Calculate power system blockset model, MATLAB Programming

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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

Data

A to B

10km

Z1 = 0.19 + j0.35?/km

Z0 = 0.33 + j1.68?/km

19/3.25AAC,2.4x1.0mΔ

B to C

65km

Z1 = 0.19 + j0.35?/km

Z0 = 0.33 + j1.68?/km

19/3.25AAC,2.4x1.0mΔ

A to C

60km

Z1 = 0.19 + j0.35?/km

Z0 = 0.33 + j1.68?/km

19/3.25AAC,2.4x1.0mΔ

Substation B Transformers

Rating

3x10MVA.

Impedance

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

515_Power Engineering Design.png

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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