DGA H2 concentration
DGA H2 concentration
(OP)
Is posible to have a high concentration of C2H2 (70-90)and almost zero H2 concentration?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: DGA H2 concentration
wbd
RE: DGA H2 concentration
Of course you know normally we think acetylene comes only from arcing and is accompanied by hydrogen (the simple key gas profile). I don't ever remember seeing acetylene without hydrogen off-hand.
You may have seen Halstead's theoretical curve Fig 1 of IEEEC57.104-1991 which shows that decomposition of oil produces hydrogen starting at lowest temperatures of any of the gases and hydrogen level increases from 225C to 1800C (the limits of the graph). But I have never placed too much faith in that curve.
hydrogen gas will leave the oil for the gas space much easier. So if it has been a long time since the fault you may find some of the hydrogen has gone to the gas space. But also if some of gas from your sample is lost during transport/analysis prior to vacuum extraction, that gas would likely be mostly hydrogen, since hydrogen comes out first.
RE: DGA H2 concentration
I sugesst to sample with glass syringes