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Temperature rise in Power Transformer

  1. Oct 22, 2009 #1
    The following transformer gets overheated and I was looking for most probable the causes associated with it.

    1. Rating : 7.5 MVA, 0.85 power factor, Power Transformer (Manufacturer - Kirloskar)
    2. Connected Load : Upto 6 MW
    3. Oil Natural Cooling System
    4. Normal Atmospheric Temperature : 25 C
    5. Clauses : The transformer performs well most of the times and at peak load that occurs mostly at 0600 hrs and 1800-2100 hrs. However, on a hot day the temperature of the transformer exceeds the permissible limits. The reading are as follows: Oil Temperature : 50 C, Winding Temperature : 73 C. The connected load at this time was noted to be upto 4 MW and the atmospheric temperature was noted to be about 30 C. This should, practically, never cause the transformer to overheat.
    6. Observation : The transformer's vent-pipe seemed to be missing, or perhaps this transformer never used one. Also, this is a pretty new transformer, installed in 2001.
    7. My assessment : I thought that the dielectric strength of the oil has deteriorated and/or sludge formation within the tank has occurred. I am planning to filter the oil in the tank.

    What are your recommendations/feedback?
     
  2. jcsd
  3. Oct 22, 2009 #2

    russ_watters

    User Avatar

    Staff: Mentor

    This is too expensive of a problem to trust to a message board. Hire an engineer to evaluate the transformer. He'll want to physically examine the transformer and read the submittal information.
     
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