![]() Why Transmission Line Transformers are used as Star-Delta or Star-Wye Connection? |
The main use of the star-delta or star-wye connection is at the substation end of the transmission line where the voltage is to be stepped down.
What Is The Difference Between A Star And A Delta Connection?
Star
Connection |
Delta
Connection |
1.
Line
current = phase current |
1.Line
current = √3 × phase current |
2.
Line
voltage = √3 phase voltage |
2.
Line
Voltage = Phase Voltage |
3.
Total
power = √3 × VL × IL ×power factor |
3.
Total
power = √3 × VL × IL × power factor |
4.
Phase
voltage is √3 times less than the line voltage due to which the number of turns
it takes to winding is less. This saves copper. |
4.
Due to the
same line voltage and phase voltage, the number of turns in the winding of
this connection is high. |
5.
Neutral is
available in it. |
5.
Which is
not neutral. |
6.
Due to the
availability of neutral, 2 types of voltages are available such as 240 Volt
phase voltage and 415 Volt line voltage. Hence the lighting load on a single
phase and power load on 3 Phases can be added to this connection. |
6. Only 415
volt 3 Phase is available in this connection. For this reason, you cannot
take a load of 1 single phase in it. |
7.
In this
the line voltage is 30° leading to this phase voltage. |
7.
In this
line current it is 30° leading from phase current. |
8.
It has a
lower breakdown voltage. |
8. It has a low breakdown voltage. |
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