特高压交流试验示范工程主变保护误动作分析  

Analysis on the Primary Transformer Protection Misoperation in UHV Pilot Project

作　　者：田庆 

机构地区：[1]南方电网超高压输电公司检修试验中心,广州510663

出　　处：《高压电器》2011年第2期7-11,共5页High Voltage Apparatus

摘　　要：笔者分析了特高压交流试验示范工程系统调试过程中出现的荆门站1 000 kV 1号主变压器空充跳闸事件。根据调压补偿变励磁涌流的特点,结合1 000 kV 1号主变压器调压补偿变保护二次谐波制动和波形分析制动的原理,重点分析了1 000 kV 1号主变压器调压补偿变第1套保护装置SGT756和第2套保护装置RCS978C动作的原因。综合考虑调压补偿变差动保护的可靠性和安全性,针对当前荆门站站内设备的运行情况,提出相应的改进措施:改变直阻试验方法、增加去磁试验、改进保护原理。The protection misoperation of 1 000 kV No.1 transformer in Jingmen Station was studied in this paper when transformer is charged during the system debug of UHV Pilot Project.The principle of second harmonic current restrained and wave symmetry restrained for regulating transformer differential protection was given according to the inrush current characteristic of regulating transformer.The reasons of the misoperation in SGT756 protection equipment and RCS978C protection equipment were analyzed separately.Three corresponding methods,changing the method of direct resistance test method,adding the erasing magnetism test and improving the protection principle,were put forward by the equipments operation situation in Jingmen station.When these methods were utilized in future China UHV project,the transformer protection reliability can be revised.

关 键 词：特高压交流试验示范工程 励磁涌流 波形对称 调压变 补偿变 误动作 

分 类 号：TM772[电气工程—电力系统及自动化]