基于电子式电流互感器的线路光纤纵差保护  

Differential Protection of Optical-fiber Line Based on Electronic Current Transformer

作　　者：王晓芳[1,2] 周有庆[2] 李付亮[2,3] 

机构地区：[1]邵阳学院电气工程系,湖南邵阳422004 [2]湖南大学电气与信息工程学院,湖南长沙410082 [3]湖南水利水电职业技术学院电力工程系,湖南长沙410131

出　　处：《高压电器》2009年第4期29-33,36,共6页High Voltage Apparatus

基　　金：湖南省教育厅科技项目(08c787)

摘　　要：基于Rogowski线圈的电子式电流互感器(ECT)没有饱和现象,可以从根本上解决由于CT饱和造成差动保护误动情况的发生。笔者阐述了ECT的暂态传变特性,论述了积分时间常数对Rogowski线圈暂态特性的影响。以线路光纤纵差保护为例,利用实验数据分析了采用ECT后纵差保护的性能,指出采用ECT后保护在区外故障可靠性、区内故障灵敏度方面有显著提高,继而改进了传统的二段式比率制动差动保护动作特性。鉴于实用化的要求,遵循IEC 61850标准给出了ECT与线路光纤纵差保护的接口实现方案,并设计了一款信息合并单元的硬件方案。The Rogowski coil based electronic current transformer has no saturation phenomenon, thus it can completely eliminate the misoperation of differential protection due to CT saturation. The transient characteristics of ECT and the impact of integration time constant on transient characteristics of Rogowski coil are described in this paper. Taking the fiber longitudinal differential line protection as an example, the performance of longitudinal differential protection using ECT is analyzed based on experimental data. It is shown that by using ECT, both the sensitivity and reliability of the relay protection are improved, and the operation property of conventional two-stage percentage restraint differential protection is meliorated. To meet the practical requirements, an implementing scheme of the interface between ECT and fiber longitudinal differential line protection is designed conforming to IEC 61850 standard. Moreover, a hardware scheme of data merging unit is proposed.

关 键 词：电子式电流互感器 ROGOWSKI线圈 线路光纤纵差保护 动作特性 IEC 61850 合并单元 

分 类 号：TM773[电气工程—电力系统及自动化]