11-differences between star connection and delta connections

 

11-differences between start connection and delta connections

Sl No.	Star connection	Delta connection
1	Two types of star connections are possible A-4-wire, 3-phase system B-3 wire. 3-phase system	Only 3 wire. 3-phase system is possible
2	Out of 4 wires, 3 wires are the phases and one is neutral	All 3 wires are phases in Delta connection
3	In Star  connection, one end of all the three wires are connected to a common point in the shape of Y to form neutral	In Delta connection every wire is connected to two adjacent wires in the form of triangle.And all the three common points of the connection form the three phases
4	Line current and phase currents are same	Line current and phase current are different.Line current =√Phase current
5	Line voltage and phase voltages are different, Line voltage =√Phase voltage	Line voltage and phase voltages are same
6	Since line voltage is more than phase voltage, insulation required for each phase is less	In Delta connection line and phase voltages are same hence more insulation is required
7	Star connections are used for both transmission and distribution applications/networks	This connection is generally used for distribution networks
8	Since insulation required is less, these connections are used for longer distances	Since insulation required is more, these connections are used for shorter distances
9	Star  connections are used where less starting current and starting torque is required	Delta connections are used where starting current and Torque is more
10	Power calculation in Start connections.   P = 3 X Vp X Ip X Cosθ   Or   P = (√3 X VL) X IL X Cosθ	Power calculation in Delta connections.   P = 3 X Vp X Ip X Cosθ   Or   P = (√3 X IL) X VL X Cosθ
11	In star connections different voltage levels are used as line voltage & phase voltages are different	In Delta connections, only single voltage is used

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