NDLI: Comparison of the electric and dielectric behaviour of different insulating fluids

Content Provider	IEEE Xplore Digital Library
Author	Beyer, M. Borsi, H.
Copyright Year	1990
Description	Author affiliation: Schering-Inst. for High Voltage Eng. & High Voltage Plants, Hannover Univ., Germany (Beyer, M.; Borsi, H.)
Abstract	The authors consider ester fluid Midel 7131 and silicon fluid for use in distribution transformers. The electrical and dielectric properties of the two fluids were determined in new condition and after an aging period of 1000 h under severe conditions. The dielectric dissipation factor tan delta was almost the same for the silicon and ester fluid in the temperature range between 0 and 120 degrees C. A temperature change from 20 to 120 degrees C increased these values from about 710/sup -2/ to about 310/sup -1/. The dielectric strength of the fluids is highly dependent on humidity. A 1000-h aging process at 150 degrees C under the influence of 3 g/1 Cu, 3 g/1 Fe, 3 g/l Al, and atmospheric oxygen caused an increase in tan delta by two orders of magnitude, whereas there was no significant change to be observed with the silicon fluid. The electric strength was reduced for both fluids by a 1000-h aging process. The effect of this aging process was more pronounced with the silicon fluid than with the ester fluid.<>
Starting Page	524
Ending Page	528
File Size	237372
Page Count	5
File Format	PDF
DOI	10.1109/ICDL.1990.202958
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1990-09-10
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Dielectrics and electrical insulation Silicon Circuit testing Aging Humidity Voltage measurement Electric variables measurement Monitoring Electric breakdown Circuit synthesis
Content Type	Text
Resource Type	Article

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