高电压技术
高電壓技術
고전압기술
HIGH VOLTAGE ENGINEERING
2012年
8期
1988-1994
,共7页
井永腾%李岩%额尔和木巴亚尔
井永騰%李巖%額爾和木巴亞爾
정영등%리암%액이화목파아이
自耦变压器%磁屏蔽%涡流损耗%漏磁场%有限元法(FEM)%非线性涡流场
自耦變壓器%磁屏蔽%渦流損耗%漏磁場%有限元法(FEM)%非線性渦流場
자우변압기%자병폐%와류손모%루자장%유한원법(FEM)%비선성와류장
auto-transformer%magnetic shield%eddy current loss%leakage magnetic field%finite element method(FEM)%nonlinear eddy current field
为应对大型电力变压器漏磁场及杂散损耗问题,采用三维非线性涡流场有限元分析方法,以1台高压自耦变压器为研究对象,引入B-H曲线来描述非线性材料的磁特性,对变压器结构件进行了漏磁场及涡流损耗计算。采用屏蔽措施之前,油箱及夹件等结构件涡流损耗及涡流损耗密度较大,容易引起局部过热问题并且影响变压器正常运行。通过进一步分析,给出了油箱磁屏蔽、夹件L型磁屏蔽和肺叶式磁屏蔽等降低杂散损耗的措施,以及多种屏蔽形式对漏磁场及结构件涡流损耗的影响。结果表明对电力变压器油箱、夹件等结构件采取合理的磁屏蔽措施能够有效地降低杂散损耗并消除热点,不同屏蔽形式对其周围结构件涡流损耗及漏磁场具有不同影响。
為應對大型電力變壓器漏磁場及雜散損耗問題,採用三維非線性渦流場有限元分析方法,以1檯高壓自耦變壓器為研究對象,引入B-H麯線來描述非線性材料的磁特性,對變壓器結構件進行瞭漏磁場及渦流損耗計算。採用屏蔽措施之前,油箱及夾件等結構件渦流損耗及渦流損耗密度較大,容易引起跼部過熱問題併且影響變壓器正常運行。通過進一步分析,給齣瞭油箱磁屏蔽、夾件L型磁屏蔽和肺葉式磁屏蔽等降低雜散損耗的措施,以及多種屏蔽形式對漏磁場及結構件渦流損耗的影響。結果錶明對電力變壓器油箱、夾件等結構件採取閤理的磁屏蔽措施能夠有效地降低雜散損耗併消除熱點,不同屏蔽形式對其週圍結構件渦流損耗及漏磁場具有不同影響。
위응대대형전력변압기루자장급잡산손모문제,채용삼유비선성와류장유한원분석방법,이1태고압자우변압기위연구대상,인입B-H곡선래묘술비선성재료적자특성,대변압기결구건진행료루자장급와류손모계산。채용병폐조시지전,유상급협건등결구건와류손모급와류손모밀도교대,용역인기국부과열문제병차영향변압기정상운행。통과진일보분석,급출료유상자병폐、협건L형자병폐화폐협식자병폐등강저잡산손모적조시,이급다충병폐형식대루자장급결구건와류손모적영향。결과표명대전력변압기유상、협건등결구건채취합리적자병폐조시능구유효지강저잡산손모병소제열점,불동병폐형식대기주위결구건와류손모급루자장구유불동영향。
In order to analyze the leakage magnetic field and eddy current losses in large-scale power transformer,taking the nonlinear magnetic B-H characteristics of core,tank and magnetic shield material into account,we computed the leakage magnetic field and eddy current loss in tank,yoke clamps,and other conductive construction parts of high voltage auto-transformer by three-dimensional（3D）nonlinear time harmonic finite element method.The results show that eddy current losses and loss density in tank wall and yoke clamps are large,may cause local overheating,and affect normal operation of the transformer.The magnetic shields added to tank wall and yoke clamps were used to reduce the eddy current loss in tank wall and yoke clamps of power transformer,and effects of those shields on leakage magnetic field and eddy current loss of construction parts were discussed.The results show that eddy current losses and hot spots can be reduced and eliminated effectively by adding magnetic shield to tank wall and yoke clamps.The different types of shields have different influences on leakage magnetic field and eddy current losses in construction parts of transformer.
