Influence of semiconducting layers on the attenuation behaviour of single-core power cables

Steinbrich, Kai

doi:10.1049/ip-gtd:20050953

Cited by 26 publications

(18 citation statements)

References 1 publication

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“…However, as input for a travelling wave fault locator system, a coaxial velocity which is measured on the real-life cable should be given as input. The result is confirmed by field measurements in [113] where it is shown valid up till 1 MHz.…”

Section: Frequency Dependent Permittivitysupporting

confidence: 73%

Online Location of Faults on AC Cables in Underground Transmission Systems

Jensen

2014

Springer Theses

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University in partial fulfilment of the requirements for the PhD degree in Electrical Engineering. The research has been carried out between the 1.09.2010 and the 15.07.2013 at the Department of Energy Technology for Energinet.dk by which I was hired as a PhD-student for the entire project period.The project has been followed full time by two supervisors: Professor Claus Leth Bak (Department of Energy Technology) and Dr. Unnur Stella Gudmundsdottir (Energinet.dk).Energinet.dk has fully funded the research leading to this thesis "Online Location of Faults on AC Cables in Underground Transmission Systems". This funding has been vital for this research project. Travelling to conferences, two visits at forging research institutions, renting of laboratory equipment and performance of and field measurements was made possible thanks to support from the company. During the projet period I supervised two master projects and thought one semester course in power system transients.The scientific papers written as a part of this PhD are included in the back of both the printed version of the thesis as well as in the PDF-file. The papers should not be considered a part of this monograph, but are enclosed if the reader is interested.This thesis has five parts and appendices. An overall literature reference list is presented at the end of the main report. A list of the authored publications is presented at the end of the thesis. Literature references are shown as [i], where i is the number of the literature in the reference list. Tables, figures and equations are shown as C.F, where C is the chapter number and F is a unique number for the figure or table. AcknowledgementsI owe gratitude to many people who helped me in different ways. I would like to thank:• My supervisors, Claus Leth Bak and Unnur Stella Gudmundsdottir for all their help, comments, and many technical discussions during the last three years.• Carl-Erik Madsen, Henrik Kastberg and Carl Willi Hansen for their help with carrying out the field measurements. In the same regards, a very special thanks is extended to Filipe Faria da Silva and Unnur Stella Gudmundsdottir for participating during all measurements.• Filipe Faria da Silva for numerous technical discussions, for reading large parts of the thesis and for many good times in the office.• Rasmus Schmidt Olsen, Unnur Stella Gudmundsdottir, Joachim Holbøll, Per Balle Holst, Poul Erik Pedersen, Thomas Kvarts, Carsten Rasmussen, Claus Leth Bak and Bjarne Søndergaard Bukh for their contributions and comments during the project period.• Everyone at the transmission department at Energinet.dk for their contributions.• Professor Ali Abur for his hospitality and comments to my work during my three month stay at North Eastern University in Boston 2012.• • A special thanks to Dr. Jeewantha Da Silva for numerous discussions, valuable advice and guidance throughout the entire project period.• To Prof. Athula Rajapakse and PhD-student Kasun Nanayakkara both from University of Manitoba, Winnipeg, Manitoba for valuable discuss...

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Section: Frequency Dependent Permittivitysupporting

confidence: 73%

Online Location of Faults on AC Cables in Underground Transmission Systems

Jensen

2014

Springer Theses

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“…Application examples include transient signal analysis and partial discharge diagnostics to enable cable maintenance and repair without (or with very short) power losses, see e.g., [4,28,30,32]. Hence, there is today an increasing interest to improve both measurement techniques and modeling regarding the wave propagation characteristics of power cables and its dependency on various material and structural parameters, see e.g., [2,10,12,13,16,18,20,27,29,35].…”

Section: Introductionmentioning

confidence: 99%

Dispersion Modeling and Analysis for Multilayered Open Coaxial Waveguides

Nordebo

Çınar

Gustafsson

et al. 2015

IEEE Trans. Microwave Theory Techn.

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Abstract-This paper presents a detailed modeling and analysis regarding the dispersion characteristics of multilayered open coaxial waveguides. The study is motivated by the need of improved modeling and an increased physical understanding about the wave propagation phenomena on very long power cables which has a potential industrial application with fault localization and monitoring. The electromagnetic model is based on a layer recursive computation of axial-symmetric fields in connection with a magnetic frill generator excitation that can be calibrated to the current measured at the input of the cable. The layer recursive formulation enables a stable and efficient numerical computation of the related dispersion functions as well as a detailed analysis regarding the analytic and asymptotic properties of the associated determinants. Modal contributions as well as the contribution from the associated branch-cut (non-discrete radiating modes) are defined and analyzed. Measurements and modeling of pulse propagation on an 82 km long HVDC power cable are presented as a concrete example. In this example, it is concluded that the contribution from the second TM mode as well as from the branch-cut is negligible for all practical purposes. However, it is also shown that for extremely long power cables the contribution from the branch-cut can in fact dominate over the quasi-TEM mode for some frequency intervals. The main contribution of this paper is to provide the necessary analysis tools for a quantitative study of these phenomena.

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“…However, there are numerous existing and potential high-frequency applications for signal transmission on power cables, as e.g., with power line communication (PLC) techniques [28], simulation and analysis of lightning and switching overvoltages [28], transient based protection [2] and fault localization and Partial Discharge (PD) monitoring [24,29,32]. The present study is motivated in particular by the potential of improving the fault localization and diagnosis techniques for High-Voltage Direct Current (HVDC) submarine power cables based on detection and analysis of transient (virgin) pulses caused by dielectric breakdown.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, it has been of great interest recently to study measurements and modeling regarding the semiconducting layers of a power cable and its eect on wave propagation characteristics [1,3,28]. It has been shown, e.g., that the semiconducting layer contributes signicantly to the attenuation for frequencies above 5-10 MHz [28].…”

Section: Introductionmentioning

confidence: 99%