Page 26 - Practical Power System and Protective Relays Commissioning

Substations Chapter | 2 21

Main unit transformer
Transmission line
Generator
G
Generator circuit
breaker
Unit auxiliary Transmission line
transformer for
power starting

CB

Auxiliary bus
HV bus
FIGURE 2.16 Unit scheme employing generator circuit breaker.

2.5.2.2 Unit scheme employing generator circuit breaker
Unit scheme employing generator circuit breaker as shown in Fig. 2.16, note
that the station transformer is not used, and starting of generator unit auxili-
aries is done through the high voltage busbar.