Page 531 - Basic Electrical Engineering

Electricity is generated in the power house when a turbine (T) rotates a
generator (G). The generation voltage is 11 kV which is stepped up to 220 kV
by a step-up transformer. The output of the transformer is connected to the

high-voltage transmission line. At the receiving end of the transmission line,
a step-down transformer is used to bring the voltage level again to a lower

level. The power received is further stepped-down to lower voltage by use of
distribution transformers and is connected to the load of the consumer, i.e., to

industry, commercial buildings, and residential houses. Fig. 6.2 (b) shows the
use of distribution transformers for supply to various kinds of electrical loads

including low-voltage dc supply after rectification. Thus, we have seen that
transformers of different voltage levels and power capacity are used for
transmission, distribution, and utilization of electricity. Transformers are,

therefore, seen as one of the most important components of the whole power
system network.