Transformer Paper Degradation
Transformer Paper Degradation
(OP)
Following on from our annual DGA sampling of our network transformers, one transformer has come back with increased levels of Furfuraldehyde which indicates degradation of the paper insulation. This has been put down to increased winding temperature, we have reduced the load to lower the temperature. The company who did the oil analysis has then estimated the Degree of Polymerization to be 254, this is indicating the transformer has reached the end of its useful life as there is no mechanical strength left in the paper. They say that the transformer could fail if subjected to a short circuit or other mechanical stress, which I agree with. My question is that my boss would like to have further testing done on this transformer before deciding to replace, however I am doubtful anyhing can be done. Please advise if you know of anything that can be done and who by. The problem I can see is that we are questioning the mechanical strength not the electrical strenght of the papers. Taking paper samples for analysis would be a last resort for us.
Thanks in advance
Seanmcc






RE: Transformer Paper Degradation
However, one test results should not be the final criterion. Contact firms that have a good record of transformer replacement recommendations. In some cases, the transformer manufacturer knows the best.
RE: Transformer Paper Degradation
http://www.thomasregister.com
and type Transformer Services under Product or Service, which will return 5 companies to approach to
RE: Transformer Paper Degradation
RE: Transformer Paper Degradation
RE: Transformer Paper Degradation
You might want to contact established and experienced test labs like www.actiinc.com or www.oliveoilsource.com or www.tjh2b.com
RE: Transformer Paper Degradation
Who knows, it may last a lot longer or may not. You need to ask yourself if you want a forced outage for replacement or a scheduled outage.
RE: Transformer Paper Degradation
RE: Transformer Paper Degradation
http://www.powertech.bc.ca/cfm/index.cfm?It=901&Id=60
for: Screening Insulating Oils for Paper Degradation Products (2-Furaldehyde)
Notice that a deliberate transformer overloading might reveal the transformer situation, whether it is about to fail (it will fail) or function for some longer time
http://www.ias.ac.in/resonance/June2003/pdf/June2003p17-23.pdf
for:
Correlation Between 2-Furaldehyde and DPv graph
etc. for more info
It may be a good idea to place the original posting in Chemical Engineers section of this Forum since the topic is much too much on the chemical side as may be evidenced in the posted links.