Operating Characteristic of HVDC Wall Bushings Used in CSG

Xiaoxing Wei, Jinyin Zhang, Jinwei Chu, Gulin Xia, Wenhao Lu, Yumeng Zeng
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Abstract

As a connecting device between DC field and valve hall of converter station, the DC wall bushing is in the“throat” position in HVDC project. Since the first 500kV DC wall bushing was put into operation in 1999, more than 88 DC wall bushings have been operated in CSG system. Long-term operating experience has shown that the main problems in the operation of DC wall bushings concentrated on mechanical failure, current-carrying structure and external insulation. In this paper, the structure and material of Resin Impregnated Paper bushing was described in detail first, and then the typical weakness during the electrical and mechanical design, such as internal discharge, overheating, mechanical damage and aging of silicone rubber, were analyzed respectively. More importantly, specific solutions for these damage were also put forward. The purpose of this paper is to sort out the design and structure of the DC wall bushing in operation of CSG, summarize and analyze the problems in the operation of the wall bushing, and then propose guidance and suggestions for the design, manufacture, operation and maintenance of the DC wall bushing.
CSG用高压直流墙衬套的工作特性
直流墙衬套作为直流场与换流站阀厅之间的连接装置,在高压直流工程中处于“咽喉”位置。自1999年首套500kV直流壁套投入运行以来,CSG系统共运行了88套直流壁套。长期运行经验表明,直流墙衬套运行中存在的主要问题集中在机械故障、载流结构和外绝缘三个方面。本文首先详细介绍了树脂浸渍纸衬套的结构和材料,然后分别分析了硅橡胶在电气和机械设计中的典型弱点,如内部放电、过热、机械损伤和老化。更重要的是,对这些损害提出了具体的解决方案。本文的目的是对CSG运行中直流墙衬套的设计和结构进行梳理,对墙衬套运行中存在的问题进行总结和分析,进而对直流墙衬套的设计、制造、运行和维护提出指导和建议。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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