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

Carlo Olivieri, Francesco de Paulis, Antonio Orlandi, Giorgio Giannuzzi, Roberto Salvati, Roberto Zaottini, Carlo Morandini and Lorenzo Mocarelli
Additional contact information
Carlo Olivieri: UAq EMC Laboratory, Department of Industrial and Information Engineering and Economics, University of L’Aquila, 67100 L’Aquila, Italy
Francesco de Paulis: UAq EMC Laboratory, Department of Industrial and Information Engineering and Economics, University of L’Aquila, 67100 L’Aquila, Italy
Antonio Orlandi: UAq EMC Laboratory, Department of Industrial and Information Engineering and Economics, University of L’Aquila, 67100 L’Aquila, Italy
Giorgio Giannuzzi: TERNA S.p.A., 00100 Rome, Italy
Roberto Salvati: TERNA S.p.A., 00100 Rome, Italy
Roberto Zaottini: TERNA S.p.A., 00100 Rome, Italy
Carlo Morandini: TERNA S.p.A., 00100 Rome, Italy
Lorenzo Mocarelli: TERNA S.p.A., 00100 Rome, Italy

Energies, 2019, vol. 12, issue 6, 1-17

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”).

Keywords: dynamic rating; midspan joints; TDR technique; high-voltage; overhead line; fault-detection; CVT; live-line coupling; signal processing; oxidation (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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