摘要
为了分析天然酯绝缘油对电力变压器绝缘性能的影响,首先分别对相同绝缘结构的110 kV天然酯绝缘油与矿物绝缘油电力变压器进行绕组波过程计算,得到两种变压器的纵绝缘裕度。然后分别以工频下线性分布的绕组电位和波过程计算出的非线性绕组电位为激励,对两种绝缘油变压器主绝缘的复合电场进行仿真计算,并对其分布特性进行对比分析。最后运用全域电力线扫描法计算了两种绝缘油变压器的主绝缘裕度,并针对天然酯绝缘油变压器主绝缘强度薄弱的问题进行了结构改进与效果分析。结果表明:通过增设绝缘纸筒及调整油隙尺寸,改进后的天然酯绝缘油变压器最小绝缘裕度提高了15.8%,满足了主绝缘强度要求,为开发大型天然酯绝缘油变压器及结构优化提供了参考依据。
In order to analyze the influence of natural ester insulating oil on the insulating properties of power transformers,at first, the winding wave processes of a 110 kV natural ester insulating oil and a mineral insulating oil power transformers with the same insulation structure were calculated, and the longitudinal insulation margins of the two transformers were obtained. And then, the winding potential with linear distribution under power frequency and the nonlinear winding potential calculated by wave process were used as excitation sources respectively, the composite electric field of the two insulating oil transformers main insulation were simulated, and their distribution characteristics were compared and analyzed. At last, the main insulation margins of the two insulating oil transformers were calculated by using the whole-region electric flux line scanning method, and in view of the weak main insulation strength of natural ester insulating oil transformer, the structure was improved and the improvement effect was analyzed. The results show that through adding insulation paper boards and adjusting the size of oil ducts, the minimum insulation margin of the improved natural ester insulating oil transformer increases by 15.8%, which meets the requirements of main insulation strength, which provides a reference for developing large natural ester insulating oil transformer and optimizing its structure.
作者
王建民
于东旭
王浩名
杜振斌
刘兰荣
刘东升
WANG Jianmin;YU Dongxu;WANG Haoming;DU Zhenbin;LIU Lanrong;LIU Dongsheng(State Key Laboratory of Reliability and Intelligence of Electrical Equipment,Hebei University of Technology,Tianjin 300130,China;Key Laboratory of Electro-magnetic Field and Electrical Apparatus Reliability of Hebei Province,Hebei University of Technology,Tianjin 300130,China;Hebei Province Key Laboratory of Electromagnetic and Structural Performance of Power Transmission and Transformation Equipment,Baoding Tianwei Baobian Electric Co.,Ltd.,Baoding 071056,China;Department of Power Engineering,North China Electric Power University,Baoding 071003,China)
出处
《绝缘材料》
CAS
北大核心
2023年第1期62-69,共8页
Insulating Materials
基金
河北省重点研发计划项目(V1586309661297)。
关键词
天然酯绝缘油
电力变压器
波过程
主纵绝缘强度
结构优化
natural ester insulating oil
power transformer
wave process
main and longitudinal insulation strength
structure optimization
