The influence of CVT parameters on the harmonic transmission characteristics

Li, Zhao; Wei, Jianchun; Li, Qingquan; Xu, Guangke; Chen, Yufeng; Liu, Bin; Wang, Baohua; Qi, Zhenxin

doi:10.1109/iciea.2016.7603604

Cited by 6 publications

(2 citation statements)

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“…From the related literature, several efforts have been aimed at obtaining an accurate representation of CVTs, both in terms of frequency characterization and/or a lumped equivalent circuit [24][25][26][27][28]. The obtainment of the latter is of great interest for the sake of circuit simulation purposes.…”

Section: Frequency Characterization and Equivalent Circuit Of A Cvtmentioning

confidence: 99%

“…The obtainment of the latter is of great interest for the sake of circuit simulation purposes. In this study, the modeling of the CVT was done by starting from what was found in the literature, especially from [25,26], but by then customizing the equivalent circuit representation provided by theory using data from experimental measurements that were done on a real CVT effectively used for substation voltage measurement on a 132 kV overhead line. This was in effect a mint condition CVT characterized by the nameplate data reported in Table 1, for which the frequency response was determined using sweep frequency response analysis (SFRA) measurements.…”

Section: Frequency Characterization and Equivalent Circuit Of A Cvtmentioning

confidence: 99%

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

et al. 2019

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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”).

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Section: Frequency Characterization and Equivalent Circuit Of A Cvtmentioning

confidence: 99%

Section: Frequency Characterization and Equivalent Circuit Of A Cvtmentioning

confidence: 99%