Volume 19, Issue 2 (June 2023)                   IJEEE 2023, 19(2): 2658-2658 | Back to browse issues page

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Yaghobi H. Real-Time Discrimination of Symmetrical Faults from Power Swings. IJEEE 2023; 19 (2) :2658-2658
URL: http://ijeee.iust.ac.ir/article-1-2658-en.html
Real-Time Discrimination of Symmetrical Faults from Power Swings
H. Yaghobi
Abstract:   (1106 Views)
For reliable operation, distance relays have to be blocked in case of stable power swings (SPSs). Because these relays are prone to detect an SPS as a symmetrical 3-phase fault according to their symmetric nature. It should be noted that there are zero and negative sequence components during asymmetrical faults. However, these components do not exist during stable fluctuations or symmetrical faults. Consequently, according to the symmetric nature of the stable fluctuation, the distance relay may experience maloperation. This article proposes a new technique to discriminate a symmetrical 3-phase fault from an SPS. The proposed technique is based on the extraction of the exponentially decaying DC component in the 3-phase current by using the MIMIC impedance. This technique can detect the symmetrical fault in less than a quarter of one power cycle. The suitability of the technique is shown by simulating various symmetrical faults during fast and slow SPS conditions.
 
Keywords: Maloperation of Distance Relay, Mimic Impedance, Power swings, Symmetrical Faults.
Full-Text [PDF 987 kb]   (615 Downloads)    
Type of Study: Research Paper | Subject: Relaying
Received: 2022/09/12 | Revised: 2023/06/06 | Accepted: 2023/06/11
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Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
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© 2022 by the authors. Licensee IUST, Tehran, Iran. This is an open access journal distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license.