Electrical / transformer

Generally there are three types of transformer 1. Step up 2. Step down 3. Auto transformer.

so you have to choose the application according to the requirement.

Instead of writing a general subject question in forum, just type transformer in google or go through the text books. Please try to use this forum for more complicated issues arised from the practical situations which can be answered by our well experienced professional members and usefull for all. However please find my contribution which is not a complete answer.

• According to USE

1. Power transformers

2.Instrument transformers

3.Current transformers

4.Potential Transformers.

• According to SIZE
1. DISTRIBUTION TRANSFORMER – Used from transferring power from a primary distribution circuit to a secondary distribution circuit according to SIZE
2. POWER TRANSFORMER – Are used for transferring power from any part of the system between the generator down to the primary distribution system according to SIZE

• According to INSULATION
1. LIQUID- IMMERSED TRANSFORMERS – Are those whose core and coils are immersed in an insulating liquid.
– Liquid can either be mineral or synthetic.
– Liquid should be non-flammable
2. DRY TYPE TRANSFORMERS – Whose core and coils are gaseous or dry compound insulating medium.
– Usually LV and MV systems

• According to LOCATION
1. INDOOR TRANSFORMERS – Is one which because of construction much be protected from weather.
– Usually dry type or non flammable oil immersed type.
2. OUTDOOR TRANSFORMERS – Is of weather resistant construction suitable for service without the additional protection from weather.
– Usually of the mineral oil immersed type.
3. STATION TYPE TRANSFORMERS – Are those designated for installation in a power station or substation.
– Usually at voltages above 34.5kV in any of the windings.
4. UNIT SUBSTATION TRANSFORMER – Is one which is mechanically and electrically and coordinated in the design with, one or more switchgear or motor
control assemblies or combination thereof.
5. CLASSIFICATIONS OF UNIT SUBSTATION TRANSFORMER
1. PRIMARY UNIT SUBSTATION – One with voltage section above 1000V
2. SECONDARY UNIT SUBSTATION – One with voltage section below 1000V.
6. NETWORK TRANSFORMERS – Is designed for use in a vault to feed a variable capacity system in interconnected secondaries

7. PAD MOUNTED TRANSFORMER – Is an outdoor type used as part of an underground distribution system.
– They are mounted on a foundation pad.
8. POLE-TYPE TRANSFORMER – Is one which is suitable for mounting on a pole or similar structure.
9. VAULT TYPE TRANSFORMER – Is constructed so as suitable for occasional submerged operation in water under specified conditions
of time and external pressure

According to cooling:-

1. air cooling

2.Fan cooling

3.oil cooling

4. water cooling

According to Winding:-

1. step up

2.Step down

3.Isolating transformer

4.Variable

5.Auto transformer

Left out a lot according to

- Frequency

- Core

...

OP should be clear exacly what he wants (or he is trying to get his homework solved here?)

- Classify transformers according to..

1- Autobots

2- decepticons