DocumentCode :
2044583
Title :
A survey of developments in insulation monitoring of power transformers
Author :
Ward, Barry H. ; Lindgren, Stan
Author_Institution :
EPRI, Palo Alto, CA, USA
fYear :
2000
fDate :
2000
Firstpage :
141
Lastpage :
147
Abstract :
The aging infrastructure of large GSU and EHV power transformers built in the `60s and `70s poses a serious strategic issue for users worldwide. Catastrophic failures are escalating both in number and cost including environmental impacts. Extension of the useful life of power transformers is the single most important strategy for extending the life of power transmission and distribution infrastructures starting with the GSU at the power plant itself. Continuous assessment of transformer operating condition, accomplished through on-line monitoring, off-line diagnostic tests, and expert system diagnostic and analysis modules, existing and under development, are examples of the practical implementation of that strategy. For example, on-line gas analysis, including oxygen and moisture, offers the potential for gaining a much better understanding and assessment of the dynamic operating condition of such transformers than is possible through periodic laboratory dissolved gas analysis (DGA) tests. However, field experience and learning are vital in order to understand more fully the dynamic relationship between on-line gas analysis and the changing condition of the transformer insulation structure under all operating conditions. This paper presents a survey of new monitoring and diagnostic technologies and applications, including laboratory experimental work, in power transformer insulation monitoring for the purpose of condition assessment
Keywords :
chemical analysis; condition monitoring; diagnostic expert systems; fuzzy logic; insulation testing; moisture measurement; partial discharge measurement; power engineering computing; power transformer insulation; reviews; PD detection; UHF sensors; acoustic sensors; aging infrastructure; catastrophic failures; condition monitoring; continuous assessment; dielectric monitoring; environmental impacts; expert system diagnostic modules; expert system diagnostic software; field experience; fuzzy logic identification; insulation monitoring; moisture analysis; off-line diagnostic tests; on-line gas analysis; on-line monitoring; power transformers; predictive maintenance; transfer function analysis; transformer operating condition; useful life extension; Aging; Condition monitoring; Costs; Dissolved gas analysis; Laboratories; Power generation; Power transformer insulation; Power transformers; Power transmission; System testing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Insulation, 2000. Conference Record of the 2000 IEEE International Symposium on
Conference_Location :
Anaheim, CA
ISSN :
1089-084X
Print_ISBN :
0-7803-5931-3
Type :
conf
DOI :
10.1109/ELINSL.2000.845477
Filename :
845477
Link To Document :
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