计及电子式电流互感器的差动保护性能分析  

Comment on Performance of Differential Protection Taking into Account Electronic Current Transducers

作　　者：及洪泉[1] 张健[2] 杨以涵[1] 李岩松[1] 郭志忠[2] 

机构地区：[1]华北电力大学电气与电子工程学院,北京市昌平区102206 [2]哈尔滨工业大学电气工程系,黑龙江省哈尔滨市150001

出　　处：《电网技术》2006年第23期61-66,共6页Power System Technology

基　　金：国家自然科学基金资助项目(50347023);高等学校博士学科点专项科研基金资助项目(20030079007)~~

摘　　要：电磁型电流互感器(currenttransducer,CT)饱和是造成差动保护误动的重要原因,为此采取的差动保护抗CT饱和措施使保护算法和判据更加复杂,可靠性降低。电子式电流互感器(electroniccurrenttransducer,ECT)具有无磁饱和等优点,可从根本上解决上述问题。文章在分析、比较基于3种不同CT特性的比率制动差动保护动作特性的基础上,给出了相应的动作区示意图,并指出采用ECT可显著提高差动保护的灵敏性;在基于全电流的采样值差动保护中,光学电流互感器具有无可比拟的优点。此外,给出了光学电流互感器与基于IEC61850标准的光纤纵差保护装置的应用接口设计方案。The saturation of electromagnetic current transducers is an important reason causing mal-operation of current differential protection, and anti-saturation measures adopted for this make the protection arithmetic and trip criterion more complex, and reduce the reliability of protective relaying. This problem can be settled at the root by adopting electronic current transducer （ECT） without the trouble of saturation. By means of analyzing and comparing action characteristics of three ratio restraint differential protections based on different CTs, corresponding operation-resistance curves are given, and it is pointed out that the sensitivity of differential protection can be evidently improved by using ECT As for differential protection based on full current sampling, optical current transducer （OCT） possesses unmatchable advantages. In addition, a design scheme for application interface of OCT with optical-fiber line differential protection device based on IEC 61850 is given.

关 键 词：电流差动保护 电流互感器饱和 电子式电流互感器(ECT) IEC 61850 光学电流互感器(0CT) 

分 类 号：TM771[电气工程—电力系统及自动化]