transformer temperature
transformer temperature
(OP)
i have a two secondary's transformer 132/6.3/6.3 kV 60/55MVA ONAF/ONAN
at 50% loading on both secondaries, the top oil temperature is 60 C, winding 62 C, ambient 27 C.
is this considered high temperature? IEC standard says that temperature rise is 60K, 65K
at 50% loading on both secondaries, the top oil temperature is 60 C, winding 62 C, ambient 27 C.
is this considered high temperature? IEC standard says that temperature rise is 60K, 65K






RE: transformer temperature
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RE: transformer temperature
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RE: transformer temperature
RE: transformer temperature
RE: transformer temperature
IEC states that ambient temp -25 to +40 while not exceeding +30 on hottest month for air cooled trafo.
the trafo suppose to have maximum efficiency around 50% loading but the oil/wdg temp is 60/62 and the maximum is 90/95. What will be the temp in case of 80% loading?
is there a way to predict the temp at different loading points based on trafo data?
RE: transformer temperature
Yes, you are still within limits and no problem.
Ambient = 27 C
Per IEC-60076-2 allowable rise in oil = 60 C
Therefore allowable top oil temp = 27 + 60 = 87 C
Measured top oil temp = 60 C
Therefore no problem. You can load.
Similarly,
Ambient = 27 C
Per IEC 60076-2 allowable rise in wdg for ONAN/ONAF= 65 C
Therefore allowable wdg temp = 27 + 65 = 92 C
Measured wdg temp = 62 C
Therefore no problem. You can load.
Hope this helps.