Buchholz Relay Alarm Part 2

Please visit Buchholz Relay alarm Part 1 for previous explanation.



Other Specification are Vector group and cooling system.
Rated Power : 786 MVA at 65oC Winding Temperature
Phase : 3
Voltage : 22.8 / 525 kV
Vector Groups : YNd11
Cooling : ODAF
Tap Changer : NO-LOAD, ± 5%, 5 STEPS


Vector Combination.
The performance of a transformer largely depends upon perfection of specific turns or voltage ratio of transformer.
For do this test we must known the vector combination of transformer as explanation below.




Transformer Cooling System
ODAF or Oil Directed Air Forced Cooling of Transformer can be considered as the improved version of OFAF.

Here forced circulation of oil directed to flow through predetermined paths in transformer winding. The cool oil entering the transformer tank from cooler or radiator is passed through the winding where gaps for oil flow or pre-decided oil flowing paths between insulated conductor are provided for ensuring faster rate of heat transfer.

ODAF or Oil Directed Air Forced Cooling of Transformer is generally used in very high rating transformer.



to be continue to Buchholz Realay Work on Buchholz Relay Alarm Part 3.