制动电流对变压器差动保护起动电流校验的影响  

Effect of braking current on starting current calibration of transformer differential protection

作　　者：倪继文 杨世强 张钢 张文斌[1] 刘冲 NI Jiwen;YANG Shiqiang;ZHANG Gang;ZHANG Wenbin;LIU Chong(Thermal Power Research Institute of Xi'an,Xi'an 710032,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710032

出　　处：《电气应用》2021年第1期79-82,共4页Electrotechnical Application

摘　　要：在变压器差动保护起动电流校验过程中,通过在变压器一侧加入起动电流的方法忽略了制动电流的影响,不能准确反映保护的动作特性。通过分析差动保护的动作原理,根据差动保护的动作方程可推导出起动电流校验时变压器高低压侧的实际电流,从而避免了制动电流的影响,提高了起动电流的校验准确度。In the starting current calibration process of the transformer differential protection, the influence of braking current is neglected by adding starting current to one side of the transformert, which can not accurately response the operation characteristics of the protection. By analyzing the operation principle of the differential protection, the actual current on the high and low voltage side of the transformer can be deduced based on the operation equation of the differential protection, so as to avoid the infuence of the braking current and improve the calibration precision of the starting current.

关 键 词：变压器差动保护 起动电流 制动电流 校验准确度 

分 类 号：TM774[电气工程—电力系统及自动化]