Thermography of Transformers
Thermography of Transformers
(OP)
Is Thermography of Transformers a Standard practice in the Preventive Maintenance of Transformers.
IT is good to do thermography but in any standard for transformer PM is it mentioned to do thermography.
IT is good to do thermography but in any standard for transformer PM is it mentioned to do thermography.






RE: Thermography of Transformers
It has been interesting to observe transformer radiator banks and the temperature differential among banks and from top to bottom of a bank.
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If we learn from our mistakes I'm getting a great education!
RE: Thermography of Transformers
Rafiq Bulsara
http://www.srengineersct.com
RE: Thermography of Transformers
old field guy
RE: Thermography of Transformers
But yes they can surely say that it is part of Condition Monitoring of Transformers
RE: Thermography of Transformers
RE: Thermography of Transformers
Rafiq Bulsara
http://www.srengineersct.com
RE: Thermography of Transformers
1)C62-1995 Diagnostic Field Testing of transformers
2)C57.140-2006 Evaluation and recondition of transformers.
Eventhough these standards cover thermography, they are not covering the periodicity of this test.Most critical area for thermography in large transformers is the terminal connections of bushings to outside.For large critical units I would recommend once a year this test.
RE: Thermography of Transformers
Loose connection on CT lead in control box.
Broken valve indicator on radiator. Valve was closed = radiator off line.
Overloaded bushing CT. Metering had been added above the rated burden.
Contaminated bushing with leakage current.
It didn't take but a few minutes more in the annual plant thermography survey to look at these transformers. There was not a special trip to a transfomer site just to do thermography.
RE: Thermography of Transformers
I think opeing cover for live parts of Transformer is not recommended.
Does any body know good lietrature on Transformer Thermography.
Thanks in advance,
RE: Thermography of Transformers
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If we learn from our mistakes I'm getting a great education!
RE: Thermography of Transformers
Another common thing you may see is hot spots under the isophase bus on the tank wall and aorund the GSU low-side bushings enclosures due to circulating currents. Those are probably chronic condition without easy fix - require careful evaluation.
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RE: Thermography of Transformers