Polyphase three-phase
electrical systems
Ch 11
221
Unit Application health and safety and electrical principles Outcome 4
Underpinning knowledge: when you have completed this chapter you should able to:
● state the meaning polyphase system
● describe the production generation electricity polyphase system
● describe the transmission electricity
● describe the distribution electricity
● state the reasons for ‘balancing’ single-phase loads three-phase system
● distinguish between voltages and currents star and delta connected three-phase system
O 4
t
three-phase sy
V
V
U
U W
W
6 6
2 2
tem
tem
L1 C1
2
C3
4
5
6
To phase supply
