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Estimation of water content in a power transformer using moisture dynamic measurement of its oil

Content Provider	IET Digital Library
Author	Sarfi, Vahid Mohajeryami, Saeed Majzoobi, Alireza
Abstract	Careful monitoring of high voltage equipments and diagnosing the critical conditions before they lead to a disaster are prerequisites of condition-based maintenance. Moisture content in a transformer is regarded as one of the major factors in diagnosing its conditions. It causes many problems for a power transformer including electrical breakdown between either its windings or one winding with neutral, increase in the amount of partial discharge and sundry minor problems. Since paper insulation of a power transformer carries large portion of water content, determining moisture content in this part of the transformer is essential. However, the problem is that the direct measurement of moisture in paper is impossible. Therefore, various methods have been proposed to measure the moisture content in a transformer but each one has its limitations. In this study, an approach is introduced to measure water content in a transformer by analysing the moisture dynamics in oil, tracking its variations and analysis of parameters such as temperature, without necessity of disconnecting the transformer from the power grid.
Starting Page	11
Ending Page	16
Page Count	6
Volume Number	2
e-ISSN	23977264
Issue Number	Issue 1, Mar (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/hve/2/1
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/hve.2016.0075
Journal	High Voltage
Publisher	The Institution of Engineering and Technology CEPRI
Publisher Date	2017-03-01
Access Restriction	Open
Rights License	Creative Commons Attribution License(http://creativecommons.org/licenses/by/3.0/)
Subject Keyword	Condition-based Maintenance Dielectric Breakdown And Discharges Direct Moisture Measurement Electric Breakdown Electrical Breakdown High Voltage Equipment Monitoring Humidity Measurement Moisture Dynamic Measurement Moisture Dynamics Analysis Moisture Measurement Organic Insulation Paper Paper Insulation Partial Discharge Partial Discharges Power Grid Power Transformer Power Transformer Insulation Sundry Minor Problem Transformer And Reactors Transformer Oil Transformer Windings Water Content Estimation
Content Type	Text
Resource Type	Article

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