Study of Fault Direction Characteristic of Half-Wave-Length AC Transmission Lines

被引：0
|
作者：
Lei A. [1 ]
Dong X. [1 ]
Feng T. [1 ]
Tang L. [1 ]
机构：
[1] State Key Lab of Control and Simulation of Power Systems and Generation Equipments, Dept. of Electrical Engineering, Tsinghua University, Haidian District, Beijing
来源：
Dianwang Jishu/Power System Technology | 2017年 / 41卷 / 12期
关键词：
Directional element; Fault direction; Half-wave-length; Transmission lines; UHV;
D O I：
10.13335/j.1000-3673.pst.2017.0918
中图分类号：
学科分类号：
摘要：
As a very long-distance transmission technology, half-wave-length AC transmission (HWACT) attracts extensive attention. Fault characteristics of HWACT lines are different from those of conventional transmission lines. Therefore, conventional directional elements need to be further studied when applying to HWACT lines. This paper studied fault directionality represented with steady fundamental quantities, superimposed fundamental quantities and fault traveling waves when a fault occurs on HWACT lines by means of theoretical derivation and simulation analysis. Compared with conventional transmission lines, when a reverse faults happen on a HWACT line, phase difference between voltage and current of steady fundamental quantities (zero sequence quantity) and superimposed fundamental quantities will not fall in range of 45°~90°. Besides, when fault traveling waves are applied to characterize fault direction of HWACT lines, appropriate frequency band should be smaller than the common used value (several tens of kilohertz or a few hundred kilohertz) for conventional transmission lines. Study in this paper demonstrates feasibility of steady fundamental quantities, fault superimposed fundamental quantities and fault traveling waves in identifying fault direction, but detailed fault direction characteristics of HWACT lines are different from those of conventional transmission lines. The results can lay a foundation for directional elements applying to HWACT lines. © 2017, Power System Technology Press. All right reserved.
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页码：3832 / 3838
页数：6
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