电工技术学报  2018, Vol. 33 Issue (22): 5178-5188    DOI: 10.19595/j.cnki.1000-6753.tces.180936
直流管道输电绝缘关键技术专题(Ⅱ)(特约主编:李庆民教授 马国明副教授) |
直流GIL柱式绝缘子表面电荷积聚特性
田汇冬1, 李乃一1, 2, 吴泽华1, 郭子豪1, 彭宗仁1
1. 西安交通大学电力设备与电气绝缘国家重点实验室 西安 710049;
2. 国网浙江省电力公司电力科学研究院 杭州 310014
Accumulation Characteristics of Surface Charge for Post Insulators of DC Enclosed Transmission Line
Tian Huidong1, Li Naiyi1, 2, Wu Zehua1, Guo Zihao1, Peng Zongren1
1. China State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China;
2. State Grid Zhejiang Electric Power Corporation Research Institute Hangzhou 310014 China
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摘要 直流气体绝缘输电线路(GIL)在长时间电压作用下,内部柱式支撑绝缘子表面易积聚电荷,容易导致绝缘子沿面闪络。因此,研究直流电压下绝缘子表面电荷的积聚特性,对提高直流GIL的绝缘性能和运行可靠性具有重要意义。本文以直流GIL柱式支撑绝缘子为研究对象,设计并搭建表面电荷测量实验平台,引入弱电离气体的迁移扩散方程,利用多物理场有限元分析软件,建立绝缘子-气体复合绝缘结构的表面电荷积聚模型,测量并仿真简化的柱式绝缘子的表面电荷积聚情况,并结合实验和仿真计算结果分析表面电荷积聚成因。同时,建立±800kV直流GIL模型,分析绝缘子的表面电导率、体积电导率和气体的气体电离率对气固界面电场强度和表面电荷积聚的影响。研究深化了直流电压作用下对气-固绝缘界面电荷积聚机理的认识,为直流GIL设备中固体绝缘件的结构设计提供了方法和依据。
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田汇冬
李乃一
吴泽华
郭子豪
彭宗仁
关键词 表面电荷直流电压电荷积聚柱式绝缘子电场分布    
Abstract:Post insulators within DC GIL tend to accumulate surface charge under long-term DC voltage, which easily leads to insulator flashover. Thus, it is important to study the surface charge accumulation characteristics under DC voltage in order to improve the operational reliability of DC GIL. Focusing on the post insulator in GIL, this paper researched its surface charge accumulation characteristics. An experiment platform for surface charge measurement was designed. Through the migration and diffusion equation of weakly ionized gas, the surface charge accumulation model was established by FEM. The surface charges were measured and simulated under the constant temperature condition. The dynamic processes of charge accumulation were analyzed. Meanwhile, the simulation model of ±800kV DC GIL was built, and the impacts of the surface conductivity, bulk conductivity and gas ionization rate on the electrical field distribution and surface charge accumulation of post insulator were analyzed. The conclusions deepened the understanding of the charge accumulation mechanism on gas-solid insulation interface under DC voltage, which can provide the methods and references for solid insulation structure design in DC GIL equipment.
Key wordsSurface charge    DC voltage    charge accumulation    post insulator    electrical field distribution   
收稿日期: 2018-05-31      出版日期: 2018-11-27
PACS: TM216  
基金资助:陕西省2018年重点研发计划(2018ZDCXL-GY-07-03)资助项目
通讯作者: 田汇冬 男,1994年生,博士研究生,研究方向为绝缘结构设计。E-mail: thd8088275@stu.xjtu.edu.cn   
作者简介: 李乃一 男,1988年生,博士,研究方向为绝缘结构设计。Email: 53642551@qq.com
引用本文:   
田汇冬, 李乃一, 吴泽华, 郭子豪, 彭宗仁. 直流GIL柱式绝缘子表面电荷积聚特性[J]. 电工技术学报, 2018, 33(22): 5178-5188. Tian Huidong, Li Naiyi, Wu Zehua, Guo Zihao, Peng Zongren. Accumulation Characteristics of Surface Charge for Post Insulators of DC Enclosed Transmission Line. Transactions of China Electrotechnical Society, 2018, 33(22): 5178-5188.
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