Pollution Flashover Performances of SF<sub>6</sub> Insulated DC Wall Bushing

XIE Xiongjie; LIU Qin; XU Zuoming; XU Tao; HU Wei; DENG Hongwei

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Pollution Flashover Performances of SF₆ Insulated DC Wall Bushing

更新时间：2025-12-08

- Pollution Flashover Performances of SF₆ Insulated DC Wall Bushing
- Vol. 44, Issue 6, Pages: 1806-1813(2018)
- 作者机构：
  
  1. 中国电力科学研究院有限公司电网环境保护国家重点实验室
  2. 西安交通大学电力设备电气绝缘国家重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：10 July 2018，
  
  Published：2018
- 稿件说明：
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XIE Xiongjie, LIU Qin, XU Zuoming, et al. Pollution Flashover Performances of SF₆ Insulated DC Wall Bushing[J]. 2018, 44(6): 1806-1813.
DOI：

XIE Xiongjie, LIU Qin, XU Zuoming, et al. Pollution Flashover Performances of SF₆ Insulated DC Wall Bushing[J]. 2018, 44(6): 1806-1813. DOI：

摘要

为研究不同污秽条件下直流穿墙套管的污闪特性、空心复合绝缘子不同伞形结构对直流穿墙套管污闪特性的影响规律、直流穿墙套管内部导体和屏蔽结构对其污闪特性的影响规律

利用大型人工环境气候实验室开展了±400 kV SF

气体绝缘直流穿墙套管人工污秽试验

获得了不同伞形穿墙套管和空心复合绝缘子50%污秽耐受电压与附盐密度（SDD）间的负幂指数关系式。研究表明:伞形结构为1大1小伞的空心复合绝缘子单位爬距闪络电压值要高于1大2小伞的空心复合绝缘子

有内部导体和屏蔽层的直流套管较没有内部导体和屏蔽层的直流空心复合绝缘子的U50%在SDD为0.08、0.15、0.20 mg/cm

时分别提高5.3%、4.2%、5.3%

根据研究结论建议±1 100kV SF

气体绝缘特高压直流穿墙套管外绝缘伞形结构设计可采用爬电距离利用率较高的伞形配置

且爬电比距不低于48 mm/kV。

Abstract

In order to study the pollution flashover performances of DC wall bushing under different pollution conditions

the influences of different composite umbrella structures on the flashover characteristics of DC wall bushing

and the influences of the internal conductor and shielding structure of the wall bushing on pollution flashover characteristics of composite coat

we carried out artificial pollution tests of ±400 kV SF

insulated DC wall bushing with composite insulator as its coat in the large artificial climate laboratory

and obtained the negative power index relation between the 50%withstand voltage(U

) and salt deposit density（SDD） of different composite umbrella structures of wall bushing. The research demonstrates that the fla

shover voltage value of unit creepage distance of the wall bushing composite insulator with one big/one small umbrella structure is higher than that with one big/two small umbrella structure. The results are also obtained when the SDD is 0.08

0.15

and 0.20 mg/cm

the 50% withstand voltage(U

) of the DC wall bushing with internal conductor and shielding structure is improved by 5.3%

4.2%

and 5.3% than the DC hollow composite insulator without internal conductor and shielding structure. According to the research results

we suggest that the umbrella structure with a higher utilization ratio of creepage distance can be employed in the appropriate external umbrella structure design of ±1 100 kV UHV DC wall bushing

and the creepage distance is not less than 48 mm/kV.

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AI问答

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Pollution Flashover Performances of SF6 Insulated DC Wall Bushing

DOI：

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Pollution Flashover Performances of SF₆ Insulated DC Wall Bushing