NDLI: Influence of board density on the conductivity of oil-impregnated pressboard for HVDC insulation systems

Content Provider	IEEE Xplore Digital Library
Author	Schober, F. Kuchler, A. Exner, W. Krause, C. Berger, F.
Copyright Year	2015
Description	Author affiliation: Univ. of Appl. Sci. Wurzburg-Schweinfurt, Schweinfurt, Germany (Schober, F.; Kuchler, A.) \|\| WEIDMANN Electr. Technol. AG, Rapperswil, Switzerland (Exner, W.; Krause, C.) \|\| Tech. Univ. of Ilmenau, Ilmenau, Germany (Berger, F.)
Abstract	In HVDC (high voltage direct current) insulation systems, the conductivities of the insulating materials pressboard and oil are the relevant material parameters that determine the field distribution. The pressboard conductivity depends on various parameters, which can be categorized in service-parameters (e. g. time of energization, water content, impregnating fluid) and parameters during pressboard manufacturing (e. g pressboard density). Measurements of pressboard with different densities are performed by using a step response measurement in time domain. At first, the materials are impregnated with gas. It is found that electrical conductivity increases with an increase in pressboard density. The reason is that gas has a much lower conductivity than pressboard and therefore, a larger number of fibers per volume causes a higher conductivity than a smaller fiber number. Afterwards, pressboards with different densities are impregnated under vacuum with two types of mineral oil (a low-conductive oil and a high-conductive oil). For the low-conductive oil, the influence of the pressboard density is little, because conductivities and electric field stresses are similar, both for pressboard fibers and for oil. By impregnation with the high-conductive oil, the pressboard pores have a much higher conductivity than the surrounding pressboard fibers and thus the conductivity of the oil-impregnated pressboard depends on pressboard density again. In this case, a low-density pressboard has therefore a higher conductivity than a high-density pressboard corresponding to the different fiber volume and oil volume. The pressboard density can be modified during manufacturing and the designer can choose which pressboard density and which oil with a certain oil-conductivity should be used in a certain HVDC apparatus leading to desired conductivity values for the oil-pressboard system.
Starting Page	61
Ending Page	64
File Size	325079
Page Count	4
File Format	PDF
ISBN	9781479973521
e-ISBN	9781479973545
DOI	10.1109/ICACACT.2014.7223482
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-06-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ducts impregnating fluid HVDC transmission insulation pressboard electrical conductivity density
Content Type	Text
Resource Type	Article

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