Q1. A balanced 3 phase Y-Y connected circuit with positive sequence is as shown in the figure. 06Ω jΩ 1.20 jóN 68 Ω 46Ω 200 20° | 200 2-120° 0.6 N j2 N 1.2N j6N 68 N ¡46N N | 200 2120° 0.6 2 j20 1.20 jóN 68 N j46 N a) Construct a single-phase equivalent circuit of the 3-phase system. b) Calculate the line currents: laa, Ibe and Icc. c) Calculate the phase voltages at the load terminals: Van, VBN and VCN. d) Calculate the line voltages at the load terminals: VAB, VBc and VCa.

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Q1. A balanced 3 phase Y-Y connected circuit with positive sequence is as shown
in the figure.
0.62 j20
1.20 jóN
68 N j46N
200 20°
200 2-120°
IN
0.6N j2N
m
1.20 j6 N
68 N j46 N
b
| 200 2120°
0.62 j2N
1.20 j6N
68 N j46 N
a) Construct a single-phase equivalent circuit of the 3-phase system.
b) Calculate the line currents: laa, IbB and Icc.
c) Calculate the phase voltages at the load terminals: VAN, VBN and VCN.
d) Calculate the line voltages at the load terminals: VAB, VBC and VCA.
Transcribed Image Text:Q1. A balanced 3 phase Y-Y connected circuit with positive sequence is as shown in the figure. 0.62 j20 1.20 jóN 68 N j46N 200 20° 200 2-120° IN 0.6N j2N m 1.20 j6 N 68 N j46 N b | 200 2120° 0.62 j2N 1.20 j6N 68 N j46 N a) Construct a single-phase equivalent circuit of the 3-phase system. b) Calculate the line currents: laa, IbB and Icc. c) Calculate the phase voltages at the load terminals: VAN, VBN and VCN. d) Calculate the line voltages at the load terminals: VAB, VBC and VCA.
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