NDLI: Breakdown strength of solid ∣ solid interfaces

Content Provider	IEEE Xplore Digital Library
Author	Hasheminezhad, S.M.
Copyright Year	2011
Description	Author affiliation: Department of Electrical Power Engineering, The Norwegian University of Science and Technology, N-7491 Trondheim, Norway (Hasheminezhad, S.M.)
Abstract	The longitudinal breakdown strength of Interfaces is low because combination of two solid dielectrics enhances the risk of cavities and moisture at the interfaces. This paper presents the measured results of AC 50Hz breakdown voltage test of XLPE - XLPE interfaces assembled either under water or in standard laboratory conditions in air. A theoretical model for the voltage drops across contact spots and voids is proposed for both dry and wet interfaces. The model utilizes the estimated void dimension and number of voids formed at the interface in order to estimate the difference between the breakdown voltage of dry and wet interfaces. The estimated difference between the breakdown voltages was compared with the measured value. There is moderate agreement between the estimated results and the measured ones. The measured breakdown strength of wet interfaces was around 4.5 kV/mm whereas that of dry ones was measured to be around 8.0 kV/mm. In the case of wet interfaces, the nominal voltage of connectors may be designed based on the electric field of approximately 0.5 kV/mm along the interface.
Starting Page	1
Ending Page	7
File Size	1228237
Page Count	7
File Format	PDF
ISBN	9781424484195
e-ISBN	9781424484188
e-ISBN	9781424484171
DOI	10.1109/PTC.2011.6019392
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-19
Publisher Place	Norway
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electric breakdown Surface roughness Rough surfaces Insulation Voltage measurement Breakdown voltage Connectors breakdown strength Subsea connector solid insulating materials interface water droplet
Content Type	Text
Resource Type	Article

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