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计及电子式电流互感器的差动保护性能分析
引用本文:及洪泉,张健,杨以涵,李岩松,郭志忠.计及电子式电流互感器的差动保护性能分析[J].电网技术,2006,30(23):61-66.
作者姓名:及洪泉  张健  杨以涵  李岩松  郭志忠
作者单位: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
基金项目: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(current transducer,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(electronic current transducer,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IEC 61850标准的光纤纵差保护装置的应用接口设计方案。

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(OCT)
文章编号:1000-3673(2006)23-0061-06
收稿时间:2006-06-02
修稿时间:2006年6月2日

Comment on Performance of Differential Protection Taking into Account Electronic Current Transducers
JI Hong-quan,ZHANG Jian,YANG Yi-han,LI Yan-song,GUO Zhi-zhong.Comment on Performance of Differential Protection Taking into Account Electronic Current Transducers[J].Power System Technology,2006,30(23):61-66.
Authors:JI Hong-quan  ZHANG Jian  YANG Yi-han  LI Yan-song  GUO Zhi-zhong
Affiliation:1. School of Electrical and Electronic Engineering, North China Electric Power University, Changping District, Beijing 102206, China; 2. Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China
Abstract: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.
Keywords:current differential protection  current transducer saturation  electronic current transducer(ECT)  IEC 61850  optical current transducer(OCT)
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