电力系统保护与控制2017，Vol.45Issue(21)：123-133,11.DOI:10.7667/PSPC161893
不同故障下特高压换流变压器差动保护动作特性分析
Research on the characteristics of ultra-high voltage converter transformer differential protection under the internal and external faults
摘要
Abstract
Converter transformer is the most important equipment in HVDC system, and its differential protection plays a significant role to guarantee the safety operation of HVDC system. At present, the second harmonic restraint method is usually adopted in converter transformer differential protection for blocking inrush currents. The converter adopted in ultra HVDC system is non-linear component, which results in differences between protective performance of the converter transformer and the common power transformer. This paper makes detailed analysis on the different fault characteristic of the converter transformer by constructing relevant short circuit current flow path, which includes the internal single phase to ground fault, internal phase to phase fault, and the valve fault in rectifier. The research results show that the differential protection of converter transformer will not mal-operate during an external fault, but it may refuse to operate when internal faults.关键词
特高压直流输电/换流变压器/换流器/差动保护Key words
ultra-high voltage direct current transmission/converter transformer/converter/differential protection引用本文复制引用
林磊,陈川,胡鑫,郑涛..不同故障下特高压换流变压器差动保护动作特性分析[J].电力系统保护与控制,2017,45(21):123-133,11.基金项目
This work is supported by Key Project of Smart Grid Technology and Equipment of National Key Research and Development Program of China (No.2016YFB0900600).国家重点研发计划智能电网技术与装备重点专项(2016YFB0900600) （No.2016YFB0900600）
