基于测量阻抗轨迹的接地距离保护自适应整定方法  

Adaptive Setting Method of Grounding Distance Protection Based on Measured Impedance Trajectory

作　　者：金瑞[1] 林湘宁[2] 时伯年[1] JIN Rui;LIN Xiangning;SHI Bonian(Beijing Sifang Automation Co.,Ltd.,Beijing 100085,China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science and Technology),Wuhan 430074,China)

机构地区：[1]北京四方继保自动化股份有限公司,北京市100085 [2]强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市430074

出　　处：《电力系统自动化》2022年第14期185-192,共8页Automation of Electric Power Systems

摘　　要：当下级线路出口发生故障时,送电侧距离保护的测量阻抗轨迹可能进入距离保护Ⅰ段的动作区内,引发超越现象。为此,首先分析并比较了区外三相和单相经过渡电阻接地2种故障情况下接地距离元件的测量阻抗轨迹的位置关系。然后,以AREVA的P443线路距离保护装置的自适应偏移阻抗圆特性为例,提出了一种基于装置故障前的测量量预估测量阻抗轨迹并实时计算动作区的方法。最后,利用PSCAD/EMTDC仿真验证了所提方法的正确性。根据所提自适应方法调整阻抗动作区的偏移量,既能实时保证距离保护Ⅰ段覆盖最大的线路范围,又能保证下级线路出口故障时距离保护不误动。When fault occurs at the outlet of the downstream line, the measured impedance trajectory of the distance protection device on the power supply side may enter the trip area of distance protection zone Ⅰ, causing an overshoot phenomenon. In this regard, the positional relationship of the measured impedance trajectories of the grounding distance element is firstly analyzed and compared under two conditions, i.e., three-phase fault and single-phase fault grounding through transition resistance outside the protection range. Then, taking the adaptive offset impedance circle characteristic of AREVA P443 line distance protection device as an example, a method is proposed to estimate the measured impedance trajectory based on the measurement quantities before the fault happens and to calculate the trip zone in real time. Finally, PSCAD/EMTDC simulation is used to verify the correctness of the proposed method. Adjusting the offset of the impedance trip zone according to the proposed self-adaptive method can not only ensure that the distance protection zone Ⅰ covers the largest range of the line in real time, but also ensure that the protection will not mistrip with faults at the outlet of the downstream line.

关 键 词：接地距离保护 测量阻抗轨迹 自适应整定 偏移特性 

分 类 号：TM773[电气工程—电力系统及自动化]