NDLI: Evaluation and suppression of flow electrification of paraffinic based transformer oil

Content Provider	IEEE Xplore Digital Library
Author	Patel, M.J. Shrinet, V.
Copyright Year	1998
Description	Author affiliation: Electr. Res. & Dev. Assoc., Vadodara, India (Patel, M.J.)
Abstract	About a dozen field failures of very large (UHV) forced oil-cooled power transformers had been attributed to flow electrification of transformer oil. During the flow of hydrocarbon insulating oil through cellulosic insulation ducts in transformer, charge separation occurs at the interface of cellulose and oil. The negative ions accumulated on the cellulose may lead to dielectric breakdown in oil or at the interface. Considerable work is being done on this subject since last one decade. Now research activities are focused broadly on three fronts. First on standardization of measurement techniques, identification of affecting parameters and finally suppression up to safe limit. Most of the studies done so far have been on naphthanic based transformer oil. In this study an attempt has been made to evaluate paraffinic based transformer oil and study the effect of different parameters' e.g., type and quantity of paper, mounting position of paper, etc. on charge density. Although not much significance is given to electrical resistivity of oil in various international specifications, an interesting relationship is observed here with charge density. Mitigation of charge density by adding BTA (Benzotriazol) and LAB (Linear alkyl benzene) is found satisfactory without affecting oil characteristics.
Starting Page	648
Ending Page	651
File Size	514654
Page Count	4
File Format	PDF
ISBN	078034927X
ISSN	1089084X
DOI	10.1109/ELINSL.1998.694876
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-06-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Oil insulation Petroleum Power transformer insulation Power transformers Dielectrics and electrical insulation Hydrocarbons Ducts Dielectric breakdown Standardization Measurement techniques
Content Type	Text
Resource Type	Article

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