Recent content by setiawanmarten

Dear all, We just test transfomer 3000 KVA , primer 20.000 V and secunder 90 V. We test the winding insulation resistance : P to ground (with secunder Short to Ground) result : 13.200 MegOhm S to ground (with primer short to ground) result ...

Electricpete...actualy the h2 value was 0 and the c2h2 was 312 ppm..so this is possible that the fault is from the past?

Dear all, Is it possible to get dga result with high c2h2 but low h2? Thank you

Winding resistance can be done but only for primer because the secunder the resistance was so low that the winding resistance could not be measured....by the way this is a rectifier transformer

And is it possible to have a short circuit in winding without c2h2 present in the dga result?

Smallgreek, yes it phase r s t , zog zog thank you, 7anoter 4 is it not possible the problem in the tap changer connection or lead ?

Just doing TTR and the result was 52.672 ; 46.891 ; 50.217 is this confirm that the problem is in the connection?

Prc, the co actualy went up from 280 ppm to 390 ppm in ten days, but still near standar 350 for CO

DanDel, how to confirm the partial discharge in the winding? If the winding have partial discharge is that mean we have to rewind the transformer?

Scotty, we already done a few times dga and the increase was 32 ppm per day

Dear all, I have this problem with my dga result on tranformer 6545 kva 11 kv to 254 v , co 390, co2 3663, ch4 482, c2h2 0, c2h4 560, c2h6 224, h2 2361 , tdcg 4031, according to duval said thermal fault over 700 deg c..what should i do with this transformer?

Thank you dandel

Dear all, I have this transformer 6000 kva , primer 11.000 v , sec 245 v, teh dga result was indicating high h2, i am planning to do polarization index, is it save to inject 500v dc to secunder for 10 minutes for pi test the secunder? (twice the nominal rating of the secundr)From the standard...