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Energies 2019, 12(6), 1004; https://doi.org/10.3390/en12061004

Remote Monitoring of Joints Status on In-Service High-Voltage Overhead Lines

1
UAq EMC Laboratory, Department of Industrial and Information Engineering and Economics, University of L’Aquila, 67100 L’Aquila, Italy
2
TERNA S.p.A., 00100 Rome, Italy
*
Author to whom correspondence should be addressed.
Received: 9 February 2019 / Revised: 4 March 2019 / Accepted: 11 March 2019 / Published: 14 March 2019
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

This work presents the feasibility study of an on-line monitoring technique aimed to discover unwanted variations of longitudinal impedance along the line (also named “impedance discontinuities”) and, possibly, incipient faults typically occurring on high voltage power transmission lines, like those generated by oxidated midspan joints or bolted joints usually present on such lines. In this paper, the focus is placed on the application and proper customization of a technique based on the time-domain reflectometry (TDR) technique when applied to an in-service high-voltage overhead line. An extensive set of numerical simulations are provided in order to highlight the critical points of this particular application scenario, especially those that concern the modeling of both the TDR signal injection strategy and the required high-voltage coupling devices, and to plan a measurement activity. The modeling and simulation approach followed for the study of either the overhead line or the on-line TDR system is fully detailed, discussing three main strategies. Furthermore, some measurement data that were used to characterize the specific coupling device selected for this application at high frequency—that is, a capacitive voltage transformer (CVT)—are presented and discussed too. This work sets the basic concepts underlying the implementation of an on-line remote monitoring system based on reflectometric principles for in-service lines, showing how much impact is introduced by the high-voltage coupling strategy on the amplitude of the detected reflected voltage waves (also named “voltage echoes”). View Full-Text
Keywords: dynamic rating; midspan joints; TDR technique; high-voltage; overhead line; fault-detection; CVT; live-line coupling; signal processing; oxidation dynamic rating; midspan joints; TDR technique; high-voltage; overhead line; fault-detection; CVT; live-line coupling; signal processing; oxidation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Olivieri, C.; de Paulis, F.; Orlandi, A.; Giannuzzi, G.; Salvati, R.; Zaottini, R.; Morandini, C.; Mocarelli, L. Remote Monitoring of Joints Status on In-Service High-Voltage Overhead Lines. Energies 2019, 12, 1004.

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