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Page 2
Negative Sequence (acb)
??
0
an P
V V 0
? ? ?
0
cn P
V V 120
? ? ? ? ?
00
bn P P
V V 240 V 120
For both phase sequence,
??
an bn cn
V V V
Connections
Star Connection
??
?
0
LP
Lp
V 3V 30
II
ab
V = line to line voltage or line voltage
0
ab an bn P
V V V 3V 30 ? ? ? ?
So, line voltage
ab bc ca
V ,V ,V are 3 times the phase voltage & lead the respective phase voltage
by
0
30 .
Line currents
a b c
I ,I ,I in this connection are equal to phase currents.
Phase current are the currents that flow in individual phases.
Page 3
Negative Sequence (acb)
??
0
an P
V V 0
? ? ?
0
cn P
V V 120
? ? ? ? ?
00
bn P P
V V 240 V 120
For both phase sequence,
??
an bn cn
V V V
Connections
Star Connection
??
?
0
LP
Lp
V 3V 30
II
ab
V = line to line voltage or line voltage
0
ab an bn P
V V V 3V 30 ? ? ? ?
So, line voltage
ab bc ca
V ,V ,V are 3 times the phase voltage & lead the respective phase voltage
by
0
30 .
Line currents
a b c
I ,I ,I in this connection are equal to phase currents.
Phase current are the currents that flow in individual phases.
Delta Connection
?
LP
VV
0
LP
I 3I 30 ? ? ?
Line current is 3 times phase current & lags respective phase current by
0
30 .
Power in a balanced 3 ?? system
L L P P
P 3V I cos 3V I cos ? ? ? ?
L L P P
Q 3V I sin 3V I sin ? ? ? ?
??
L L P P
**
S 3V I 3V I
For power measurement, refer to electrical measurements k-notes, two wattmeter method.
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