5 What conditions must be met before a gener ator can be con

5 What conditions must be met before a gener- ator can be connected to a 3-phase system 6 Calculate the number of poles on the genera- tor in Fig. 12 using the information given.

Solution

In order to connect a generator to the 3 phase , four conditions must be met:

From the we can determine the speed as 1110 radians/min and frequency as 110 hz

Speed = (120*frequency)/number of poles

» no. Of poles= 120*110/1100=12

Therefore number of poles=12