2MVA 0.4/33kV Transformer LT Bushing Heating and Oil Leakage in Solar Application

Dear Sir, I have 2MVA 0.4/33 KV step up transformer for solar application. Its LT side bushing is continue heating and oil leakage observed. We have taken lot of actions but no result. Pl guide , what to check and what to do to stop the heating.

Hi Ranjeet
What action have you taken so far?What temperature do you consider "heating"?Where is the oil leaking from?Are any bushings cracked?Who is the transformer manufacturer?When was the transformer built?And how long between manufacturing and install-energizing?Are the bushings on top of the transformer or on the side?What is the FLA for the secondary and primary and what currents have been measured on both?What is the total solar input voltage to the transformer LT side?What is the oil level of the transformer?What is the ambient temperature generally?
RegardsAlan