变压器比率差动保护原理及校验方法  

Differential protection principles of transformer of ratio braking style and its measuring method

作　　者：丁泠允 胡晶晶[2] 

机构地区：[1]扬州供电公司继保班,江苏扬州225002 [2]重庆大学高电压与电工新技术教育部重点实验室,重庆400044

出　　处：《继电器》2007年第12期67-70,共4页Relay

摘　　要：在Y/Y/△变压器微机保护现场调试过程中,由于保护人员对变压器差动保护原理及保护装置补偿原理的理解存在偏差,比率差动曲线的验证往往成为调试的难点。针对这一问题,本文深入浅出地分析了变压器微机差动保护原理并总结了变压器微机保护装置普遍采用的两类差动电流补偿方法。在此基础上,理论联系实际,以Y0/Y0/△-11型三绕组变压器和南瑞RCS978变压器保护为例详细地介绍了校验步骤,提出了一套验证变压器微机保护比率差动曲线及拐点的思路及方法。In tests of numerical transformer＇s differential protection , it is difficult to validate the curve of ratio-differential protection because technicians always misunderstand the principal of numerical transformer＇s differential protection and the methods of differential current compensation of different relaying apparatus . Aiming at this problem , this paper analyses the principal mentioned above in detail and classifies the compensation-methods adopted widely into two types. Based on which, the paper uses the Y0/Y0//△-11 three-winding transformer and one of the transformer＇s differential protective relaying apparatus-NARI＇s RCS978 sets as an example to illustrate the testing step, and puts forward a measuring method to validate the curve of ratio-differential relaying and its inflexions.

关 键 词：变压器 差动保护 比率差动 校验方法 

分 类 号：TM407[电气工程—电器]