NDLI: Moisture diagnostics of power transformers using dielectric response and paper samples methods

Content Provider	IEEE Xplore Digital Library
Author	Bagheri, Mehdi Naderi, Mohammad Salay
Copyright Year	2011
Description	Author affiliation: School of Electrical Engineering & Telecommunications, University of New South Wales, Sydney, NSW 2052, Australia (Bagheri, Mehdi; Naderi, Mohammad Salay)
Abstract	Transformer is one of the crucial equipments in electrical networks. Moisture in paper insulation acts as a catalyst in transformer insulation aging. It also can produce a number of dangerous reactions in a transformer. Experience has shown humidity in paper will affect electrical strength of paper insulation, degree of polymerization and aging of paper and pressboard. Thus, it is essential to find accurately the presence of moisture within paper insulation before exciting and also during operation. In this regard, chemical tests on oil have been carried out for many years. Also, electrical tests for assessing the transformer condition have been developed and improved in recent years while most developed methods aim to extract moisture from transformer paper. In this study, the results of practically applicable methods in oil sampling (KFT and capacitance sensors), paper sampling (Dean-Stark method) and also dielectric response methods (RVM, PDC, FDS) to determining paper humidity have been analyzed and compared. Crucial practical recommendations as well as advantages and disadvantages of each method are mentioned. In order to compare the abovementioned methods and come up with an accurate and reliable method for practical implementations, tests have been performed simultaneously on three distribution transformers and the results of them are discussed.
Starting Page	36
Ending Page	40
File Size	816943
Page Count	5
File Format	PDF
ISBN	9781457702785
e-ISBN	9781457702792
e-ISBN	9781457702778
DOI	10.1109/EIC.2011.5996111
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-05
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Humidity Oil insulation Power transformer insulation Insulators Humidity measurement High voltage Transformers Power apparatus
Content Type	Text
Resource Type	Article

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