Journal ArticleDOI
Moisture Equilibrium Charts for Transformer Insulation Drying Practice
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In this paper, a set of moisture equilibrium charts applicable to transformer insulation is presented, which may be used for the estimation of dryness levels in transformer insulation during the preparative and operational stages, and also during storage.Abstract:
A set of moisture equilibrium charts applicable to transformer insulation is presented. These may be used for the estimation of dryness levels in transformer insulation during the preparative and operational stages, and also during storage. A critique on the well known Piper chart is provided. Techniques to construct equilibrium curves for the combined paper-oil system from indirect measurements are outlined, and the interpretation of these curves for practical situations is discussed.read more
Citations
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Journal ArticleDOI
Applications of dielectric spectroscopy in time and frequency domain for HV power equipment
TL;DR: In this article, the authors proposed an off-line, on-site insulation condition assessment of HV electric power equipment and its predictive maintenance using dielectric spectroscopy in the time or frequency domain.
Journal ArticleDOI
Moisture equilibrium in transformer paper-oil systems
TL;DR: The authors provides an overview of the classic moisture equilibrium curves and their history and provides useful information on the relationships among them and their validity, as well as their relationship among different types of equilibrium curves.
Journal ArticleDOI
50 years in the development of insulating liquids
TL;DR: The role of electrical insulation is critical for the proper operation of electrical equipment and it is therefore essential to dissipate the heat generated by the energy losses, especially under high load conditions.
Journal ArticleDOI
Cellulose insulation in oil-filled power transformers: part II maintaining insulation integrity and life
T.V. Oommen,T.A. Prevost +1 more
TL;DR: In this paper, the practical aspects of the usage of cellulose insulation in transformers with regard to maintaining the integrity over long periods of time and preserving and extending insulation life are examined and life plots are discussed in more detail.
Journal ArticleDOI
A comparative study of physicochemical, dielectric and thermal properties of pressboard insulation impregnated with natural ester and mineral oil
TL;DR: In this article, a comparative study of physicochemical, ac breakdown strength and thermal stability behavior of BIOTEMP natural ester/pressboard insulation and Karamay 25# naphthenic mineral oil/press board insulation after long term thermal ageing was conducted.
References
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Proceedings ArticleDOI
Moisture equilibrium in paper-oil insulation systems
TL;DR: In this article, the relationship between the water content of the paper and of the oil is used to predict the changes in temperature of power transformers with a paper-oil insulating system, and the isotherms are obtained experimentally or more easily by combining known absorption curves for paper and oil.
Journal ArticleDOI
25—the sorption of water by cellulose and eight other textile polymers
TL;DR: In this article, the authors discuss the use of water by cellulose and eight other textile polymers to solve the problem of deterministic deterministic water polarity.
Journal ArticleDOI
Moisture Equilibrium Between Gas Space and Fibrous Materials in Enclosed Electric Equipment
TL;DR: In this article, an inert gas medium is used to provide an inert medium by which the pressure at the surface of the transformer fluid is kept slightly above atmospheric, and the fluid is not exposed to the moisture and oxygen of the air, as it is with the so-called open-breather or oil-conservator types unless the latter communicate with the outside atmosphere through chemical agents.