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THERMOSYPHON FOR POWER TRANSFORMER
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, etc.
DEMAND
Transformer
manufacturers should incorporate this device in the present transformer to
increase the life of the transformer oil before supplying the same to
Electricity Board, Railways, NTPC, etc.
PRESENT STATUS OF THE
TECHNOLOGY IN THE COUNTRY
Only few major
transformer manufacturers are aware about the thermosyphon system. However due
to lack of feed back from users, performance of existing system is not known.
Manufacturers have desired that data pertaining to :
Usefulness of
thermosyphon,
specification
and quantity of absorbent,
maintenance
schedule,
selection of
suitable design and clarifications about dissolution of absorbent should be
made available to them.
TECHNOLOGY DEVELOPED AT
Electrical
Research & Development Association,
Makarpura Road,
Vadodara-390010
(A Dept. of
Science & Technology Sponsored Project)
WORK DONE AT THE
RESEARCH INSTITUTE
The Research
Institute has identified suitable absorbents, their specification, quantity,
maintenance schedules and optimised an appropriate design of fixture. Institute
has also studied various parameters which can affect performance of
thermosyphon..
Study was
carried out on an actual transformer with indigenous materials. Results
indicates that acidity of oil and moisture content has reduced in comparison to
transformer without thermosyphon. Transformer oil has been tested as per IS:
1866-1983 for comparison purpose.
EQUIPMENTS REQUIRED TO
FABRICATE THE DEVICE
No special
equipment is required for fabrication of this device. Any transformer
manufacturer having basic fabricating facilities can manufacture the same
without any additional investment.
RAW MATERIALS REQUIRED
All the
raw-materials required for fabrication of the device and consumables are
available indigenously.
COST OF CONSUMABLE
Not significant
in comparison to gain achieved.
TECHNO ECONOMICS OF THE
DEVICE
·
It does not require shutdown of the transformer for routine
maintenance.
·
Life of transformer oil including insulation of the windings
increases.
·
Reduces cost incurred on frequent filtration of transformer oil.
For example a power transformer having 20 K litre transformer oil (1MVA rating)
the life of the transformer oil is 25 years; by mounting thermosyphon life
increases by 5 more years without any significant additional cost. Total saving
could be around Rs.1.5 lakhs against cost of thermosyphon Rs.10,000/- to
Rs.50,000/- apart from saving from shut down, filtration etc.
NOTE:
For
incorporating thermosyphon in the transformer no special changes are required
in the existing design. The cost of thermosyphon unit for 100 KV transformer is
about Rs.1000-1500/-.
NRDC
National
Research Development Corporation, a Government of India Enterprise, is a
premier technology transfer Corporation with four decades of experience. It has
helped establish over one thousand projects in the small and medium scale
sector. The supply of technologies and services to entrepreneurs extend both in
the developing and developed countries like USA, Germany, Malaysia, Burma,
Nepal, Senegal, Madagascar, Indonesia Philippines, Vietnam, Lanka, Kenya,
Brazil, Bangladesh and Egypt.
Advantages of Indian
technologies:
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