3.15. The three-phase power and line-line ratings of the electric power system shown in Figure 3.34 are given below. Ti V₂ OBE G FIGURE 3.34 1 Line 2 T2 Vm 38 M

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3.15. The three-phase power and line-line ratings of the electric power system
shown in Figure 3.34 are given below.
Τ
V₂
OBE
G
1
FIGURE 3.34
One-line diagram for Problem 3.15
G₁: 60 MVA
T₁:
50 MVA
50 MVA
T2:
M: 43.2 MVA
Line:
Line
20 kV
20/200 kV
200/20 kV
18 KV
200 kV
2
X = 9%
X = 10%
X = 10%
X = 8%
Z= 120+ j200
T2
38
Vm
M
(a) Draw an impedance diagram showing all impedances in per-unit on a
100-MVA base. Choose 20 kV as the voltage base for generator.
Transcribed Image Text:3.15. The three-phase power and line-line ratings of the electric power system shown in Figure 3.34 are given below. Τ V₂ OBE G 1 FIGURE 3.34 One-line diagram for Problem 3.15 G₁: 60 MVA T₁: 50 MVA 50 MVA T2: M: 43.2 MVA Line: Line 20 kV 20/200 kV 200/20 kV 18 KV 200 kV 2 X = 9% X = 10% X = 10% X = 8% Z= 120+ j200 T2 38 Vm M (a) Draw an impedance diagram showing all impedances in per-unit on a 100-MVA base. Choose 20 kV as the voltage base for generator.
d)
TRANSFORMER ANALYSIS
Type of parameters for input
To obtain equivalent circuit from tests
To input individual winding impedances
To input transformer equivalent impedance
To quit
Select number of menu --> 2
Shunt branch ref. to LV side Shunt branch ref. to HV side
Rc = 10.000 ohm Rc = 1000.000 ohm
Xm = 15.000 ohm Xm = 1500.000 ohm
Enter Transformer rated power in kVA, S = 150
Enter rated low voltage in volts = 240
Enter rated high voltage in volts = 2400
Enter LV winding series impedance R1+j*X1 in ohm=0.002+j*.0045
Enter HV winding series impedance R2+j*X2 in ohm=0.2+j*0.45
Enter 'Iv' within quotes for low side shunt branch or
enter 'hv' within quotes for high side shunt branch -> 'hv'
Shunt resistance in ohm (if neglected enter inf) = 1000
Shunt reactance in ohm (if neglected enter inf) = 1500
Series branch ref. to LV side Series branch ref.to HV side
Ze = 0.0040 + j 0.0090 ohm Ze = 0.4000 + j 0.90 ohm
Select
Hit return to continue
Enter load KVA, S2 = 150
Enter load power factor, pf = 0.8
1230
Transcribed Image Text:d) TRANSFORMER ANALYSIS Type of parameters for input To obtain equivalent circuit from tests To input individual winding impedances To input transformer equivalent impedance To quit Select number of menu --> 2 Shunt branch ref. to LV side Shunt branch ref. to HV side Rc = 10.000 ohm Rc = 1000.000 ohm Xm = 15.000 ohm Xm = 1500.000 ohm Enter Transformer rated power in kVA, S = 150 Enter rated low voltage in volts = 240 Enter rated high voltage in volts = 2400 Enter LV winding series impedance R1+j*X1 in ohm=0.002+j*.0045 Enter HV winding series impedance R2+j*X2 in ohm=0.2+j*0.45 Enter 'Iv' within quotes for low side shunt branch or enter 'hv' within quotes for high side shunt branch -> 'hv' Shunt resistance in ohm (if neglected enter inf) = 1000 Shunt reactance in ohm (if neglected enter inf) = 1500 Series branch ref. to LV side Series branch ref.to HV side Ze = 0.0040 + j 0.0090 ohm Ze = 0.4000 + j 0.90 ohm Select Hit return to continue Enter load KVA, S2 = 150 Enter load power factor, pf = 0.8 1230
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