本文關(guān)鍵詞： 變壓器繞組 多次短路 強(qiáng)度 累積形變 穩(wěn)定性　出處：《沈陽工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：本文在全面深入地總結(jié)了變壓器繞組短路強(qiáng)度和穩(wěn)定性研究現(xiàn)狀的基礎(chǔ)上,從變壓器短路試驗?zāi)Ｐ腿胧?采用有限元法對模型進(jìn)行多物理場耦合分析,掌握繞組電磁分布,電磁力變化規(guī)律和繞組形變規(guī)律。分別對多次短路下變壓器繞組輻向強(qiáng)度和穩(wěn)定性進(jìn)行了仿真計算,求解出了繞組的累積形變和臨界失穩(wěn)載荷,并且進(jìn)一步探討了短路電流和撐條結(jié)構(gòu)對繞組強(qiáng)度的影響。通過結(jié)構(gòu)力場分析,計算了多次短路下變壓器繞組的端圈應(yīng)力,在此基礎(chǔ)上進(jìn)一步計算了繞組的自然頻率,并且探討了繞組墊塊的預(yù)壓處理對多次短路下變壓器繞組自然頻率的影響。首先,基于電磁分析和結(jié)構(gòu)分析的基本原理,選取變壓器短路試驗?zāi)Ｐ妥鳛榛狙芯磕Ｐ?對變壓器短路下的繞組電磁場、結(jié)構(gòu)力場等多物理場進(jìn)行了分析。利用簡化模型對短路模型進(jìn)行了詳細(xì)的電磁過程分析,并對繞組受力及其運動方程進(jìn)行了推導(dǎo)。重點采用ANSYS多物理場耦合軟件,建立了該變壓器短路試驗?zāi)Ｐ偷娜S有限元模型,并對其進(jìn)行了多物理場耦合計算分析。其次,全面分析了變壓器繞組在多次短路下產(chǎn)生累積形變的原因及過程,并且提出了多次短路下變壓器繞組輻向強(qiáng)度的有限元計算方法,通過對變壓器試驗?zāi)Ｐ偷脑囼灉y量,驗證了有限元計算方法的有效性和可靠性。對比分析了繞組在不同短路電流峰值下,短路沖擊次數(shù)和峰值持續(xù)時間對變壓器繞組累積形變過程的影響。針對變壓器繞組的撐條特性,研究了不同撐條個數(shù)、不同撐條寬度下繞組輻向形變規(guī)律。另外,基于彈支梁模型對變壓器繞組在多次短路下的輻向穩(wěn)定性進(jìn)行了計算分析,討論了繞組的輻向累積形變對繞組臨界失穩(wěn)載荷的影響。最后,基于變壓器繞組軸向振動的基本原理,采用“質(zhì)量-彈簧模型”,針對實例變壓器繞組進(jìn)行了結(jié)構(gòu)力場計算分析,得出了多次短路下變壓器繞組各線餅和端圈的應(yīng)力分布規(guī)律。通過模態(tài)分析,對比分析了繞組在短路前后的前六階振型,并且計算了繞組在短路前后的自然振動頻率。采用瞬態(tài)激振法和頻譜分析法對繞組自然振動頻率進(jìn)行了試驗測量,驗證了有限元計算方法的有效性和可靠性。最后重點探討了墊塊預(yù)壓處理對繞組自然頻率的影響。
[Abstract]:On the basis of summarizing the research status of short circuit strength and stability of transformer windings in an all-round way, this paper starts with transformer short-circuit test model and uses finite element method to analyze the multi-physical field coupling of the model. The electromagnetic distribution of windings, the law of electromagnetic force variation and the law of winding deformation are grasped. The radial strength and stability of transformer windings under multiple short-circuit are simulated and calculated respectively. The cumulative deformation and critical instability load of the windings are solved, and the influence of the short circuit current and the strut structure on the winding strength is further discussed. The end coil stress of transformer winding under multiple short circuit is calculated, and the natural frequency of the winding is further calculated. The influence of preloading on the natural frequency of transformer windings is discussed. Firstly, based on the basic principles of electromagnetic analysis and structure analysis. The transformer short-circuit test model is selected as the basic research model to study the electromagnetic field of the transformer windings under short circuit. The structure force field and other multi-physical fields are analyzed, and the electromagnetic process of the short-circuit model is analyzed in detail by using the simplified model. The stress on the winding and its equation of motion are deduced, and the 3D finite element model of the short-circuit test model of the transformer is established by using the ANSYS multi-physical field coupling software. And the multi-physical field coupling analysis is carried out. Secondly, the cause and process of cumulative deformation of transformer windings under multiple short-circuit are analyzed. A finite element method for calculating the radial strength of transformer windings under multiple short circuits is proposed. The transformer test model is tested and measured. The validity and reliability of the finite element method are verified. The influence of short circuit impact times and peak duration on the cumulative deformation process of transformer windings. In addition, based on the elastic beam model, the radial stability of transformer windings under multiple short circuits is calculated and analyzed. The influence of the cumulative radial deformation of the winding on the critical unstable load of the winding is discussed. Finally, based on the basic principle of the axial vibration of the transformer winding, the mass-spring model is adopted. Based on the calculation and analysis of the structural force field of transformer windings, the stress distribution law of each wire cake and end ring of transformer windings under multiple short circuit is obtained, and the modal analysis is carried out. The first six vibration modes of the winding before and after the short circuit are compared and the natural vibration frequency of the winding before and after the short circuit is calculated. The natural vibration frequency of the winding is measured by the transient excitation method and the spectrum analysis method. The validity and reliability of the finite element method are verified. Finally, the influence of preloading on the natural frequency of winding is discussed.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【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：1474201