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 start 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

Start 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

Start 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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11-differences between star connection and delta connections

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