摘要
盆式绝缘子广泛应用于高压组合电器（GIS）设备中,是实现中心导体与接地法兰间电气隔离的重要绝缘件。论文试验分析了盆式绝缘子用材料的绝缘性能,并通过电热耦合分析流程获取了盆式绝缘子的电热场分布,计算得到了最热点温度与载流量之间的关系。应用理论模型获取了盆式绝缘子的发热曲线,并用该曲线对盆子绝缘事故进行了分析。研究表明：盆子本体材料绝缘性能参数与温度具有较为显著的非线形关系;基于有限元法（FEM）的涡流场和谐波场分析方法能有效计算工频条件下中心导杆和盆子本体的发热;电场强度最大值出现在盆子与中心导体交界面处,其值为6.033 MV/m;且温度最高点位于盆子中心导体侧附近,其值为82℃;当载流量高于1.5倍额定值时,出现了温度骤然上升的热击穿现象。论文提出的电热耦合计算流程为盆式绝缘子设计方案的电热性能校核提供了途径,同时可为其现场维护及事故分析提供一定的理论指导。
Disc insulator is widely used in gas insulated station（GIS） equipment, which is an important part of the electrical isolation between central conductors and a grounding flange. We analyzed the insulation performances of materials used in the disc insulator. The heating curve of the disc insulator was obtained by using the theoretical model, and an insulation accident was analyzed using this curve. The electric and thermal field distribution of the disc insulator was obtained through the electro-thermal coupling analysis process, and the relationship between the hot-spot temperature and the current load was calculated. The research results show that the insulating properties of the spacer material have significant nonlinear relationship with temperature. The eddy current field and harmonic field analysis method by finite element method（FEM） can effectively calculate the heat of center conductors and a spacer under 50 Hz condition. The maximum electric field strength locates at the interface of center conductors and a spacer with value of 6.033 MV/m, and the hot spot is near center conductors of a spacer with value of 82 ℃. When the load is higher than 1.5 times of the rated value, the sudden rise of temperature will appear which is called thermal collapse phenomenon. Therefore, the thermal and electric field coupling calculation process provides a way to check the performance of the design scheme of the disc insulator, and can also provide a theoretical guidance for the field maintenance and accident analysis of disc insulators.
作者
张施令
张丝钰
王浩然
彭宗仁
ZHANG Shiling;ZHANG Siyu;WANG Haoran;PENG Zongren(Electric Power Research Institute,State Grid Chongqing Electric Power Company,Chongqing 401123,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi＇an Jiaotong University,Xi＇an 710049,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2018年第11期3553-3560,共8页
High Voltage Engineering
基金
重庆市基础科学与前沿技术研究(cstc2017jcyjAX0461)
重庆市电力公司科技项目(2017渝电科技5#)~~
关键词
盆式绝缘子
GIS设备
电热耦合分析
非线性
有限元法
涡流场
热击穿
disc insulator
GIS equipment
electro-thermal coupling analysis
nonlinearity
finite element method
eddyfield
thermal breakdown
