What is Thermosyphon in transformers?
Thermosyphon is an on line transformer oil filtration system
having some absorbents and mounted in the flow line of transformer
oil out side the main tank of transformer. In many industrially
advanced countries this system is frequently used for bigger
transformer of ONAN (Oil Natural Air Natural) or ONAF (Oil Natural
Air Forced) cooled. Although some Indian transformer manufacturers
are aware about it however there are some grey areas like type and
quantity of absorbent, design of thermosyphon fixture, maintenance
schedule and doubt about dissolution of absorbent with oil,
Reduces cost incurred on frequent filtration of transformer oil.
For example a power transformer having 20 K litre transformer oil
the life of the transformer oil is 25 years; by mounting
thermosyphon life increases by 5 more years without any significant