Fault Model and Travelling Wave Matching Based Single Terminal Fault Location Algorithm for T-Connection Transmission Line: A Yunnan Power Grid Study

Hongchun Shu, Yiming Han, Ran Huang, Yutao Tang, Pulin Cao, Bo Yang and Yu Zhang
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Hongchun Shu: Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China
Yiming Han: Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China
Ran Huang: Electric Power Research Institute of Yunnan Power Grid Co., Ltd., Kunming 650217, China
Yutao Tang: Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China
Pulin Cao: Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China
Bo Yang: Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China
Yu Zhang: Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China

Energies, 2020, vol. 13, issue 6, 1-22

Abstract: Due to the complex structure of the T-connection transmission lines, it is extremely difficult to identify the reflected travelling wave from the fault point and that from the connection point by the measurement from only one terminal. According to the characteristics of the structure of the T-connection transmission line, the reflection of the travelling wave within the line after the failure of different sections in T-connection transmission line are analyzed. Based on the lattice diagram of the travelling wave, the sequence of travelling waves detected at the measuring terminal varies with the fault distance and the faulty section. Moreover, the sequence of travelling waves detected in one terminal is unique at each faulty section. This article calculates the arrival time of travelling waves of fault points at different locations in different sections to form the collection of the travelling wave arrival time sequence. Then the sequence of travelling waves of the new added fault waveforms is extracted to compare with the sequences in the collection for the faulty section identification and fault location. This proposed method can accurately locate the fault with different fault types, fault resistances and system impedances by only single-terminal fault data. Both Power Systems Computer Aided Design/ Electromagnetic Transients including DC (PSCAD/EMTDC) and actual measurement data are implemented to verify the effectiveness of this method.

Keywords: T-connection transmission line; Single-terminal fault location; travelling wave arrival time; travelling wave reflection (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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