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For the 66kV subtransmission network shown below, calculate the following, using a MATLAB Simulink Power System Blockset model:
1. Three phase, phase-to-phase and phase-to-earth fault currents at the 22kV Bus at Substation B. The answers should be given in Amps at 22kV.
2. The fault current flowing in Line A to B for a three phase and phase-to-earth fault on the 66kV Bus at substation C for the cases of:
i. Zero fault resistance
ii. A fault resistance of 10 ohms
The answers should be given in Amps at 66kV.
Data
Line Section
Length
Type
Impedance
A to B
10km
3Φ
Z1 = 0.19 + j0.35?/km
Z0 = 0.33 + j1.68?/km
19/3.25AAC,2.4x1.0mΔ
B to C
65km
A to C
60km
Substation B Transformers
Rating
3x10MVA.
0.5 + j10.7% on 10MVA each.
Ratio Data
66,000 to 22,000V Dy1.
Source Transmission Substation
Three Phase Short Circuit Fault Level
1500MVA
Phase-to-Earth Short Circuit Fault Level
1800MVA
2 REPORT AND ASSESSMENT
A report covering the following points should be submitted.
a. Power System Blockset model used.
b. Power System Blockset output reports.
c. The answers to 1 and 2 above.
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