Aim:- To study Star and Delta Connection in 3-Phase AC Circuit.
Apparatus Required:-
S.No: |
Name
|
Range
|
Type
|
Quantity
|
1. |
Voltmeter |
0-600V |
MI |
1 |
2. |
Voltmeter |
0-300V |
MI |
1 |
3. |
Ammeter |
0-2A |
MI |
2 |
4. |
Rheostat |
100 ohm,5A |
Double Tube |
3 |
Theory:-
STAR
CONNECTION
Line Voltage =
Voltage between any two line terminals,
VL
=VRY = VRB =VBY
Phase Voltage =
Voltage between any one line & neutral,
VPH
=VRN = VBN = VYN
Line & phase
current is equal in case of star connection,
VRY=VRN
+(-VYN)
V 2RY
=[VRN +(-VYN)] 2
=V2RN
+ V2YN + 2VRN
VYN Cos60
VL =
VRY = √3
VPH
Circuit Diagram:-
DELTA CONNECTION
Line
Current - Current coming from the line terminal
IL = IR = IB = IY
Phase
current - It is the current flowing through the load connected between two
terminals
IPH
= IRY = IYB = IBR
IR = IRY -
IBR
I2R
= [IRY + (-IBR) ]2
= I2RY + I2BR + 2 IRY IBR
Cos60
IR
= IL = √3 IPH
Circuit Diagram:-
Observation
Table:-
Connection
|
IL(A) |
IPH(A) |
VL(V) |
VPH(V) |
Star |
1.6 |
1.6 |
300 |
173.2 |
Delta |
3.2 |
1.84 |
200 |
200 |
Result:-
1.
Ratio
Of VL/VPH = 1.732 for Star Connection
2.
Ratio
Of IL / IPH =
1.732 for Delta Connection
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