Cast resin transformers provide several advantages over oil-filled transformers including being non-flammable, fire safe, and maintenance free as they do not use liquids. They also have high overload capability and can operate using only air cooling. While cast resin transformers have a larger physical size and initially higher purchase cost than oil transformers, they are increasingly used where safety, environmental protection, space, and overall life cycle costs are primary concerns.

1.  Name: Bidusmita Sahoo
Regn no: 0901106016
Branch: Electrical Engineering
 Submitted to:
Mr. Abhimanyu Mohapatra
Mr. Ranjan Kumar Jena

2. CONTENTS
 Introduction
 What is cast resin process ?
 Why cast resin transformer ?
 Construction
 Types of tests on resin transformer
 Overload capability
 Comparison with oil-filled transformer
 Applications
 Manufacturers
 Conclusion

17. 1.Set fire to the winding 2.ext paint caught fire 3.Self-extinguished 4.No damage
◆ Fire Testing:
Test result: Non-flammable
◆ Cracking I Damp Heat Testing:
Test result: Appearance normal, no damage, non-cracking.
Technical characteristics remain unchanged.

20. OVERLOAD When the temperature of the cooling air is
lower than the limit allowed for the insulation class of the
windings, the output power of the transformer can be
higher than the nominal one. On the other hand by
reducing the value of the selected power relative to the
nominal one, the transformer can also be used without any
problems with higher air temperature like for example
those in tropical climates. The graph shows the curve
which indicates the power to be selected as a function of
the air temperature.

22. ADVANTAGES OF CAST RESIN
TRANSFORMERS
1.Non-hygroscopic insulation
2.Fire safety
3.High Mechanical strength
4.No leakage of liquids
5.Maintenance free & environmentally safe
6.High overloading capability
7.Only needs air cooling
8.Impulse voltage strength
9.Less failure rate

23. DISADVANTAGES OF CAST RESIN
TRANSFORMERS
1.Larger physical size
2.Initially high purchase cost

26. MANUFACTURERS
 ABB International Limited
 BHEL
 Siemens
 Alstom

27. CONCLUSION
Cast Resin transformer is used where
safety, pollution, size & economy matters a lot.
Now-a-days the use of Cast resin transformers has
been increased and they are widely used in power
houses, Apartments, as back-up supply, etc. These
are
very
commonly
used
in
China, Japan, USA, Switzerland, Netherland. But
these are very rarely used in India. According to
my view Energy Department of India should think
about the installation of these transformers in our
Power System.