NDLI: Improvements of the transformer insulation XY model including effect of contamination

Content Provider	IEEE Xplore Digital Library
Author	Jialu Cheng Werelius, P. Robalino, D. Ohlen, M.
Copyright Year	2012
Description	Author affiliation: Megger Täby, Sweden (Jialu Cheng; Robalino, D.; Ohlen, M.) \|\| Megger Dallas, USA (Werelius, P.)
Abstract	Dielectric Frequency Response, DFR (also known as Frequency Domain Spectroscopy, FDS), was introduced more than 20 years ago and has been thoroughly evaluated and proven in a number of research projects and field tests with good results. DFR data in combination with mathematical modeling of the oil-paper insulation is proven as an excellent tool for understanding insulation properties e.g. moisture content in cellulose insulation and temperature dependence of the insulation system. The model used to describe the insulation system inside transformers and bushings is called an XY-model. The model works well for most transformers but there are sometimes measurements showing an irregular response and not the expected shape for oil-paper insulation. In those cases, the moisture analysis becomes more difficult and sometimes almost impossible. One example is “frequency hump” phenomena sometimes observed in DFR measurements. A model of the internal creep currents from e.g. contamination has been developed and by applying it in moisture assessment software, better interpretation is obtained. Simulations are complemented with measurements on an actual XY-cell with a conductive layer on the surface of the insulation. Results support the simulation model.
Starting Page	169
Ending Page	174
File Size	1113730
Page Count	6
File Format	PDF
ISBN	9781467304887
ISSN	1089084X
e-ISBN	9781467304870
e-ISBN	9781467304863
DOI	10.1109/ELINSL.2012.6251451
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-10
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Contamination Permittivity Conductivity Insulation Mathematical model Finite element methods Power transformers contamination cellulose DFR dielectric frequency response FEM insulation modeling power transformer
Content Type	Text
Resource Type	Article

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