Broadband measurement of the conductivity and the permittivity of semiconducting materials in high voltage XLPE cables

Heinrich, Ralf; Bönisch, S.; Pommerenke, David; Jobava, R.; Kalkner, W.

doi:10.1049/cp:20000507

Cited by 32 publications

(24 citation statements)

References 4 publications

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“…, 12. This information is based on data sheets and drawings, but also on available literature [11][12][13]35]. It is e.g., well known that the real permittivity of the semi-conducting layers (conductor screen and insulation screen) can be very large [12,13,35], and that the swelling tapes of the conductor binder and the longitudinal water barrier are usually semi-conducting [11].…”

Section: Numerical Examplesmentioning

confidence: 99%

“…This information is based on data sheets and drawings, but also on available literature [11][12][13]35]. It is e.g., well known that the real permittivity of the semi-conducting layers (conductor screen and insulation screen) can be very large [12,13,35], and that the swelling tapes of the conductor binder and the longitudinal water barrier are usually semi-conducting [11]. The most crucial parameters at low frequencies are the conductivities of the conductor, the lead sheath and the armour which have been modeled here for an ambient temperature 3 of 30 • C. It is noted that the conductivity of copper (σ = 5.0·10 7 S/m at 20 • C) has been modified with respect to the correct copper area (roughly 91% for hexagonal close packed threads) and the conductivity of steel (σ = 5.55 · 10 6 π/4 S/m at 20 • C) has been modified with respect to a rectangular close packing of wires.…”

Section: Numerical Examplesmentioning

confidence: 99%

“…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%

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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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Section: Numerical Examplesmentioning

confidence: 99%

Section: Numerical Examplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dispersion Modeling and Analysis for Multilayered Open Coaxial Waveguides

Nordebo

Çınar

Gustafsson

et al. 2015

IEEE Trans. Microwave Theory Techn.

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“…The effective relative permittivity is the combination between resistive layers and XLPE. The authors in [16]- [18] report values between 10 2 and 10 4 for the relative permittivity ε r in the outer resistive layer for semicon cables.…”

Section: A High-voltage Cablementioning

confidence: 99%

“…The resistive layers has conductivity σ = 7 S/m, and if we use ε r = 1, the electric field totally occupies the resistive layers, which is not the case. Therefore, the relative permittivity is set to ε r = 10 3 , which is supported by measurements made in [16]- [18].…”

Section: Commentsmentioning

confidence: 99%

An Inductive 700-MW High-Voltage Pulse Generator

Lindblom

Bernhoff

Isberg

et al. 2006

IEEE Trans. Plasma Sci.

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A repetitive inductive 700-MW high-voltage pulse generator that delivers a 150-ns square pulse with 20-ns rise time at 150 kV has been constructed. The pulse generator has a 1:10 air core transformer connected to a 25-Ω pulse forming line (PFL). The transformer and the PFL are both constructed using highvoltage cables. The closing switch of the PFL is a spark gap that is in a water tank together with the cable endings of the PFL and transformer. The electric field at the cable endings is refractively graded by the high permittivity of the surrounding water. The PFL is charged in 2.5 µs to 170 kV, and the electric field in the closing switch of the PFL reaches 33 kV/mm until the threshold voltage is exceeded. The efficiency of the pulse generator is 40%. The authors believe that this concept can be up-scaled to a 25-GW generator operating at 500 kV. An electric circuit simulation of a 25-GW pulse generator and an electrostatic simulation for a refractive cable ending are presented.Index Terms-High-voltage cable, inductive pulse generator, refractive field grading, resistive layer.

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