电测与仪表2025，Vol.62Issue(5)：58-67,10.DOI:10.19753/j.issn1001-1390.2025.05.007
适用于空载合闸于匝间故障的特高压换流变压器保护新方法
A new protection method for UHV converter transformers suitable for no-load closing andinter-turn faults
摘要
Abstract
The ultral high voltage direct current(UHVDC)transmission system has a high voltage level and is a mixed AC and DC connection,which makes the coupling relationship between them more closely,so that the con-verter transformer has different characteristics from ordinary transformers in the case of excitation inrush current and internal faults,which causes traditional protections cannot be well identified.In this paper,according to the Spearman coefficient and the time coefficient of absolute value of zero-sequence current,a new method for identif-ying excitation inrush current of UHV converter transformer is proposed.This method first calculates the Spearman coefficient of the absolute value waveforms of the excitation inrush current and the internal fault in the front and back half-week waves.In view of the waveform characteristics of no-load closing with inrush current characteristics under inter-fault,the time coefficient of the absolute value of the zero-sequence current on the grid side is used as the auxiliary criterion.Through PSCAD/EMTDC software simulation,it is proved that the method proposed in this paper can effectively distinguish the excitation inrush current from the internal fault,and can effectively avoid the protection fault braking caused by the no-load closing on the inter-turn fault.Thus,the safety of converter trans-former system can get obvious improvement.关键词
励磁涌流/内部故障/空载合闸于匝间故障/斯皮尔曼系数/零序电流绝对值时间系数Key words
excitation inrush current/internal fault/no-load closing to inter-turn fault/Spearman coefficient/zero-sequence current absolute value time coefficient分类
动力与电气工程引用本文复制引用
金恩淑,吴宛凝,张弼弘,朱宏,耿梦炜..适用于空载合闸于匝间故障的特高压换流变压器保护新方法[J].电测与仪表,2025,62(5):58-67,10.基金项目
国家重点研发计划智能电网技术与装备重点专项(2016YFB0900600) （2016YFB0900600）
