本文選題：干式空心電抗器　切入點(diǎn)：空間磁場(chǎng)　出處：《山東大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：干式空心電抗器(Dry-type Air-core Reactors,DAR)憑借電抗值線(xiàn)性、結(jié)構(gòu)簡(jiǎn)單、重量輕、安裝維護(hù)方便等優(yōu)點(diǎn),在電網(wǎng)無(wú)功補(bǔ)償、濾波和限流等場(chǎng)合得到廣泛應(yīng)用。自DAR投入運(yùn)行以來(lái),出現(xiàn)了多起燒毀事故,大量分析結(jié)果表明,多數(shù)電抗器燒毀事故是由匝間短路故障引起的。為了減少DAR匝間短路故障問(wèn)題,除提高電抗器制造水平外,還必須配有有效的匝間短路故障檢測(cè)手段。但是,現(xiàn)有的匝間短路故障檢測(cè)方法都存在靈敏度低或者可靠性差等缺陷。因此,針對(duì)電抗器匝間短路故障問(wèn)題,探究一種靈敏度高、可靠性好的匝間短路故障檢測(cè)方法有著重要意義。為了研究有效的DAR匝間短路故障檢測(cè)方法,本文基于電抗器空間磁場(chǎng)分布規(guī)律開(kāi)展了一系列的研究,主要內(nèi)容有:研究DAR空間磁場(chǎng)計(jì)算方法,總結(jié)分析DAR空間磁場(chǎng)分布與匝間短路故障之間的關(guān)系,提出構(gòu)建磁場(chǎng)變化量與故障程度或位置的擬合函數(shù)以得到DAR匝間短路故障的檢測(cè)方法。探究DAR空間磁場(chǎng)計(jì)算方法對(duì)研究電抗器故障磁場(chǎng)變化規(guī)律具有重要意義。本文給出了 DAR空間磁場(chǎng)的定義,據(jù)此分析了 DAR的電氣特性與等效電路,并根據(jù)基爾霍夫定律和麥克斯韋方程組建立了 DAR等效模型。研究出一種基于有限元計(jì)算電抗器線(xiàn)圈電感和空間磁場(chǎng)分布的方法,并對(duì)電抗器線(xiàn)圈電感和空間磁場(chǎng)分別進(jìn)行有限元仿真,解析計(jì)算法對(duì)有限元仿真結(jié)果的驗(yàn)證證明了所建電抗器模型的準(zhǔn)確性與所用有限元計(jì)算法的可行性。為進(jìn)一步探索DAR匝間短路故障磁場(chǎng)分布規(guī)律,以電壓等級(jí)為35kV的并聯(lián)DAR為例,在故障模型的各不同位置設(shè)定不同程度的匝間短路故障,通過(guò)比較電抗器在不同故障下沿軸向中心軸(Axial Traverse in Center,ATC)和徑向中心軸(Lateral Traverse in Center,LTC)兩個(gè)方向的空間磁場(chǎng)分布,得出匝間短路故障對(duì)電抗器空間磁場(chǎng)的影響規(guī)律。本文基于DAR空間磁場(chǎng)變化規(guī)律提出一種匝間短路故障檢測(cè)方法。將觀測(cè)點(diǎn)磁場(chǎng)變化量和故障程度或位置作為擬合變量,分別建立了故障程度以及故障位置與觀測(cè)點(diǎn)磁場(chǎng)變化量之間的故障檢測(cè)函數(shù)。利用磁場(chǎng)變化量判斷故障的方法來(lái)驗(yàn)證故障檢測(cè)函數(shù)的應(yīng)用效果,結(jié)果顯示計(jì)算故障與實(shí)際故障誤差在可接受范圍內(nèi),證明故障檢測(cè)函數(shù)具有很好的檢測(cè)效果。
[Abstract]:Dry-type Air-core ReactorsDAR) has been widely used in reactive power compensation, filtering and current limiting since DAR was put into operation, because of its advantages of linear reactance, simple structure, light weight and convenient installation and maintenance. In order to reduce the problem of inter-turn short circuit in DAR, a large number of analysis results show that most reactor burnout accidents are caused by inter-turn short circuit fault, except to improve the manufacturing level of reactor. It must also be equipped with effective inter-turn short-circuit fault detection methods. However, the existing inter-turn short-circuit fault detection methods have some shortcomings, such as low sensitivity or poor reliability. Therefore, aiming at the problem of inter-turn short-circuit fault of reactor, It is of great significance to explore a method for detecting inter-turn short circuit fault with high sensitivity and good reliability. In order to study an effective method for detecting inter-turn short circuit fault of DAR, a series of studies are carried out based on the distribution of space magnetic field of reactor. The main contents are as follows: the calculation method of DAR space magnetic field is studied, and the relationship between DAR spatial magnetic field distribution and inter-turn short circuit fault is summarized and analyzed. A fitting function between magnetic field variation and fault degree or position is proposed to detect the inter-turn short circuit fault of DAR. It is of great significance to explore the calculation method of DAR space magnetic field for studying the variation rule of fault magnetic field of reactor. In this paper, the definition of DAR space magnetic field is given. Based on this, the electrical characteristics and equivalent circuit of DAR are analyzed. Based on Kirchhoff's law and Maxwell's equations, the equivalent model of DAR is established. A method of calculating inductance and space magnetic field distribution of reactor coil based on finite element method is developed. The inductance and space magnetic field of reactor coil are simulated by finite element method. The accuracy of the reactor model and the feasibility of the finite element method are verified by the analytical calculation method. In order to further explore the magnetic field distribution law of DAR inter-turn short-circuit fault, Taking the parallel DAR with a voltage grade of 35 kV as an example, different degrees of inter-turn short circuit faults are set at different locations of the fault model. By comparing the magnetic field distribution of the reactor along the axial axis Traverse in the ATC and the radial central axis lateral Traverse in the LTCs under different faults, the magnetic field distribution of the reactor is compared. The influence of inter-turn short circuit fault on the space magnetic field of reactor is obtained. Based on the variation rule of DAR space magnetic field, a detection method of inter-turn short circuit fault is proposed. The variation of magnetic field and the degree or position of fault at observation point are taken as fitting variables. The fault detection function between the fault location and the magnetic field variation of the observation point is established, and the application effect of the fault detection function is verified by the method of judging the fault by the variation of the magnetic field. The results show that the error between the calculation and the actual fault is within the acceptable range, and it is proved that the fault detection function has a good detection effect.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM47

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