Transmission System

Immediately to the right of the generating station, notice the step-up transformer. This transformer system consists of the following:

B1: Breaker on supply side

B2: Breaker on the delivery side

T1: Step-up Transformer

The transformer T1 is designed to increase the power voltage from 13.8kV to 220kV. The ac power with increased voltage is fed to the transmission line which may be hundreds of miles long.

The increase in line voltage increases the transmission efficiency by reducing transmission losses.