复合电流滤过器K值偏移对相差保护的影响  

INFLUENCE OF DEVIATION OF THE K VALUE OF COMPOUND CURRENT FILTER ON PHASE DIFFERENTIAL HIGH FREQUENCY PROTECTION

作　　者：崔风亮 

机构地区：[1]东营电业局,山东东营257027

出　　处：《电力系统自动化》2001年第17期43-44,62,共3页Automation of Electric Power Systems

摘　　要：在相差高频保护中 ,保证线路两端复合电流 ( I.1+ KI.2 )滤过器的 K值相同非常重要 ,若 K值存在偏差 ,其输出操作电流之间就存在相位差δ ,使发信机发出的高频信号间也存在相位差 ,不能反映实际故障电流的相位 ,影响保护装置正确判断区内外故障。文中利用对称分量法 ,计算了在单相、两相短路等故障情况下 ,线路两端 K值偏移大小对应带来操作电流之间相位差的大小。经研究得出 :线路两端相差高频保护装置的 K值偏差越大 ,复合电流滤过器输出操作电流之间相位差就越大 ,对相差高频保护装置正确判断区内外故障越不利。最后提出了控制In phase differential high frequency protection, how to control the deviation of the K for compound current (I1 + Kl2) filter at both ends of the power line is important. If the K value deviates from the control target, the output current of the filter will produce phase difference δ, and the protective gear can not distinguish the true fault current phase, which influences the protection correctness in the protected zone. This paper uses the symmetrical component method under single-phase short circuit and phase-to-phase short circuit conditions, and calculates the output currents phase difference when K value deviates. By calculation and analysis, the relation between the protection correctness and the deviation of the K value from the target is obtained. Some methods to control the deviation of K value are presented.

关 键 词：相差高频保护 复合电流滤过器 故障分析 电力系统 继电保护 

分 类 号：TM773[电气工程—电力系统及自动化]