NDLI: Temperature and chemical impact on determination of water content in dielectric liquids by capacitive moisture sensors

Content Provider	IEEE Xplore Digital Library
Author	Gradnik, T. Cucek, B. Koncan-Gradnik, M.
Copyright Year	2014
Description	Author affiliation: Elektroinstitut Milan Vidmar, Ljubljana, Slovenia (Gradnik, T.; Cucek, B.; Koncan-Gradnik, M.)
Abstract	Paper analyses temperature and physical-chemical factors that influence determination of water content in transformer insulating liquids by capacitive moisture sensors. Water solubility coefficients are used to calculate the water content from moisture sensor's relative saturation and temperature measurements. Absolute water content and water solubility coefficients of various types and ageing degree of mineral, ester and silicon based transformer insulating liquids were determined in controlled laboratory conditions. Results of capacitive moisture sensor measurement, the method under study, and the Karl Fisher coulometric direct titration method as the reference method, are analysed and discussed in the paper. The experimental results confirm that water solubility coefficients of the studied liquids can be basically correlated to the liquids' chemical structure. The impact of the liquid temperature and oil circulation speed on the error of the capacitive moisture sensor measurement is analysed and quantified. The paper discusses the influence of laboratory experimental conditions on determination of water solubility coefficients as well as potential error sources of water content measurements by capacitive moisture sensors in transformers in operation.
Starting Page	1
Ending Page	5
File Size	1962232
Page Count	5
File Format	PDF
ISBN	9781479920631
DOI	10.1109/ICDL.2014.6893176
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-06-29
Publisher Place	Slovenia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Moisture Liquids Laboratories Optical wavelength conversion Bismuth Manganese Silicon temperature power transformer dielectric liquid water in oil solubility relative saturation capacitive sensor water content online monitoring solubility coefficients calibration
Content Type	Text
Resource Type	Article

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