The work on faults and failures in a power transformer, which is of significance in understanding results from the Dissolved Gas Analysis (DGA) and condition assessment measurements? This technical case study paper discusses the advantages of online DGA. The first study describes the various reasons behind the failure of power transformers with examples. The review will also be useful for effective prevention of power transformer failures, with comparative analysis. Then the paper presents how the developing failures could be saved through a continual Transformer Asset Health Review by effective DGA analysis combined with effective condition assessment. Furthermore, the study reveals the need for computations of core (Ro and Xo) and winding equivalent parameters (Ro2 and Xo2). It also proposes an equation reduction technique in the procedure of open circuit and short circuit tests of transformers, which are useful in computing winding and core parameters, respectively.
Mr. Hemadrasa although i do not have a direct answer to your question i would suggest these 2 useful technical reports on Power Transformer life span
http://www.dynamicelec.com/zlargefilespdf/Transformer%20Life%20Expectancy.pdf
https://www.escholar.manchester.ac.uk/uk-ac-man-scw:187566
A transformer is considered to be at the end of its service life when the insulation particularly the paper insulation around its windings is deteriorated. The extent of deterioration depends on how 'hard' the transformer has been used over its lifetime - ie. how long it has been run above its maximum rating.
The short circuit and open circuit tests validate electrical design parameters and cannot be a predictor of the service conditions of the transformer!
Thank you Mr Naeil,
First Conduct maximum rating test for Voc and Isc from the begining i.e ZEROTH YEAR
Second after appoximately 25 % of life span and then 75% life span of the same trans former.
Finally, with these compartive data can we predict remaining life span of the the TRANSFORMER.
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