Types of Transformer
Classification of transformer on different base
A. According to construction
1. Core type transformer
In the core type transformer the coil used are form-wound and are of cylindrical type .These coils general form may be circular or oval or rectangular. A simple rectangular core is used in small size core type transformer. Which are being circular or rectangular in form. But round or circular cylindrical type coil are used in large size core type transformer.
2. Shell type transformer
In shell type transformer also the coil are form-wound .but there are multi -layer discs type usually wound in the form of pancakes. In this type transformer multi-layer discs are insulated each other by paper.
B. According to output voltage
According to output voltage there are classified in two types
1. Step-up transformer
The transformer is called step-up transformer which Secondary winding turn is greater than primary winding turn which means the transformer which output voltage is greater than input voltage is called step-up transformer .In this type transformer secondary voltage or output voltage is more as compare to primary voltage or input voltage. it is depend only on number of turns in primary winding and secondary winding .logically these relation shown in below.
But primary current is greater than secondary winding current because power become same in both circuit. When transformer work.
Secondary Winding Voltage > Primary Winding Voltage
Output Voltage > Input Voltage
Secondary Winding Turns > Primary Winding turns
Primary Winding current > Secondary Winding current
2. Step-Down transformer
The transformer is called step-down transformer which primary winding turns is greater than secondary winding turns we are called step-down transformer which primary winding number of turns is greater than secondary winding number of turns bit primary winding current is less than secondary winding current is greater than primary winding current because in both circuit power are being same ,P=V*I
Which means when voltage will increase then current will decrease.
Primary Winding Voltage > Secondary Winding Voltage
Input voltage > Output Voltage
Output current > Input Current
Secondary Winding Current > Primary Winding current.
C. According To Phase
According to phase transformer divide in two parts
1. Single phase transformer
Single phase transformer has single phase winding in primary and secondary it is work on single phase it has one phase and one neutral. It has two single phase winding primary and secondary winding. Its input and output supply is being single phase .
2. Three phase transformer
Three phase transformer has three phase winding in primary and secondary it works on three phase it has three separate winding consequently R,Y ,B.
Its input and output supply is being three phase.
In this type of transformer connected in two type of connection
Star connection ( In which produced neutral )
Transformers output depend In these both connection
D.According to service
According to service transformer also classified in two parts
1. Power Transformer
The transformer having rating above 200 kv and are used in generating station and substation for stepping up voltage is known as power transformer.
2. Distribution Transformer
The Transformer up to the power rating about 200KVA used to step down the distribution voltage stranded services voltage are known as distribution transformer.