A query about Dissolved Gas Analysis

[Darrent]

Hi there, I wondering if is normal that a transformer shows decreasing values of DGA, we do analysis yearly. We got these numbers:

GAS 2014 2015 2016 H2 13231 21226 17424 H2O 5 20 21 CO2 25152 28936 24104

Thanks a lot beforehand. Regards

 

[wbdvt]

It has been awhile since I have been involved in DGA but I believe the oil temperature plays a part in how much gas is in the oil. I doubt that all the samples had the same oil temperature. I would be more concerned with the water in oil amounts. Is pressure being maintained in the transformer?

 

[Bugman1400]

There is a lot of info missing. Some of the question I have are:

1.) Is this xfmr new in 2014?
2.) What were the values on the test report at the manufacturer?
3.) Has the oil been dried or filtered?
4.) What are the units of measurement for the values you've given (ie ppm)?
5.) What is the size an voltage of the xfmr?
6.) Is this xfmr in El Salvador where its humid and the water count would be higher than say in Arizona, US?