±800kV特高压直流换流站最高端换流变阀侧避雷器保护研究  

Arrester Protection at Valve-side of Highest Potential Converter Transformer in ±800 kV UHVDC Project

作　　者：周晓琴[1] 苟锐锋[1] 吕金壮 李宾宾[1] 王从钢[1] 

机构地区：[1]西安高压电器研究所,陕西西安710077 [2]南方电网技术研究中心,广东广州510623

出　　处：《高压电器》2009年第2期1-3,6,共4页High Voltage Apparatus

摘　　要：±800 kV直流输电工程与常规±500 kV直流输电工程换流站的避雷器保护方案存在一些不同点,在±800 kV直流输电工程换流站增加避雷器以进一步限制换流站内关键点的过电压水平就是不同点之一,其中包括在最高电位换流变阀侧增加避雷器(A2)对高压阀侧设备进行保护。笔者针对±800 kV特高压直流实际工程,重点分析研究了安装A2避雷器的必要性。选取典型工况在换流站高压端换流变阀侧有避雷器直接保护和无避雷器直接保护的两种方案下计算换流站相关点的过电压水平。结果表明,高压端换流变阀侧加装A2避雷器可直接保护高压端换流变阀侧,有效降低阀侧设备的绝缘水平,从而降低特高压直流工程换流变压器、高压套管等设备的制造成本和难度,因此是非常直接而可靠的保护方案。The arrangement scheme of surge,arresters for ±800 kV UHVDC transmission line converter station is different from the one for ±500 kV HVDC transmission line converter station. For example, additional arresters are adopted in ±800 kV UHVDC converter station to further limit over-voltage at several special locations, including an A2 arrester which is set on the highest potential converter transformer side to protect the equipment at valve-side. Focusing on Yunnan-Guangdong ＋800 kV UHVDC project, this paper analyzes the necessity of A2 arrester. Typical fault cases with and without A2 arrester at the valve-side of the converter station are chosen to calculate the over-voltage at relevant positions, respectively. The results show that the scheme with A2 arrester can protect directly the valve-side of the converter transformer at highest potential, and reduces the insulation level of valve-side equipment effectively, which results in lower production cost and manufacture difficulty of UHVDC converter transformers, high voltage bushings, etc.

关 键 词：特高压直流 避雷器配置 阀侧保护 A2避雷器 保护水平 

分 类 号：TM862[电气工程—高电压与绝缘技术]