Dry Vs Oil Type Transformer - 1250KVA PDF [PDF]

Citation preview

CAST RESIN DRY TYPE VS OIL TYPE TRANSFORMERS



S. No.



Specification



Description Cast Resin Dry Type Transformer



Oil Type Transformer



Lesser. Cost Saving Better Payback of Equipment Cost



Higher Operational Cost



Lighter



Heavier



Compact Size. Need lesser spaces & clearances as per IEC standards



Large Footprints. Need more spaces & clearances



Yes. Due to placement very close to load center



More cables & BTD cost due to separate / isolated trafo room



1



Load Losses



2



Weight



3



Space Requirements



4



Cost Saving in Cables/BTD



5



Installation Cost



Lesser



More cost due to heavy weight, large sizes & oil filling



6



Installation Time



Quick Installation. Easy to install



Complex (specially in case of oil filling at site for large size transformers)



7



Chance of Failure



Minimum



More due to oil leakage or Buchholz relay failure



9



Maintenance Frequency



Very Low



Higher than dry type. (Dehydration required)



10



Maintenance Cost



Low



High



11



Temperature Withstand Capability



Insulation in dry type transformers can withstand higher temperatures



More heat is generated in oil type transformers



12



Moisture & Contamination



Resistance to Moisture & Contamination



More Chances of Moisture & Contamination due to oil