Dry Type Transformer Life Assessment

[Shark96]

Hello. I have a few dry type transformers installed at the power plant where I work rated up to 2500 kVA. The transformers have been in service since the late 90s. What are some techniques that can be utilized for remaining life assessment of these transformers? Any advice would be appreciated. Thanks.

 

[7anoter4]

See:
IEEE Std C57.96-1999 IEEE Guide for Loading Dry-Type Distribution and Power Transformers chapter 6. Basis for calculations of temperatures, loss of life, and loads.
IEC 60076-12/2008 Power Transformers part 12 Loading guide for dry-type power transformers. chapter 5. Ageing and transformer insulation life time

 

[thermionic1]

Hire a service / testing company that has a service agreement with Doble Engineering and ask for a Doble Power Factor Test. On smaller units like yours, the testing doesn't take too long. A Doble service agreement will allow your test results to be compared to a database of similar units and some kind of evaluation made. The service company can also perform maintenance on the unit, test fan / alarm operation and other tasks.