Sequential Data-Based Fault Location for Single-Line-to-Ground Fault in a T-Connection Power Line

Lisheng Li, Haidong Yu, Bin Wang (), Yang Liu, Yuanyuan Lu and Wenbin Liu
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Lisheng Li: State Grid Shandong Electric Power Research Institute, Jinan 250003, China
Haidong Yu: State Grid Shandong Electric Power Research Institute, Jinan 250003, China
Bin Wang: National Key Laboratory of New Power System Operation and Control, Department of Electrical Engineering Tsinghua University, Haidian District, Beijing 100084, China
Yang Liu: State Grid Shandong Electric Power Research Institute, Jinan 250003, China
Yuanyuan Lu: National Key Laboratory of New Power System Operation and Control, Department of Electrical Engineering Tsinghua University, Haidian District, Beijing 100084, China
Wenbin Liu: State Grid Shandong Electric Power Research Institute, Jinan 250003, China

Energies, 2024, vol. 17, issue 12, 1-13

Abstract: Due to the demand for temporary rapid grid connection in renewable energy power plants, the topology structure of T-connected power lines has been widely used in the power grid. In this three-terminal system, fault localization is difficult because of traditional impedance-based or traveling wave-based fault localization methods; the three-terminal data should be synchronized and communicated. Since different terminal assets belong to different enterprises, it is actually difficult to maintain good synchronization between them. Therefore, in practical applications, the fault location of T-connected power lines often fails. This article proposes a single terminal fault location method for a T-connection power line to address this issue. It is based on the fact that the local topology of the T-connected power line in the healthy phase remains unchanged during the fault-clearing process. It utilizes the sequential current and voltage data changes generated by the sequential tripping ping emitted by the circuit breaker from different terminals to describe the constant topology of the healthy phase as an equation and calculates the accurate fault location after solving the equation. The Levenberg–Marquardt algorithm was used to calculate fault distance and transition resistance, and the effectiveness of this method was verified through simulation.

Keywords: T connection; fault location; sequential data; circuit breaker tripping (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: 2024
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