Impedance-Based Fault Location Algorithm for Double-Circuit Transmission Lines Using Single-End Data
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Impedance‑Based Fault Location Algorithm for Double‑Circuit Transmission Lines Using Single‑End Data Mojtaba Nemati1 · Mehdi Bigdeli1 · Amir Ghorbani2 Received: 16 May 2019 / Revised: 30 January 2020 / Accepted: 5 June 2020 © Brazilian Society for Automatics--SBA 2020
Abstract Locating a fault in double-circuit transmission lines is a challenging task due to the mutual coupling effects between adjacent circuits of the line. Also, performance of impedance-based fault location schemes for double-circuit lines is adversely affected by fault resistance. Accurate fault location in double-circuit lines can be achieved if fault location schemes utilize reliable communication links. However, the communication links are not available or enabled in all transmission lines. To overcome such difficulty in fault location in double-circuit lines, a new fault location scheme is proposed for double-circuit transmission lines by using voltages and currents data extracted from single-end of the line. Only the negative-sequence current and voltage phasors during the fault are processed for calculating the fault location. The proposed fault location formula is derived by applying the Kirchhoff’s voltage law around the parallel circuits and shunt capacitances loops. Obtained formula is applicable for all types of unbalanced faults and accordingly classification of fault types and phase selection are not required. The proposed scheme is immune to the fault resistance and insensitive to mutual coupling effects. Evaluation results verify that the accuracy of the proposed algorithm is very high under various fault resistances, fault locations, and fault types. Keywords Fault location · Fault resistance · Double-circuit transmission lines · Fault locator (FL) · Negative-sequence circuit
1 Introduction When a fault occurs on the transmission line, it is important for the utilities to detect the fault location as quickly as possible to improve the service reliability. Therefore, the fast and accurate fault locator (FL) system is a main part of a transmission line system (IEEE Std 2004; Kezunovic and Perunicic 1999). The impedance-based fault location schemes calculate the fault location by utilizing the current and voltage measurements at the transmission line terminals. As a result, any factor that changes the impedance of the transmission line causes the fault location to be not accurately obtained. The impedance-based fault location schemes used for double-circuit transmission lines have two usual * Mehdi Bigdeli [email protected] 1
Department of Electrical Engineering, Zanjan Branch, Islamic Azad University, Zanjan, Iran
Department of Electrical Engineering, Abhar Branch, Islamic Azad University, Abhar, Iran
2
problems: effects of mutual coupling, and fault resistance (Eissa 2018). Various types of schemes for locating fault in double-circuit transmission lines can be found in literature (Elkalashy et al. 2016; Kang and Liao 2012, 2013; Apostolopoulos and Korres 2011; Funabashi et al. 2000; Song et al. 2005; Suonan et
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