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Enhancing the performance of directional relay using a positive-sequence superimposed component
Electrical Engineering ( IF 1.8 ) Pub Date : 2019-12-04 , DOI: 10.1007/s00202-019-00896-5
Ahmed R. Adly , Ziad M. Ali , Alaa M. Abdel-hamed , Said A. Kotb , Hala M. Abdel Mageed , Shady H. E. Abdel Aleem

In this article, we propose a fault directional identification scheme that depends on the positive-sequence components of current based on an investigation of pre-fault and fault phase angles. The proposed protection scheme is developed for both distribution and transmission systems. However, as the current-only approach depends on the pre-fault current direction as the polarizing quantity, if the pre-fault current direction changes during normal conditions, the direction definitions would be swapped. This will cause a problem for the current-only approach. Therefore, a signal processing-based solution is presented, leveraging the fact that a change in direction in the pre-fault condition is associated with a phase angle change of 180°. The proposed protection scheme is examined with two different power system configurations (distribution and transmission systems). Simulation experiments conducted using ATP/EMTP software verified the feasibility of the proposed protection scheme. Moreover, the validity of the proposed protection scheme is compared with that of other directional schemes. The results confirmed the accurate operation of the proposed scheme.

中文翻译:

使用正序叠加元件提高方向继电器的性能

在本文中,我们基于对故障前和故障相角的调查,提出了一种故障方向识别方案,该方案依赖于电流的正序分量。建议的保护方案是为配电和输电系统开发的。然而,由于仅电流方法取决于故障前电流方向作为极化量,如果故障前电流方向在正常条件下发生变化,则方向定义将互换。这将导致仅电流方法出现问题。因此,提出了一种基于信号处理的解决方案,利用故障前条件下的方向变化与 180° 的相角变化相关的事实。建议的保护方案通过两种不同的电力系统配置(配电和传输系统)进行检查。使用 ATP / EMTP 软件进行的仿真实验验证了所提出的保护方案的可行性。此外,将所提出的保护方案的有效性与其他定向方案的有效性进行了比较。结果证实了所提出方案的准确运行。
更新日期:2019-12-04
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