本文選題：變壓器 + 繞組變形�。� 參考：《華北電力大學(xué)(北京)》2017年碩士論文

【摘要】：變壓器是電力傳輸中的核心設(shè)備之一。變壓器繞組變形故障是變壓器的常見故障之一,特別是在發(fā)生短路后,要及時對繞組進(jìn)行診斷,判斷是否變形。人類的生產(chǎn)生活都要求保證電力的持續(xù)供應(yīng),減少停電次數(shù)。對于繞組變形檢測,現(xiàn)場目前都是在變壓器離線條件下進(jìn)行的,本文追求的目標(biāo)是實現(xiàn)帶電檢測。繞組發(fā)生變形后,繞組等效網(wǎng)絡(luò)傳遞函數(shù)的零點、極點會發(fā)生變化,進(jìn)而引起幅頻響應(yīng)的改變。頻率響應(yīng)法是目前離線檢測變壓器繞組變形缺陷的主要方法之一,將其應(yīng)用于在線運行的變壓器時,主要存在兩個問題,一是需要解決如何向帶電運行的變壓器繞組注入激勵信號和檢測響應(yīng)信號,另一個是如何消除與變壓器繞組直接相連的外部設(shè)備的影響。本文針對有中性點引出的星形接法變壓器,提出了通過磁場耦合的方法,利用羅氏線圈向繞組耦合注入掃頻激勵信號,同時利用羅氏線圈放在高壓套管根部,測量電流響應(yīng)信號;設(shè)計了所需要的羅氏線圈,進(jìn)行了離線驗證試驗,試驗表明磁場耦合的方式是可行性,解決了變壓器在線運行時獲得繞組幅頻響應(yīng)曲線的問題。在以電壓信號為激勵,電流信號為響應(yīng)獲得繞組等效網(wǎng)絡(luò)的幅頻響應(yīng)函數(shù)后,理論分析和仿真研究了外部設(shè)備的影響和消除方法,得到繞組等效網(wǎng)絡(luò)的傳遞函數(shù)的零點不受外部設(shè)備的影響,提出了將幅頻響應(yīng)曲線上零點對應(yīng)的點是否變化作為繞組變形的判據(jù),仿真結(jié)果驗證了這種方法的正確性,并試驗驗證了零點不受外部設(shè)備的影響。
[Abstract]:Transformer is one of the core equipments in power transmission. Transformer winding deformation fault is one of the common faults of transformer, especially after the short circuit occurs, the winding should be diagnosed in time to judge whether it is deformed or not. The production and life of human are required to ensure the continuous supply of electricity and reduce the number of power outages. The detection of winding deformation is carried out under the condition of transformer off-line at present. The aim of this paper is to realize live detection. After the winding is deformed, the zero of the equivalent network transfer function and the pole will change, which will cause the change of the amplitude frequency response. Frequency response method is one of the main methods for detecting transformer winding deformation defects. There are two main problems in the application of frequency response method to the on-line operation of transformers. One is to solve the problem of how to inject excitation signals and detect response signals into transformer windings running live, and the other is to eliminate the influence of external equipments directly connected to transformer windings. In this paper, a magnetic field coupling method is proposed for star-connected transformers with neutral points, in which the Roche coil is used to inject the sweep frequency excitation signal into the winding coupling, and the Roche coil is placed at the root of the high voltage casing. The current response signal is measured, the Roche coil is designed and the off-line verification test is carried out. The experiment shows that the magnetic field coupling method is feasible and solves the problem of obtaining the winding amplitude-frequency response curve during the on-line operation of the transformer. After the amplitude-frequency response function of the equivalent winding network is obtained by using the voltage signal as the excitation and the current signal as the response, the influence of the external equipment and the elimination method are theoretically analyzed and simulated. It is obtained that the zero point of the transfer function of the equivalent winding network is not affected by the external equipment. Whether the zero point corresponding to the amplitude-frequency response curve is changed is taken as the criterion of winding deformation. The simulation results verify the correctness of this method. The experimental results show that the zero point is not affected by the external equipment.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM41

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本文編號：2055331