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when the alarm comes we vent the BUCHHOLZ then the alarm reset for three to 5 times during the low temp period.

in fact we checked the conservator tank trere is only the level indicator connected to the bottom of the air cell,currently we stop some cooling fans at low load to maintain oil temperature above 45C not to get BUCHOOLZ alarm.

in steam turbines 364MW Units equipped with electronic main and back up over speed protection system ,how often should we perform real over speed test.

we removed the silica gel from the breather and today early morning again alarm. the level scale on the conservator tank showing 50 to 60 % which i believe the level of the air bag inside the conservator.is it ok to operate without silica gel for one day for test? we always operate at this...

Thanks PRC, i would like to give some data about our transformer, it is equiped by 7 pumps and 7 horizintal coolers located above the transformer, the conservator tank contains air bag connected to the silical breather, yesterday we noticed one of the coolers dropping very little oil, we...

HI PRC, we removed the oil cup at the inlet of the silica gel breather and replace the oil there was nothing abnormal,how can we check if the breather is blocked?

thanks alot , i am going to check it now, the conservator tank is equiped with air bag connected to the silicaal breather. fyi we used to vent the BUCHHLOZ we we get the first alarm then it dissapear and no trip happens.if we did not vent it with the first alarm, is it going to trip after...

here are the DGA before one year Gas ppm H2 8 O2 18987 N2 82141 CO2 2488 C2H4 Ethylene 10 C2H6 Ethane 47 C2H2 Acetylene 0 C3H8 & C3H6 Propane & Propene 46 CH4 Methane...

Thanks for your good reply, i could sea during the alarm time air bubles crossing the BUCHLOZ sight glass towards the conservator tank, soon i will let you know DGA last year results. i think the conservator is higher than the BUCHLOZ, the level of the conservator is from 50 to 60%. we checked...

in 400 MVA transformer we get every night first stage alarm at , we noticed that the alarm comes when the ambient temperature is low and unit load is low. we susbect air ingress during low temperature time when both oil and air temperature are at thier lowest value. we performed DGA for the oil...