NDLI: Diagnostic testing of oil-impregnated paper insulation in prorated power transformers under accelerated stress

Content Provider	IEEE Xplore Digital Library
Author	Pradhan, M.K. Ramu, T.S.
Copyright Year	2004
Description	Author affiliation: Dept. of High Voltage Eng., Indian Inst. of Sci., Bangalore, India (Pradhan, M.K.; Ramu, T.S.)
Abstract	In the recent past, a considerable amount of work has been published on the dynamics of aging of oil impregnated paper (OIP) insulation in transformers. The insulation is always subjected to stresses of different types at the same point in time. Among the more important stress are, electrical, thermal and their combination. Insulating properties of both solid (cellulose paper) and liquid (mineral insulating oil) phases deteriorate with time due to an electrothermal process called aging. The status of insulation at a given point in time can therefore be assessed by monitoring such of those properties of insulation which are sensitive to the amount of aging, so as to be able to take and appropriate corrective measures to avoid/postpone impending insulation failure. This procedure, called diagnostic testing and condition monitoring (DTCM) aims to avoid catastrophic failure. The aim of the present investigation is to try and determine the most sensitive parameters which can serve as indices of aging and hence as a reasonably accurate indicator of possible imminent failure of apparatus insulation in service. To this end, carefully controlled laboratory aging experiments have been performed on about eight nominally identical and scaled-down models of prorated units incorporating all the essential features of actual power transformers under normal operating electric stress and accelerated thermal stress. The paper details the DTCM program designed to acquire aging data.
Starting Page	66
Ending Page	69
File Size	283785
Page Count	4
File Format	PDF
ISBN	0780384474
ISSN	1089084X
DOI	10.1109/ELINSL.2004.1380452
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-09-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Insulation testing Oil insulation Power transformer insulation Power transformers Life estimation Thermal stresses Aging Petroleum Condition monitoring Solids
Content Type	Text
Resource Type	Article

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