NDLI: Electrical conductivity measurement and determination of ion mobility in insulating oil

Content Provider	IEEE Xplore Digital Library
Author	Vahidi, F. Jovalekic, M. Tenbohlen, S. Rosner, M. Perrier, C. Fink, H.
Copyright Year	2013
Description	Author affiliation: Univ. of Stuttgart, Stuttgart, Germany (Vahidi, F.; Jovalekic, M.; Tenbohlen, S.) \|\| Alstom Grid, Monchengladbach, Germany (Rosner, M.; Perrier, C.; Fink, H.)
Abstract	The insulation system of power transformers is a key topic which has to be taken into account in order to achieve an optimized design and safe longterm operation. The design of feasible insulation for high voltage direct current transformers requires the understanding of field distributions in insulating materials in both AC and DC operation because the transient stresses are dependent on both conductivities and permittivities and geometry. The steady state DC field stresses are determined by conductivity of insulating material which is normally a combination of oil and paper. Therefore knowledge about the conductivity of the oil is of great importance for design and safe operation in DC case. Moreover the space and surface charges will occur in field space and also will influence the electric field. If such charges are present in a noteworthy amount, models depending on material properties only will probably be an approximation. The conductivity of insulating material is dependent on several parameters, e.g. time, temperature and electrical field strength and the geometry of the arrangement. In this contribution, a new measuring cell with plate type electrodes is presented for analysis of oil conductivity. The measurement accuracy of the set-up is investigated both analytically and experimentally. Consequently, measurements are performed for investigating the time behavior of conductivity. The results show that the determination of ion mobility using polarity reversal test represents to a suitable approach to investigate the transit times more precisely.
Sponsorship	IEEE Dielectr. Electr. Insul. Soc.
Starting Page	313
Ending Page	317
File Size	464791
Page Count	5
File Format	PDF
ISBN	9781467347389
e-ISBN	9781467347440
e-ISBN	9781467347396
DOI	10.1109/EIC.2013.6554257
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-02
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Conductivity Current measurement Conductivity measurement Temperature measurement Voltage measurement Pollution measurement Electrodes Transformer oil Transformer insulation electrical conductivity HVDC transmission transit time
Content Type	Text
Resource Type	Article

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