CAST RESIN TRANSFORMER

Name: Bidusmita Sahoo

Regn no: 0901106016

Branch: Electrical Engineering

Submitted to:

Mr. Abhimanyu Mohapatra

Mr. Ranjan Kumar Jena

CONTENTSIntroductionWhat is cast resin process ?Why cast resin transformer ?ConstructionTypes of tests on resin transformerOverload capabilityComparison with oil-filled transformerApplicationsManufacturersConclusion

INTRODUCTION

WHAT IS CAST RESIN PROCESS?

DYNAGRID PRINCIPLE

WHY CAST RESIN TRANSFORMER?

MAGNETIC CORE

CORE LAMINATION

WINDINGS

STRUCTURAL ELEMENTS

RADIAL COOLING FANS FOR AF COOLING

TYPE OF TESTS ON RESIN TRANSFORMER

FLAMMABILITY TEST

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.

ROUTINE TEST

OVER LOAD CAPABILITY

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.

COMPARISION WITH OIL FILLED TRANSFORMER

ADVANTAGES OF CAST RESIN TRANSFORMERS

1.Non-hygroscopic insulation2.Fire safety3.High Mechanical strength4.No leakage of liquids5.Maintenance free & environmentally safe6.High overloading capability7.Only needs air cooling8.Impulse voltage strength9.Less failure rate

DISADVANTAGES OF CAST RESIN TRANSFORMERS

1.Larger physical size2.Initially high purchase cost

APPLICATION

More than 10,000 units in service.Statistics show reliability evenbetter than oil transformers.

MANUFACTURERS

ABB International LimitedBHELSiemensAlstom

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.