13.1.2 line and current
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VL = VP (delta)
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IL = √ 3 IP (delta)
L1 Red
L2 White
L3 Blue
Comparisons between Star and Delta connected systemsComparisons 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 IpTwo values of voltage available One common voltage only available
Has common connection available for earthing
No common earthing point
VL leads V by 30°E IL leads I, by 30°ESuited to long-distance power transmission *
Suited to locally operated machinery *
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.
Comparisons between Star and Delta connected systemsComparisons 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 IpTwo values of voltage available One common voltage only available
Has common connection available for earthing
No common earthing point
VL leads V by 30°E IL leads I, by 30°ESuited to long-distance power transmission *
Suited to locally operated machinery *
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.
Comparisons between Star and Delta connected systemsComparisons 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 IpTwo values of voltage available One common voltage only available
Has common connection available for earthing
No common earthing point
VL leads V by 30°E IL leads I, by 30°ESuited to long-distance power transmission *
Suited to locally operated machinery *
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.
Comparisons between Star and Delta connected systemsComparisons 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 IpTwo values of voltage available One common voltage only available
Has common connection available for earthing
No common earthing point
VL leads V by 30°E IL leads I, by 30°ESuited to long-distance power transmission *
Suited to locally operated machinery *
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.
Comparisons between Star and Delta connected systemsComparisons 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 IpTwo values of voltage available One common voltage only available
Has common connection available for earthing
No common earthing point
VL leads V by 30°E IL leads I, by 30°ESuited to long-distance power transmission *
Suited to locally operated machinery *
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.
Comparisons between Star and Delta connected systemsComparisons 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 IpTwo values of voltage available One common voltage only available
Has common connection available for earthing
No common earthing point
VL leads V by 30°E IL leads I, by 30°ESuited to long-distance power transmission *
Suited to locally operated machinery *
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.
Comparisons between Star and Delta connected systemsComparisons 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 IpTwo values of voltage available One common voltage only available
Has common connection available for earthing
No common earthing point
VL leads V by 30°E IL leads I, by 30°ESuited to long-distance power transmission *
Suited to locally operated machinery *
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.
Comparisons between Star and Delta connected systemsComparisons 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 IpTwo values of voltage available One common voltage only available
Has common connection available for earthing
No common earthing point
VL leads V by 30°E IL leads I, by 30°ESuited to long-distance power transmission *
Suited to locally operated machinery *
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.
Comparisons between Star and Delta connected systemsComparisons 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 IpTwo values of voltage available One common voltage only available
Has common connection available for earthing
No common earthing point
VL leads V by 30°E IL leads I, by 30°ESuited to long-distance power transmission *
Suited to locally operated machinery *
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.
* Both connections have their advantages in the distribution of electrical power and both are used in situations dependent on local conditions and requirements.