高电压技术
高電壓技術
고전압기술
HIGH VOLTAGE ENGINEERING
2012年
2期
368-375
,共8页
颜楠楠%傅正财%王国利%陈坚%孙伟
顏楠楠%傅正財%王國利%陳堅%孫偉
안남남%부정재%왕국리%진견%손위
特高压(UHV)%工频试验变压器%有限元法(FEM)模型%场强分布%局部放电%优化布置
特高壓(UHV)%工頻試驗變壓器%有限元法(FEM)模型%場彊分佈%跼部放電%優化佈置
특고압(UHV)%공빈시험변압기%유한원법(FEM)모형%장강분포%국부방전%우화포치
ultra high voltage（UHV）%power frequency test transformer%finite element method（FEM） model%electric field distribution%partial discharge%layout optimization
多级串级式无局放工频试验变压器是特高压设备研制和试验必不可少的试验设备。为此,对典型的串级工频无局放试验变压器成套设备的外电场分布开展了研究,进行了有限元法数值计算。分别讨论了变压器布置于理想户外、室内距墙10m和距墙7m这3种工况下场强分布特点以及最大场强随净距增加的变化规律,分析了工频无局放成套设备自身结构对最大场强的影响。在特有的计算条件下,比较分析3种不同分压器屏蔽顶罩型式下的场强分布。在顶罩圆环半径和球半径相近时,双环屏蔽优于孤立球屏蔽,且屏蔽圆环截面半径越大,最大电场强度越小。通过分析空间电场分布的特点,得出其它试验辅助设备和空间杂散物项发生悬浮放电的规律。当接地杆与该变压器相对距离〉10m时,一般不会发生空间悬浮电位放电;在计算模型中,灯具尺寸越小,对空间电场的影响越小,当灯罩半径〉10cm时会发生局部起晕。最后对试验空间的优化布置给出合理化建议,其可作为试验大厅设计和试验设备布置的参考依据。
多級串級式無跼放工頻試驗變壓器是特高壓設備研製和試驗必不可少的試驗設備。為此,對典型的串級工頻無跼放試驗變壓器成套設備的外電場分佈開展瞭研究,進行瞭有限元法數值計算。分彆討論瞭變壓器佈置于理想戶外、室內距牆10m和距牆7m這3種工況下場彊分佈特點以及最大場彊隨淨距增加的變化規律,分析瞭工頻無跼放成套設備自身結構對最大場彊的影響。在特有的計算條件下,比較分析3種不同分壓器屏蔽頂罩型式下的場彊分佈。在頂罩圓環半徑和毬半徑相近時,雙環屏蔽優于孤立毬屏蔽,且屏蔽圓環截麵半徑越大,最大電場彊度越小。通過分析空間電場分佈的特點,得齣其它試驗輔助設備和空間雜散物項髮生懸浮放電的規律。噹接地桿與該變壓器相對距離〉10m時,一般不會髮生空間懸浮電位放電;在計算模型中,燈具呎吋越小,對空間電場的影響越小,噹燈罩半徑〉10cm時會髮生跼部起暈。最後對試驗空間的優化佈置給齣閤理化建議,其可作為試驗大廳設計和試驗設備佈置的參攷依據。
다급천급식무국방공빈시험변압기시특고압설비연제화시험필불가소적시험설비。위차,대전형적천급공빈무국방시험변압기성투설비적외전장분포개전료연구,진행료유한원법수치계산。분별토론료변압기포치우이상호외、실내거장10m화거장7m저3충공황하장강분포특점이급최대장강수정거증가적변화규률,분석료공빈무국방성투설비자신결구대최대장강적영향。재특유적계산조건하,비교분석3충불동분압기병폐정조형식하적장강분포。재정조원배반경화구반경상근시,쌍배병폐우우고립구병폐,차병폐원배절면반경월대,최대전장강도월소。통과분석공간전장분포적특점,득출기타시험보조설비화공간잡산물항발생현부방전적규률。당접지간여해변압기상대거리〉10m시,일반불회발생공간현부전위방전;재계산모형중,등구척촌월소,대공간전장적영향월소,당등조반경〉10cm시회발생국부기훈。최후대시험공간적우화포치급출합이화건의,기가작위시험대청설계화시험설비포치적삼고의거。
Multi-stage series connection frequency test transformer without partial discharge is very important for design and experiment of ultra high voltage（UHV） equipment.We developed a finite element method（FEM） to analyze the electric field of the space with a typical series test transformer,respectively discussed the characteristics of electric field distribution for the cases that the transformer locates in ideal outdoor,10 m and 7 m away from the wall indoors,and analyzed its law of maximum field strength changing with the clearance distance.Moreover,we investigated the effect of the transformer itself structure on the maximum field strength,and calculated and compared the field distributions under some specific modeling conditions for three different types of top shielding.Simulation results demonstrate the shielding effect of dual-ring type is prior to single sphere type with the equal radiuses of ring and sphere,and the maximum value of electric field strength decreases with increase in radius of shield ring section.Combining with the space electric field distribution,a law of corona discharge caused by other auxiliary equipments and space stray items can be obtained that discharge will not happen when ground rod is more than 10 m away from the transformer and the effect on space field distribution decreases with smaller light size in the model,when the radius of light was longer than 10 cm,partial discharge will happen.Finally the layout of test transformer is optimized.
