基于同侧电流变化的线路方向保护算法研究  

A circuit directional protection algorithm based on current changes with one side protects

作　　者：焦姣[1] 和敬涵[1] 

机构地区：[1]北京交通大学电气工程学院,北京100044

出　　处：《电力系统保护与控制》2008年第17期1-4,共4页Power System Protection and Control

基　　金：国家自然科学基金资助项目(50677003);北京交通大学科研基金资助(EJ06005)~~

摘　　要：在输电线路发生故障时,故障电流与正常运行负荷电流的相位变化存在一定的规律,利用此规律可以构成一种新的方向元件。通过上述对负荷电流与故障电流相位关系的定性分析,提出了一种基于同侧电流变化的线路方向保护算法,它通过判断故障前后的电流的相位关系构成了一种新型的方向元件,来判断故障区域。这种判别方法作为方向元件只用到了电流信息,可以应用于双端以及多电源的线路故障判断,尤其是电压过小时的故障判断,可以较好解决传统方法在电压过低时误判而导致误动的情况。通过大量的EMTDC/MATLAB仿真验证,表明这种新型的判别算法是正确可行的。During the period of the fault of transmission lines, there exists the certain law in voltaic phase change between the fault electric current and regular load current, then a new direction element is made use of this. This passage brings forward a new circuit directional protection algorithm based on current changes which can be used in judging the fault areas while analyzing the relationships of the phase between load current and the fault current. This method only uses the information of electric current and can be applied to the judges of the transmission line fault of the sub-stations, especially when the voltage goes below the standard or can not be measured. This method can well solve the problem when the relay acts by mistake under the traditional method when the voltage goes too low. Besides, the abundant simulating tests by EMTDC/MATLAB verify that this new algorithm is correct and feasible.

关 键 词：负荷电流 故障电流 方向元件 相位信息 

分 类 号：TM773[电气工程—电力系统及自动化]