Problem:
220v, 50hz supply is applied to
a) balanced 3-phase star connected load contains 25 ohms of resistance and 6mH of inductance in each phase
b)
Un-balanced 3-phase star connected load of 10 ohms, 3mH inductance, 20ohms, 4mh & 30 ohms , 5mh inductance for 3-phase respectively. Plot 3 phase currents and neutral laod. If source L is 6mH and value of neutral inductance is 7mH
PROGRAM CODE ( for balanced 3-phase analysis )
*balanced 3-phase analysis
*source description
VS1 1 2 SIN(0 220 50HZ 0 0 0DEG)
VS2 1 4 SIN(0 220 50HZ 0 0 120DEG)
VS3 1 6 SIN(0 220 50HZ 0 0 240DEG)
VS4 10 9 DC 0V
VS5 10 11 DC 0V
VS6 10 13 DC 0V
VS7 0 10 DC 0V
*COMPONENT DESCRIPTION
L1 2 3 6M
L2 4 5 6M
L3 6 7 6M
L4 1 0 6M
L5 8 3 6M
L6 14 5 6M
L7 12 7 6M
R1 8 9 25
R2 12 11 25
R3 14 13 25
* ANALYSIS DESCRIPTION
.TRAN 20ms 160ms
*OUTPUT DESCRIPTION
.PROBE
.END
OUTPUT
PROGRAM CODE ( for Un-balanced 3-phase analysis )
*unbalanced 3-phase analysis
*source description
VS1 1 2 SIN(0 220 50HZ 0 0 0DEG)
VS2 1 4 SIN(0 220 50HZ 0 0 120DEG)
VS3 1 6 SIN(0 220 50HZ 0 0 240DEG)
VS4 10 9 DC 0V
VS5 10 11 DC 0V
VS6 10 13 DC 0V
VS7 0 10 DC 0V
*COMPONENT DESCRIPTION
L1 2 3 6M
L2 4 5 6M
L3 6 7 6M
L4 1 0 6M
L5 8 3 3M
L6 14 5 4M
L7 12 7 5M
R1 8 9 10
R2 12 11 30
R3 14 13 20
* ANALYSIS DESCRIPTION
.TRAN 20ms 160ms
*OUTPUT DESCRIPTION
.PROBE
.END
OUTPUT
