To reduce the voltage drop

To increase the output voltage

To reduce the no of transformer

Provides more reliability of power

Phase sequence must be same

Type must be same

Polarity must be same

Capacity must be same

Transform 3 phase to 2 phase

To stabilize the output voltage

To get rated power output

Transform 3 phase to 6 phase

Natural air method

Oil blast method

Air blast method

Forced circulation of oil

To improve the efficiency

To protect the winding from damage

To regulate the voltage

To increase the life of transformer oil