Single-Ended Traveling-Wave-Based Fault Location Algorithm for Hybrid Transmission Line Based on the Full-Waveform
Deng Feng1,2, Li Xinran1, Zeng Xiangjun2
1. College of Electrical and Information Engineering Hunan University Changsha 410082 China; 2. College of Electrical and Information Engineering Changsha University of Science & Technology Changsha 410114 China;
Abstract In transmission lines composed of multi-sectional overhead lines and underground cables, due to the difference between traveling wave velocities in overhead line and underground cable, the traditional traveling wave-based fault location algorithm for uniform transmission line is not suitable. Based on the transmission characteristics and the refraction and reflection mechanism of traveling wave, the traveling waveform similarity and difference in the time-frequency domain between the faults occur within section and at adjacent sections are qualitatively analyzed. On this basis, the full-waveform representation of the traveling wave in the time-frequency domains is proposed, and then the one-to-one correspondence relationship between the full-waveform and the fault location is revealed. Extracting the full-waveform within a certain time window, all frequency band coefficients can be obtained by CWT, and then they were divided into small time-frequency pieces which had the same frequency bandwidth and time interval. The time-frequency spectrum matrix was built, and the accurate fault position can be calculated by using the waveform matching technology. The proposed method has clearly physical meaning, which can be used both in hybrid and uniform transmission lines. There is no need to use the modal component velocities, the initial traveling wave-front arrival times and its subsequent reflection waveforms. Extensive simulations under different conditions verify the wide applicability and high accuracy of the proposed algorithm.
Deng Feng,Li Xinran,Zeng Xiangjun. Single-Ended Traveling-Wave-Based Fault Location Algorithm for Hybrid Transmission Line Based on the Full-Waveform[J]. Transactions of China Electrotechnical Society, 2018, 33(15): 3471-3485.
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2018, Vol. 33 
