Traces of Ethane C2H4 & Acetylen C2H2 in new / not yet energized transformer .
Traces of Ethane C2H4 & Acetylen C2H2 in new / not yet energized transformer .
(OP)
We have three transformers kept at site for more than 3 years not energised and when DGA samples taken we noticed traces of Ethane C2H4 ( 117 ppm ) & Acetylene C2H2 ( 3 ppm ) , what cloud be the reasons ? any risk to energise transformers ? is it necessary to change oil ? We are thinking to energise and monitor and take another DGA samples after 2 weeks any risk ?






RE: Traces of Ethane C2H4 & Acetylen C2H2 in new / not yet energized transformer .
Any way before energistaion,important to check BDV and water content of oil, hot oil filtertaion at leasy for 3 days, checking water ppm at the end of filteration by taking hot oil sample.
RE: Traces of Ethane C2H4 & Acetylen C2H2 in new / not yet energized transformer .
RE: Traces of Ethane C2H4 & Acetylen C2H2 in new / not yet energized transformer .
So if these are small transformers, it might be from the final welding.
RE: Traces of Ethane C2H4 & Acetylen C2H2 in new / not yet energized transformer .
RE: Traces of Ethane C2H4 & Acetylen C2H2 in new / not yet energized transformer .
Regarding doubt in sampling these values are after repeating sampling, we are very familiar with DGA sampling so no doubt on this subject.
The size of transformers as follows:
1. 2000 kVA 34.5 kv/480 V Sealed type transformer we found Acetylene in the three samples.
3ppm , 3ppm , 2.5 ppm
2. Other transformer rating 2500 kVA , 4.16kV/480V conservator type transformer with breather we found only Ethane C2H6 (sorry for initial mistake I mentioned in the beginning , It is not C2H4 the gas found is C2H6 )
158 ppm , 96 ppm , 117ppm
No welding done on units .
Transformers located / installed in Petrochemical company “ethylene and polyethylene plant”
Is there any possibility that this could be the reason? The gas are coming from outside environment since transformer is conservator type? If yes how we can solve this issue?
RE: Traces of Ethane C2H4 & Acetylen C2H2 in new / not yet energized transformer .
RE: Traces of Ethane C2H4 & Acetylen C2H2 in new / not yet energized transformer .
These aren't small, but also aren't big.
We have found gas in new sealed transformers, but only because they were small, and the welding to seal them was done as a last step in there manufacture. We no longer measure them as they are of low cost to replace.
Larger transformers maybe shipped empty, and vacuum filled at the site.
With these not being energized, they may have taken water, which will work on the paper.