment to ensure the safe and stable operation of power system.However, the dry type hollow reactor is prone to short-circuit, breakage, inter-turn discharge and other faults in operation, which seriously reduces the stability of power system, so the fault detection of reactor is of great significance.In power system, the current detection methods, such as impedance detection, temperature detection, zero-sequence power detection, are of low sensitivity.Therefore, it is of great practical value to study more sensitive fault detection methods for reactor and power system stability.In this paper, the fault unbalance current detection method is proposed to solve the problem of fault detection sensitivity of dry hollow reactor.By using the symmetry of the dry hollow reactor structure, the unbalanced current produced by the busbar of the dry hollow reactor is measured after the failure of the dry type hollow reactor, and the failure of the reactor can be judged by this method.Secondly, the physical model of the single-encapsulated four-winding dry hollow reactor is established, and the mathematical analytical model of the busbar current is obtained by using the analytical method.Both the physical model and the corresponding mathematical analytical model include five cases: no fault, single turn short circuit, two winding inter-turn short circuit, multi-winding inter-turn short circuit, and broken wire.All of the above five models have calculated the busbar current of the dry hollow reactor and simulated it by matlab, and analyzed the distribution law and phase change law of the unbalanced current of each busbar before and after the failure.It is found that the unbalanced current method is more effective than the zero-sequence power direction protection method based on phase change. At the same time, it is found that the two-winding inter-turn short circuit fault is the most difficult to detect among the five kinds of faults.Finally, the most difficult two-winding inter-turn short circuit model is experimentally studied from two aspects of steady state and transient state. The steady state data and transient waveform of the bus current are analyzed, and the relationship between the unbalanced current and the short circuit position is obtained.The feasibility of fault unbalanced current method is further verified.The wireless detection system is built according to the dry hollow fault unbalanced current method.This study is of great significance to the fault detection of hollow reactor and the manufacture of reactor.
【學(xué)位授予單位】：重慶理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM47

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本文編號(hào)：1738902