安装线路避雷器是一种有效的线路防雷手段,但目前带间隙和不带间隙的氧化锌避雷器都存在各自的缺点,且安装维护难度大。为此提出了一种穿心结构带环形电阻片的氧化锌避雷器,并与带均压环的绝缘子串联,形成一种新型500 k V防雷防冰闪复...安装线路避雷器是一种有效的线路防雷手段,但目前带间隙和不带间隙的氧化锌避雷器都存在各自的缺点,且安装维护难度大。为此提出了一种穿心结构带环形电阻片的氧化锌避雷器,并与带均压环的绝缘子串联,形成一种新型500 k V防雷防冰闪复合绝缘子。提出了总长度<5 m的绝缘子结构参数并进行了绝缘配合与电场仿真分析,仿真结果表明:正常工况下绝缘子表面电场最大场强为300 k V/m;在覆冰厚度为10 mm且冰凌长度达10 cm时,绝缘子表面最大场强为350 k V/m,均小于空气起晕与击穿场强。对500 k V防冰防雷绝缘子进行了工频湿耐受,操作冲击耐受与雷电冲击闪络试验,试验结果验证了防雷防冰闪绝缘子的有效性,为重冰多雷区域的输电线路保护提供了参考。展开更多
Modeling the steady thermal field of the column-type air-core reactor,and further analyzing its distribution regularity,will help optimizing reactor design as well as improving its quality.The operation mechanism and ...Modeling the steady thermal field of the column-type air-core reactor,and further analyzing its distribution regularity,will help optimizing reactor design as well as improving its quality.The operation mechanism and inner insulation structure of a novel current limiting column-type air-core reactor is introduced in this paper.The finite element model of five encapsulation forced air-cooled column-type air-core reactor is constructed using Fluent.Most importantly,this paper present a new method that,the steady thermal field of reactor working under forced air-cooled condition is simulated without arbitrarily defining the convection heat transfer coefficient for the initial condition;The result of the thermal field distribution shows that,the maximum steady temperature rise of forced air-cooled column-type air-core reactor happens approximately 5% to its top.The law of temperature distribution indicates: In the 1/3 part of the reactor to its bottom,the temperature will rise rapidly to the increasing of height,yet the gradient rate is gradually decreasing;In the 5% part of the reactor to its top,the temperature will drop rapidly to the increasing of height;In the part between,the temperature will rise slowly to the increasing of height.The conclusion draws that more thermal withstand capacity should be considered at the 5% part of the reactor to its top to achieve optimal design solution.展开更多
文摘安装线路避雷器是一种有效的线路防雷手段,但目前带间隙和不带间隙的氧化锌避雷器都存在各自的缺点,且安装维护难度大。为此提出了一种穿心结构带环形电阻片的氧化锌避雷器,并与带均压环的绝缘子串联,形成一种新型500 k V防雷防冰闪复合绝缘子。提出了总长度<5 m的绝缘子结构参数并进行了绝缘配合与电场仿真分析,仿真结果表明:正常工况下绝缘子表面电场最大场强为300 k V/m;在覆冰厚度为10 mm且冰凌长度达10 cm时,绝缘子表面最大场强为350 k V/m,均小于空气起晕与击穿场强。对500 k V防冰防雷绝缘子进行了工频湿耐受,操作冲击耐受与雷电冲击闪络试验,试验结果验证了防雷防冰闪绝缘子的有效性,为重冰多雷区域的输电线路保护提供了参考。
基金Project supported by National Science and Technology Support Project(2009BAA19B04)
文摘Modeling the steady thermal field of the column-type air-core reactor,and further analyzing its distribution regularity,will help optimizing reactor design as well as improving its quality.The operation mechanism and inner insulation structure of a novel current limiting column-type air-core reactor is introduced in this paper.The finite element model of five encapsulation forced air-cooled column-type air-core reactor is constructed using Fluent.Most importantly,this paper present a new method that,the steady thermal field of reactor working under forced air-cooled condition is simulated without arbitrarily defining the convection heat transfer coefficient for the initial condition;The result of the thermal field distribution shows that,the maximum steady temperature rise of forced air-cooled column-type air-core reactor happens approximately 5% to its top.The law of temperature distribution indicates: In the 1/3 part of the reactor to its bottom,the temperature will rise rapidly to the increasing of height,yet the gradient rate is gradually decreasing;In the 5% part of the reactor to its top,the temperature will drop rapidly to the increasing of height;In the part between,the temperature will rise slowly to the increasing of height.The conclusion draws that more thermal withstand capacity should be considered at the 5% part of the reactor to its top to achieve optimal design solution.
