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Analytical Description of Overhead Transmission Lines Loadability
Open AccessArticle

The Half-Sine Method: A New Accurate Location Method Based on Wavelet Transform for Transmission-Line Protection from Single-Ended Measurements

Dpto. Ingeniería Eléctrica, Universidad de Zaragoza, 50018 Zaragoza, Spain
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Energies 2019, 12(17), 3293; https://doi.org/10.3390/en12173293
Received: 21 June 2019 / Revised: 18 August 2019 / Accepted: 24 August 2019 / Published: 27 August 2019
(This article belongs to the Special Issue DC and AC Overhead Transmission Lines from Low to Extra-High Voltages)
In this work, a new and accurate method based on the wavelet transform is proposed for fault location in transmission-line systems. The proposed wavelet method consists of the analysis of the transient signal measured at a single end of the transmission line. Aerial current modes are used, and zero modes are included in the fault-detection scheme for low fault-inception angles. The fault distance is evaluated using the wavelet modulus maxima technique and a method based on the response to a half-sine voltage is proposed to overcome drawbacks arising from the limited sampling frequency and low fault-inception angle. The fault distance is calculated using the difference between the time when a 100 kHz half-sine signal is sent and the time when the derivative signal is received. The proposed algorithm is tested considering harmonic distortion and varying fault resistance, ground resistivity, location and inception angle. The high accuracy of the proposed algorithm is obtained even for faults close to the bus and low inception angles. View Full-Text
Keywords: fault location; discrete wavelet transform; traveling waves; fault detection; transmission-line protection fault location; discrete wavelet transform; traveling waves; fault detection; transmission-line protection
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Martín Arroyo, S.; García-Gracia, M.; Montañés, A. The Half-Sine Method: A New Accurate Location Method Based on Wavelet Transform for Transmission-Line Protection from Single-Ended Measurements. Energies 2019, 12, 3293.

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