高压SF_6电流互感器三维电场数值计算与优化设计
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摘要
SF_6气体绝缘电流互感器由于绝缘气体本身特性,其内部电场分布的均匀程度和电场强度分布必须严格控制,以保证其高绝缘特性。而电场计算是SF_6气体绝缘电流互感器绝缘分析的重要手段。高压SF_6电流互感器总体结构为“T”型结构,一次导体和二次绕组构成“T”型结构顶端的同轴圆柱体,而二次引线经过低电位的引线屏蔽管引至下部的底座,构成“T”型结构下部。为改善壳体与引线管间电场分布,在瓷套与壳体连接处瓷套内部加装屏蔽罩,该屏蔽罩与二次引线管间近似构成同轴圆柱电场。两同轴圆柱电场相贯而形成复杂三维电场,其中二次绕组与其引线屏蔽管垂直正交。
电流互感器场域结构复杂,为进行绝缘分析与结构设计,本文以220kV SF_6电流互感器实际产品结构为研究对象,采用有限元数值求解方法,建立了复杂结构含SF_6、绝缘瓷套、空气等多重介质的三维电场数学模型,采用区域分解和自适应剖分技术相结合的手段,对三维电场进行了仿真求解,得到了复杂结构中三维场域电场分布,找到了电流互感器内部最大场强所在位置以及绝缘薄弱点。
为提高SF_6电流互感器全场域电场的均匀度,避免电晕放电等击穿现象的发生,绝缘设计中对法兰盘附近加设屏蔽环以及在一次导体端部加设屏蔽环两种方案的电场进行了分析及优化。并将电流互感器各结构部件沿面电场分布以及全场域电场分布进行了对比分析,研究了屏蔽环对改善电场的作用,比较了不同优化条件下的电场分布,给出了屏蔽环最佳位置及结构尺寸,为电流互感器绝缘结构设计提供了数值基础。
In order to ensure the insulation performance of the SF6 current transformer,the uniformity degree and the distribution of electric field strength must be precisely controlled. And the numerical computation of electric field is a key method to perform the insulation analysis of high voltage SF6 current transformer.The structure of high voltage SF6 current transformer is a typical "T" type structure.And its primary conductor and secondary winding composes a coaxial cylinder of"T" type structure and the secondary coil with low voltage composes the other part of"T" type structure.In order to improve the electric field distribution of the whole structure,the shielding cover and rings are mounted near the terminal part of the primary coil.
The shielding cover and secondary down-lead pipe approximately form a coaxial column electric field.The complex 3D electric filed is formed due to the above two coaxial cylindrical electric field,and the secondary winding and down-lead shield pipe are orthogonally intersected hereinto.
The field of current transformer is a complexity structure.In order to perform the insulation analysis and structure design,220kV SF6 current transformer is adopted as the research object,and the FEM is adopted to establish the 3D electric field mathematical model including multiple media,such as,SF_6 gas,insulation porcelain and air. Combination of domain division analysis and self-adapt mesh technology are adopted to simulate and compute to 3D electric field.Moreover,the distribution of 3D electric field is obtained,and the location of maximum electric field strength and insulation weakness area is found.
In order to improve the whole electric field evenness degree of SF_6 current transformer,and avoid the corona discharge breakdown phenomenon,two methods of adding shielding ring near the flange and primary conductor are adopted to analyze and optimize the electric field.The electric field distribution of every part surface of current transformer and the whole electric field distribution are contrastingly analyzed.The effect of improved electric field is researched,and the electric field distribution under different optimization condition is compared.And the optimal position and structure dimension of shielding ring is designed.Furthermore,the numerical foundation of current transformer insulation structure design is established.
电流互感器场域结构复杂,为进行绝缘分析与结构设计,本文以220kV SF_6电流互感器实际产品结构为研究对象,采用有限元数值求解方法,建立了复杂结构含SF_6、绝缘瓷套、空气等多重介质的三维电场数学模型,采用区域分解和自适应剖分技术相结合的手段,对三维电场进行了仿真求解,得到了复杂结构中三维场域电场分布,找到了电流互感器内部最大场强所在位置以及绝缘薄弱点。
为提高SF_6电流互感器全场域电场的均匀度,避免电晕放电等击穿现象的发生,绝缘设计中对法兰盘附近加设屏蔽环以及在一次导体端部加设屏蔽环两种方案的电场进行了分析及优化。并将电流互感器各结构部件沿面电场分布以及全场域电场分布进行了对比分析,研究了屏蔽环对改善电场的作用,比较了不同优化条件下的电场分布,给出了屏蔽环最佳位置及结构尺寸,为电流互感器绝缘结构设计提供了数值基础。
In order to ensure the insulation performance of the SF6 current transformer,the uniformity degree and the distribution of electric field strength must be precisely controlled. And the numerical computation of electric field is a key method to perform the insulation analysis of high voltage SF6 current transformer.The structure of high voltage SF6 current transformer is a typical "T" type structure.And its primary conductor and secondary winding composes a coaxial cylinder of"T" type structure and the secondary coil with low voltage composes the other part of"T" type structure.In order to improve the electric field distribution of the whole structure,the shielding cover and rings are mounted near the terminal part of the primary coil.
The shielding cover and secondary down-lead pipe approximately form a coaxial column electric field.The complex 3D electric filed is formed due to the above two coaxial cylindrical electric field,and the secondary winding and down-lead shield pipe are orthogonally intersected hereinto.
The field of current transformer is a complexity structure.In order to perform the insulation analysis and structure design,220kV SF6 current transformer is adopted as the research object,and the FEM is adopted to establish the 3D electric field mathematical model including multiple media,such as,SF_6 gas,insulation porcelain and air. Combination of domain division analysis and self-adapt mesh technology are adopted to simulate and compute to 3D electric field.Moreover,the distribution of 3D electric field is obtained,and the location of maximum electric field strength and insulation weakness area is found.
In order to improve the whole electric field evenness degree of SF_6 current transformer,and avoid the corona discharge breakdown phenomenon,two methods of adding shielding ring near the flange and primary conductor are adopted to analyze and optimize the electric field.The electric field distribution of every part surface of current transformer and the whole electric field distribution are contrastingly analyzed.The effect of improved electric field is researched,and the electric field distribution under different optimization condition is compared.And the optimal position and structure dimension of shielding ring is designed.Furthermore,the numerical foundation of current transformer insulation structure design is established.
引文
[1]罗青林,刘玉风.330kVSF_6电流互感器电场计算及绝缘结构分析.变压器,2001,38(4):4-6.
[2]中国机械工业年鉴编辑委员会,中国电力工业协会主编.2005中国电器行业工业年鉴,2005.11:1-4.
[3]唐绍予.浅析高压SF_6电流互感器的结构与工艺.变压器,2001,38(3):13-16.
[4]Park K Y,GUO X J,Fang M T C.Mathematical Modeling of SF6 Puffer Circuit Breakers Ⅱ:Current Zero Region IEEE Transactions on Plasma Science.1997,25(5):967-973.
[5]曹庆文,董连文,蔺跃宏,等.有限元分析软件ANSYS在电容式电压互感器电场分析中的应用.高压电器,2003,39(5):35-37.
[6]刘玉风,罗青林.SF_6气体绝缘电流互感器电容锥设计及外绝缘电场计算.变压器,2000,37(10):10-13.
[7]Niemeyer Legal.The mechanism of leader breakdown in electronegative gases.IEEE Transom EI,24,1989:309-324.
[8]Divinized M,Tumma L R,Richter Betel.Multiples lightning currents and metal oxide arresters.IEEE Trans PD,1997,12(3):11-68.
[9]李建基.国际大电网会议与高压开关设备技术.上海电器技术,2001:10-11.
[10]冯慈璋.电磁场.北京高等教育出版社,1983:24-45.
[11]钟思正.外界磁场对电流互感器工作的影响.高压电器,2004,40(2):148-150.
[12]Churners I Detail.The development of electrical leader discharges in a point/plane gap in SF6.ProcRSoc,1987,A412:285-308.
[13]Hebert J L,Hebert M P,Walko L C.Pulsed power applications in aircraft lightning qualification testing.Sixth IEEE pulsed power conference,1987:326-340.
[14]杨育京,郭天兴,刘亚.SF_6气体绝缘电流互感器的研制.电力电容器,2003,增刊:14-16.
[15]朱德恒,严璋.高电压绝缘.北京:清华大学出版社,1992:323-324.
[16]Kopf.E,Abdulla Mc.High-Voltage Engineer.Oxford:PERGAMON Press ltd,1977:24.
[17]凌子恕.高压互感器技术手册.中国电力出版社,2005:1-18.
[18]黎斌.内绝缘为SF_6气体的高压电流互感器.高压电器技术,1998.1:3-8.
[19]黎斌.SF_6电器设计.北京:机械工业出版社,2003:1-20.
[20]黎斌,张希捷,于智伟.220kV高压SF_6电流互感器的开发.高压电器技术,1995,12:3-8、24.
[21]张萍.SF_6电流互感器的特点及应用.山西电力技术,1996,3:14.
[22]Zienkiewiez,O.C.The Finite Element Method,3ed.New York,McGraw-Hill,1977:5-7.
[23]王世山,李彦明,佟威,等.SF_6电流互感器电场计算及其结构优化.电瓷避雷器,2003,4:22-24,27.
[24]Park K Y,Fang M T C.Mathematical Modeling of SF6 Puffer Circuit Breakers I:High Current Region IEEE Transactions on Plasma Science.1996,24(5):380-401.
[25]王世山,王德林,李彦明.大型有限元软件ANSYS在电磁领域的使用.高压电器,2002,38(3):4-10.
[26]刘涛,杨凤鹏.精通ANSYS.北京:清华大学出版社,2002:23-89.
[27]#12
[28]李黎明.ANSYS有限元分析实用教程.北京:清华大学出版社,2005,1:1-50.
[29]关志根.高电压工程基础.中国电力出版社,2003.3:102-111.
[30]袁季修,盛和乐,吴聚业.保护用电流互感器应用指南.中国电力出版社,2004:5-9.
[31]李建基。高压开关设备实用技术.中国电力出版社,2005:5-7.
[32]Zhang J L,Yan J D,and Fang M T C.Electrode Evaporation and Its Effects on Thermal Arc Behavior.IEEE Transactions on Plasma Science.2004,32(3):1245-1249.
[33]Segrlind,L.Applied Finite Element Analysis,2nd.New York,John Wiley and Sons,1984:64-65.
[34]黄国权.有限元法基础及ANSYS应用.北京:机械工业出版社,2004,6:7.
[35]Arthur Wright.Current Transformers-Their Transient and Steady State Performance Chapman and Hall,1955:7-11.
[36]Schade E,Ragaller K.Dielectric Recovery of an Axially Blown SF_6 Arc after Current Zero.Part 1Experimental Investigation.IEEE Transactions on Plasma Science,1982,10(3):141-147.
[37]王国强.实用工程数值模拟技术及其在ANSYS上的实践.西安:西安工业大学出版社,2000,10(3):236-240.
[38]博弈创作室编著.APDL参数化有限元分析技术及其应用实例.北京:中国水利水电出版社,2004,3:1-50.
[39]Liu Xiaoming,Wen Fuyue Cao Yundong.et al.Multivariable optimal design of vacuum interrupter using novel sele-adaptive genetic algorithm.Proceedings of the ⅩⅩ Ⅱ nd International Symposium on Discharge and Electrical Insulation in Vacuum,2006:2-8.
[40]周侗.500kV瓷柱式双断口SF_6断路器的三维电场分析.高压电器,1999,(2)39:17-20.
[2]中国机械工业年鉴编辑委员会,中国电力工业协会主编.2005中国电器行业工业年鉴,2005.11:1-4.
[3]唐绍予.浅析高压SF_6电流互感器的结构与工艺.变压器,2001,38(3):13-16.
[4]Park K Y,GUO X J,Fang M T C.Mathematical Modeling of SF6 Puffer Circuit Breakers Ⅱ:Current Zero Region IEEE Transactions on Plasma Science.1997,25(5):967-973.
[5]曹庆文,董连文,蔺跃宏,等.有限元分析软件ANSYS在电容式电压互感器电场分析中的应用.高压电器,2003,39(5):35-37.
[6]刘玉风,罗青林.SF_6气体绝缘电流互感器电容锥设计及外绝缘电场计算.变压器,2000,37(10):10-13.
[7]Niemeyer Legal.The mechanism of leader breakdown in electronegative gases.IEEE Transom EI,24,1989:309-324.
[8]Divinized M,Tumma L R,Richter Betel.Multiples lightning currents and metal oxide arresters.IEEE Trans PD,1997,12(3):11-68.
[9]李建基.国际大电网会议与高压开关设备技术.上海电器技术,2001:10-11.
[10]冯慈璋.电磁场.北京高等教育出版社,1983:24-45.
[11]钟思正.外界磁场对电流互感器工作的影响.高压电器,2004,40(2):148-150.
[12]Churners I Detail.The development of electrical leader discharges in a point/plane gap in SF6.ProcRSoc,1987,A412:285-308.
[13]Hebert J L,Hebert M P,Walko L C.Pulsed power applications in aircraft lightning qualification testing.Sixth IEEE pulsed power conference,1987:326-340.
[14]杨育京,郭天兴,刘亚.SF_6气体绝缘电流互感器的研制.电力电容器,2003,增刊:14-16.
[15]朱德恒,严璋.高电压绝缘.北京:清华大学出版社,1992:323-324.
[16]Kopf.E,Abdulla Mc.High-Voltage Engineer.Oxford:PERGAMON Press ltd,1977:24.
[17]凌子恕.高压互感器技术手册.中国电力出版社,2005:1-18.
[18]黎斌.内绝缘为SF_6气体的高压电流互感器.高压电器技术,1998.1:3-8.
[19]黎斌.SF_6电器设计.北京:机械工业出版社,2003:1-20.
[20]黎斌,张希捷,于智伟.220kV高压SF_6电流互感器的开发.高压电器技术,1995,12:3-8、24.
[21]张萍.SF_6电流互感器的特点及应用.山西电力技术,1996,3:14.
[22]Zienkiewiez,O.C.The Finite Element Method,3ed.New York,McGraw-Hill,1977:5-7.
[23]王世山,李彦明,佟威,等.SF_6电流互感器电场计算及其结构优化.电瓷避雷器,2003,4:22-24,27.
[24]Park K Y,Fang M T C.Mathematical Modeling of SF6 Puffer Circuit Breakers I:High Current Region IEEE Transactions on Plasma Science.1996,24(5):380-401.
[25]王世山,王德林,李彦明.大型有限元软件ANSYS在电磁领域的使用.高压电器,2002,38(3):4-10.
[26]刘涛,杨凤鹏.精通ANSYS.北京:清华大学出版社,2002:23-89.
[27]#12
[28]李黎明.ANSYS有限元分析实用教程.北京:清华大学出版社,2005,1:1-50.
[29]关志根.高电压工程基础.中国电力出版社,2003.3:102-111.
[30]袁季修,盛和乐,吴聚业.保护用电流互感器应用指南.中国电力出版社,2004:5-9.
[31]李建基。高压开关设备实用技术.中国电力出版社,2005:5-7.
[32]Zhang J L,Yan J D,and Fang M T C.Electrode Evaporation and Its Effects on Thermal Arc Behavior.IEEE Transactions on Plasma Science.2004,32(3):1245-1249.
[33]Segrlind,L.Applied Finite Element Analysis,2nd.New York,John Wiley and Sons,1984:64-65.
[34]黄国权.有限元法基础及ANSYS应用.北京:机械工业出版社,2004,6:7.
[35]Arthur Wright.Current Transformers-Their Transient and Steady State Performance Chapman and Hall,1955:7-11.
[36]Schade E,Ragaller K.Dielectric Recovery of an Axially Blown SF_6 Arc after Current Zero.Part 1Experimental Investigation.IEEE Transactions on Plasma Science,1982,10(3):141-147.
[37]王国强.实用工程数值模拟技术及其在ANSYS上的实践.西安:西安工业大学出版社,2000,10(3):236-240.
[38]博弈创作室编著.APDL参数化有限元分析技术及其应用实例.北京:中国水利水电出版社,2004,3:1-50.
[39]Liu Xiaoming,Wen Fuyue Cao Yundong.et al.Multivariable optimal design of vacuum interrupter using novel sele-adaptive genetic algorithm.Proceedings of the ⅩⅩ Ⅱ nd International Symposium on Discharge and Electrical Insulation in Vacuum,2006:2-8.
[40]周侗.500kV瓷柱式双断口SF_6断路器的三维电场分析.高压电器,1999,(2)39:17-20.