Step up transfomer oil temperature control issue
Step up transfomer oil temperature control issue
(OP)
Dear all, on site we have a 460MVA step up transformer. It is equipped with 6 collers (air to oil, with fans and oil pump). The transformer is ODAF(oil draught, air forced). during thermography survey we found out that the part of the main oil tank that is on the part of the coolers out of service have 30 degrees temperature higher than the part of the tank where the coolers work. I think that it is not so good to have this situation. I think to make a change over on the coolers automation in order to have them grouped one by one and not three on the left and three on the right. Let me know your opinion.






RE: Step up transfomer oil temperature control issue
I think for begining, better for you, ask to xfr. factory recommendation.
Regards.
Slava
RE: Step up transfomer oil temperature control issue
The cooling of the oil is a 'top-to-bottom' motion. It is less likely the hot oil will be cooled by going 'sideways'. The cooling is less effective.
RE: Step up transfomer oil temperature control issue
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RE: Step up transfomer oil temperature control issue
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RE: Step up transfomer oil temperature control issue
We also determined that the KW consumed by the fans was less than the reduction in I2R losses in the windings due to lower winding operating temperature. So we ran all fans regardless of temperature. (This was on old rectifier transformers with a low voltage high current windings.)