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[优秀毕业设计精品] 110kV电力变压器结构与电磁计算.doc

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[优秀毕业设计精品] 110kV电力变压器结构与电磁计算.doc

学士学位论文I110kV电力变压器结构与电磁计算摘要电力变压器是电力系统中的一种重要设备,其发展趋势是提高可靠性、节省材料、低损耗水平,明显缩短产品的设计周期、降低生产成本和提高产品的质量,从而增强产品的市场竞争力,取得显著的社会经济效益,因此电力变压器的电磁计算就显得尤为重要。本文在参考大量文献的基础上,分析了我国电力变压器行业的现状和发展趋势,阐述了电力变压器的基本原理和基本结构特征,根据电力变压器设计的基本思路,按照目前变压器设计的一般方法,完成了一台40000kVA/110kV有载调压电力变压器的计算工作,主要内容包括阻抗电压、空载、负载损耗、温升、短路电动力等的计算。电磁计算结果满足国家标准和技术参数的要求。本文还针对电力变压器的空载损耗、负载损耗、噪音、温升、局放、渗漏及抗短能力,介绍了如何改进变压器的结构以降低空载损耗和负载损耗、噪音、局放及提高抗短路能力,并达到防渗漏的效果。关键词电力变压器电磁计算结构改进学士学位论文IITheStructureandElectromagneticalCalculationof110kVPowerTransformerAbstractThefurtherdevelopmentofpowertransformer,whichisanimportantequipmentinpowersystem,istoimprovetheliability,savematerialandreduceloss,obviouslyshortenproductdesignperiod,reducethecost,improveproductquality,strengthenthemarketcompetitivenessandgaindistincteconomicperformance.Therefore,theelectromagneticalcalculationofpowertransformerisespeciallyimportant.Basedontheinformationandextensiveliterature,thisarticleanalyzesthepresentbasicprincipleandbasicstructureofpowertransformer,andalso,thepresentsituationandthedevelopmentofourcountryspowertransformerindustry.Accordingtothegeneraldesigningmethodandthebasicdesigningideasofpowertransformer,awholeelectromagneticcalculationofa40000kVA/110kVOLTCpowertransformerhasbeencompletedinthearticle.Theresultsoftheelectromagneticcalculationmeettherequirementsofnationalstandardsandtechnicalparameters,includingthemaincontentsofimpedancevoltage,loadandnoloadloss,temperaturerise,shortcircuitelectromagneticalforceandsoon.AsdevelopmentofChinesetransformermanufacturetechnology,themanufacturetechniqueof110kVdomesticpowertransformerisbeingclosetoorreachtotheadvancedlevelofforeigntransformer.Thisarticleintroduceshowtoimprovethestructureofthetransformerinordertoreducenoloadloss,loadloss,noise,PD,themagneticleakageandtoimprovetheantishortcircuitcapacity.Keywordspowertransformerelectromagneticcalculationstructureimprovement学士学位论文1目录摘要.......................................................................................................................IAbstract................................................................................................................II第1章绪论........................................................................................................31.1课题背景...................................................................................................31.1.1课题的国内外研究现状与趋势........................................................31.2变压器的工作原理与结构.......................................................................41.2.1变压器的基本工作原理....................................................................41.2.2电力变压器基本结构........................................................................5第2章电力变压器电磁计算............................................................................82.1技术条件...............................................................................................82.2额定电压和电流的计算...........................................................................82.2.1高、低压线圈额定电压计算............................................................82.2.2高低压线圈电流计算........................................................................82.3铁芯主要尺寸的确定...............................................................................92.3.1铁芯直径选择....................................................................................92.3.2铁芯截面积计算................................................................................92.4线圈匝数计算.........................................................................................102.4.1初选每匝电压..................................................................................102.4.2低压线圈匝数确定..........................................................................112.4.3高压线圈匝数确定..........................................................................112.4.4电压比校核......................................................................................112.5线圈几何尺寸的计算.............................................................................132.5.1导线选取..........................................................................................132.5.2线段排列..........................................................................................142.5.3线圈高度计算..................................................................................152.5.4线圈辐向宽度..................................................................................152.5.5绝缘半径及窗高..............................................................................152.5.6导线长度..........................................................................................162.5.7线圈直流电阻..................................................................................172.5.8导线重量计算..................................................................................172.6阻抗电压计算.........................................................................................182.6.1额定分接阻抗电压..........................................................................182.6.2最大分接的阻抗电压......................................................................20学士学位论文22.6.3最小分接阻抗电压..........................................................................212.7负载损耗和空载损耗.............................................................................222.7.1负载损耗..........................................................................................222.7.2铁芯柱与铁轭重量......................................................................232.8温升计算.................................................................................................252.8.1高压线圈温升..................................................................................252.8.2低压线圈温升..................................................................................262.8.3油对空气温升..................................................................................272.8.4油箱尺寸..........................................................................................282.9变压器短路电动力计算.........................................................................292.9.1安匝平衡计算..............................................................................292.9.2短路时绕组导线上应力计算..........................................................312.10变压器重量计算...................................................................................332.10.1油重量计算....................................................................................332.10.2器身重............................................................................................342.10.3油箱重量........................................................................................342.10.4附件重............................................................................................352.10.5变压器总重................................................................................352.11电磁计算的小结...................................................................................35第3章变压器结构改进..................................................................................363.1变压器结构改进措施.............................................................................363.2本章小结.................................................................................................39结论....................................................................................................................40致谢....................................................................................................................41参考文献............................................................................................................42附录....................................................................................................................43

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