1. !

2. !

3. !

4. !

5. !

6. !

7. VL = VP (delta)

8. !

9. IL = √ 3 IP (delta)

10. L1 Red L3 Blue
L2 White

13. Comparisons between Star and Delta connected systems
Star (Y) Delta (∆)
Similar ends connected Dissimilar ends connected
For balanced or unbalanced loads More suitable for balanced loads
VL = √ 3 Vp VL = VP
IL = Ip IL = √ 3 Ip
Two values of voltage available One common voltage only available
Has common connection available No common earthing point
for earthing
VL leads V by 30°E IL leads I, by 30°E
Suited to long-distance power Suited to locally operated machinery *
transmission *
* Both connections have their advantages in the distribution of electrical
power and both are used in situations dependent on local conditions and
requirements.

14. Comparisons between Star and Delta connected systems
Star (Y) Delta (∆)
Similar ends connected Dissimilar ends connected
For balanced or unbalanced loads More suitable for balanced loads
VL = √ 3 Vp VL = VP
IL = Ip IL = √ 3 Ip
Two values of voltage available One common voltage only available
Has common connection available No common earthing point
for earthing
VL leads V by 30°E IL leads I, by 30°E
Suited to long-distance power Suited to locally operated machinery *
transmission *
* Both connections have their advantages in the distribution of electrical
power and both are used in situations dependent on local conditions and
requirements.

15. Comparisons between Star and Delta connected systems
Star (Y) Delta (∆)
Similar ends connected Dissimilar ends connected
For balanced or unbalanced loads More suitable for balanced loads
VL = √ 3 Vp VL = VP
IL = Ip IL = √ 3 Ip
Two values of voltage available One common voltage only available
Has common connection available No common earthing point
for earthing
VL leads V by 30°E IL leads I, by 30°E
Suited to long-distance power Suited to locally operated machinery *
transmission *
* Both connections have their advantages in the distribution of electrical
power and both are used in situations dependent on local conditions and
requirements.

16. Comparisons between Star and Delta connected systems
Star (Y) Delta (∆)
Similar ends connected Dissimilar ends connected
For balanced or unbalanced loads More suitable for balanced loads
VL = √ 3 Vp VL = VP
IL = Ip IL = √ 3 Ip
Two values of voltage available One common voltage only available
Has common connection available No common earthing point
for earthing
VL leads V by 30°E IL leads I, by 30°E
Suited to long-distance power Suited to locally operated machinery *
transmission *
* Both connections have their advantages in the distribution of electrical
power and both are used in situations dependent on local conditions and
requirements.

17. Comparisons between Star and Delta connected systems
Star (Y) Delta (∆)
Similar ends connected Dissimilar ends connected
For balanced or unbalanced loads More suitable for balanced loads
VL = √ 3 Vp VL = VP
IL = Ip IL = √ 3 Ip
Two values of voltage available One common voltage only available
Has common connection available No common earthing point
for earthing
VL leads V by 30°E IL leads I, by 30°E
Suited to long-distance power Suited to locally operated machinery *
transmission *
* Both connections have their advantages in the distribution of electrical
power and both are used in situations dependent on local conditions and
requirements.

18. Comparisons between Star and Delta connected systems
Star (Y) Delta (∆)
Similar ends connected Dissimilar ends connected
For balanced or unbalanced loads More suitable for balanced loads
VL = √ 3 Vp VL = VP
IL = Ip IL = √ 3 Ip
Two values of voltage available One common voltage only available
Has common connection available No common earthing point
for earthing
VL leads V by 30°E IL leads I, by 30°E
Suited to long-distance power Suited to locally operated machinery *
transmission *
* Both connections have their advantages in the distribution of electrical
power and both are used in situations dependent on local conditions and
requirements.

19. Comparisons between Star and Delta connected systems
Star (Y) Delta (∆)
Similar ends connected Dissimilar ends connected
For balanced or unbalanced loads More suitable for balanced loads
VL = √ 3 Vp VL = VP
IL = Ip IL = √ 3 Ip
Two values of voltage available One common voltage only available
Has common connection available No common earthing point
for earthing
VL leads V by 30°E IL leads I, by 30°E
Suited to long-distance power Suited to locally operated machinery *
transmission *
* Both connections have their advantages in the distribution of electrical
power and both are used in situations dependent on local conditions and
requirements.

20. Comparisons between Star and Delta connected systems
Star (Y) Delta (∆)
Similar ends connected Dissimilar ends connected
For balanced or unbalanced loads More suitable for balanced loads
VL = √ 3 Vp VL = VP
IL = Ip IL = √ 3 Ip
Two values of voltage available One common voltage only available
Has common connection available No common earthing point
for earthing
VL leads V by 30°E IL leads I, by 30°E
Suited to long-distance power Suited to locally operated machinery *
transmission *
* Both connections have their advantages in the distribution of electrical
power and both are used in situations dependent on local conditions and
requirements.

21. Comparisons between Star and Delta connected systems
Star (Y) Delta (∆)
Similar ends connected Dissimilar ends connected
For balanced or unbalanced loads More suitable for balanced loads
VL = √ 3 Vp VL = VP
IL = Ip IL = √ 3 Ip
Two values of voltage available One common voltage only available
Has common connection available No common earthing point
for earthing
VL leads V by 30°E IL leads I, by 30°E
Suited to long-distance power Suited to locally operated machinery *
transmission *
* Both connections have their advantages in the distribution of electrical
power and both are used in situations dependent on local conditions and
requirements.