Question $2$

The generator in Fig. $1$ delivers $1$ pu active power at $0\mathrm{.}85$ pf lagging to the infinite bus.

a$)$ Calculate the internal voltage of the generator.

$15.$

b$)$ Calculate the maximum power and the initial load angle.

c$)$ If B$1$ and B$2$ are opened suddenly, calculate:

i$)$ The maximum power.

ii$)$ The new steady state angle.

iii$)$ Is the system stable?