Determination of the thermal aging factor for life expectancy of 550 kV transformers with a preventive test

It is feasible to survey actual performances of degradation for 550 kV transformers by a preventive test. By means of condition monitoring, it is possible to forecast the transformers' lifetime. Such data, particularly in an application where few or no failures are expected, can provide conside...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2013-12, Vol.20 (6), p.1984-1991
Main Authors: Xiang Zhang, Gockenbach, Ernst
Format: Article
Language:English
Subjects:
Accelerated life tests
Aging
Aging factor
Alloys
degradation
Intermetallic compounds
large power transformer
least-squares fitting
life model
Mathematical model
Oil insulation
parameter
Power transformer insulation
preventive test
probability plot
temperature
Temperature measurement
Thermal factors
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Summary:It is feasible to survey actual performances of degradation for 550 kV transformers by a preventive test. By means of condition monitoring, it is possible to forecast the transformers' lifetime. Such data, particularly in an application where few or no failures are expected, can provide considerably more information than the failure-time data from a traditional accelerated life test. In order to develop a life model for 550 kV transformers, the effect of temperature on a thermal aging factor is taken into account since it is associated with various degradation performances of a transformer. With the aid of measurement, the thermal aging factor is analysed by the probability plot and the least-squares fitting of data so that all unknown parameters of the life model are estimated. The method will extrapolate the lifetime of large power transformers from a preventive test in practice.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2013.6678845