Student ID
3652880
Enter your ID (without 's' at the front) in green shaded cell(C7). Example : 2309099
Your name and your data should appear in the data sheet. If "Incorrect ID" appears, then your name is not
(database downloaded on 17 Sept 2018). If you enrolled later, please e
Reactance (p.u.)
generator G positive sequence impedance
motor M positive sequence impedance
Transmission line positive sequence impedance
Transformer T1 positive sequence impedance
Transformer T2 positive sequence impedance
0.155
0.228
0.111
0.082
0.082
generator G negative sequence impedance
motor M negative sequence impedance
Transmission line negative sequence impedance
Transformer T1 negative sequence impedance
Transformer T2 negative sequence impedance
0.076
0.228
0.111
0.082
0.082
generator G zero sequence impedance
motor M zero sequence impedance
Transmission line zero sequence impedance
Transformer T1 zero sequence impedance
Transformer T2 zero sequence impedance
0.053
0.106
0.333
0.082
0.082
Last Name:
First Name:
Zhou
Wotong
) in green shaded cell(C7). Example : 2309099
et. If "Incorrect ID" appears, then your name is not in the database.
you enrolled later, please e-mail the course coordinator
EEET2106/ EEET2339 Assignment-2
2018
page 1 of 3
School of Engineering, Electrical and Biomedical Engineering
EEET2106/ EEET2339 Power System Analysis & Control
Assignment-2
Objectives:
The main objective of this assignment is applying your knowledge gained from Power System
Analysis and Control Course on following topics:
▪
Balanced Faults
▪
Theory of Symmetrical Components
▪
Unbalanced Faults
Reading Materials:
Examples 9.1, 9.2, 9.3, 9.4 and 9.5 of the prescribed text book are recommended prior to this
assignment.
Assignment Scenario:
Assume that a recent thunderstorm in your state has resulted in several different types of faults
(e.g., three-phase short-circuit faults, single-line to ground fault, line-to-line fault, line-to-line-toground) in the transmission system. As the newly recruited Graduate Electrical Engineer you
have been selected by the Chief Engineer to conduct a theoretical analysis of these faults.
The Chief Engineer recommend you to use the single-line diagram of the power network shown
in Figure 1 for the fault study. The power and voltage ratings for the generator G, motor M,
transmission line, transformer T1 and transformer T2 given in Table 1. The neutrals of the
generator and the delta-star transformers are solidly grounded. The motor neutral is grounded
through a reactance 0.05 pu on the motor base.
Figure 1: Single-line diagram.
Table:1 Ratings of the system components
Rated power of generator G
Rated power of motor M
Rated voltage of G
Rated voltage of M
Transformer T1 primary voltage rating
Transformer T1 secondary voltage rating
Transformer T2 primary voltage rating
Transformer T2 secondary voltage rating
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100 MVA
100 MVA
13.8 kV
13.8 kV
13.8 kV
138 kV
13.8 kV
138 kV
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EEET2106/ EEET2339 Assignment-2
2018
page 2 of 3
How to obtain System Data for your assignment:
A unique set of system data applicable to you is to be created by the excel spreadsheet
“Assign2_data_creation2018.xls”. This file can be downloaded from the Assignments section
of the Power System Analysis & Control Canvas shell. Save it on your own storage device. Open
the saved file using the Excel program and enter your student ID in cell C7 (light green shaded)
to create your own data set. Note that if you open the file in the browser instead of saving it and
then opening it with Excel, you will not be able to create your own data. This data sheet carries
your student number, name and the data applicable to you. Please ensure that you use the data in
the data sheet with your name. Answers obtained using any other data will be invalid.
Table:2 Values for this table are to be generated via the Excel Spread Sheet
Plant
generator G
motor M
Transmission line
Transformer T1
Transformer T2
Positive sequence
reactance [pu]
xxx
xxx
xxx
xxx
xxx
Negative sequence
reactance [pu]
xxx
xxx
xxx
xxx
xxx
Zero sequence
reactance [pu]
xxx
xxx
xxx
xxx
xxx
Fault Currents Calculation Tasks:
Part 1: [8 marks]
Taking the rated power of generator G as the base power, and the transformer T1 low-voltage
side rated voltage as the base voltage, calculate the Thevanin’s equivalent zero-sequence
impedance, positive sequence impedance and the negative sequence impedance viewed from
Bus-2. Specify your answers in per-unit.
Part 2: [9 marks]
Assuming the pre-fault bus voltages are at 1.05pu, calculate the fault currents in each phase for a
three-phase balanced fault at Bus-2. Specify your answers in per-unit.
Part 3: [9 marks]
Assuming the pre-fault bus voltages are at 1.05pu, calculate the fault currents in each phase for a
single-line to ground fault at Bus-2. Specify your answers in per-unit.
Part 4: [9 marks]
Assuming the pre-fault bus voltages are at 1.05pu, calculate the fault currents in each phase for a
line-to-line fault at Bus-2. Specify your answers in per-unit.
Part 5: [9 marks]
Assuming the pre-fault bus voltages are at 1.05pu, calculate the fault currents in each phase for a
line-to-line-to-ground fault at Bus-2. Specify your answers in per-unit.
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EEET2106/ EEET2339 Assignment-2
2018
page 3 of 3
Faulted bus (bus-2) voltage calculation:
Part 6: [8 marks]
Calculate the Bus-2 phase voltages for the condition in part-3, single-line to ground fault at Bus2. Specify your answers in per-unit.
Part 7: [8 marks]
Calculate the Bus-2 phase voltages for the condition in part-4, line-to-line fault at Bus-2. Specify
your answers in per-unit.
Part 8: [8 marks]
Calculate the Bus-2 phase voltages for the condition in part-5, line-to-line-to-ground at Bus-2.
Specify your answers in per-unit.
Node voltage (example: bus-3 voltage) calculation:
Part 9: [8 marks]
Calculate the Bus-3 phase voltages for the condition in part-2, for a three-phase balanced fault at
Bus-2. Specify your answers in per-unit.
Part 10: [8 marks]
Calculate the Bus-3 phase voltages for the condition in part-3, single-line to ground fault at Bus2. Specify your answers in per-unit.
Part 11:
Calculate the Bus-3 phase voltages for the condition in part-4, line-to-line fault at Bus-2. Specify
your answers in per-unit.
Part 12:
Calculate the Bus-3 phase voltages for the condition in part-5, line-to-line-to-ground at Bus-2.
Specify your answers in per-unit.
Assignment Submission:
The Assignment Submission has two components:
1. Report [20 Marks] – A detailed report should contain the workings/ computer code
associated with each Part of the assignment. That will enable to award additional marks if
the final answer is incorrect due to minor mistakes. Also, an in-depth discussion of results
should be included in the report for each section.
2. Answer Spreadsheet [80 Marks] - You need to provide the requested answers in Parts 1 to
12 in the accompanied answers spreadsheet following the description below:
(i) Please download the answer template Assign2_answers_2309099.xls from:
Power System Analysis Canvas Shell >> Assignments >> Assignment-2
(ii) Rename the file with your student number instead of the default student ID
“2309099”. The file name should be of the format Assign2_answers_xxxxxxx.xls
where xxxxxxx represents the numeric part of your student ID.
(iii) Enter your answers in the appropriate cells. The light green shaded cells are
editable and your answers should be placed in these cells. Place the numeric values
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EEET2106/ EEET2339 Assignment-2
2018
page 4 of 3
(not formulas) in the cells and should be calculated to at least four decimal points in
scientific format. Refer the default answers in the template as a guide.
(iv) Marking will be done semi-automatically by a computer program. Numerical
accuracy within 3% is essential. (Work with at least 4 significant numbers). Marks
are awarded strictly for answers.
▪ Assignment submission should be done via Canvas and you should submit both your Report
and Answer Spreadsheet using the relevant submission links.
o
The assignment submission page can be accessed from:
Power System Analysis Canvas Shell >> Assignments >> Assignment-2 >>
o
Click on the link “Submit Assignment” Button and upload your Report and
Answer Spreadsheet. To complete the submission click the “Submit” button.
▪ The assignment will be marked out of 100% based on the report and numeric answers
submitted. This assignment will account for 7.5% of the overall score for EEET2106 and
EEET2339.
Answers to the assignment are to be submitted on or before:
11:59 pm on Monday, 8th October 2018
Late Submission Penalty: Assignments submitted after but within one week from the deadline
will attract a penalty of 20%. Assignments submitted after one week from the deadlines will not
be marked.
Plagiarism: Assignment submissions should be strictly individual work, if any submission
found to be plagiarised from other sources your mark will be made zero and will be directed to
the school disciplinary committee for hearing.
---End of assignment---
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EEET2106/ EEET2339 Power
System Analysis & Control
ASSIGNMENT-2
Name | Student ID | Date
Table of Contents
Table of Contents: ................................................................. Error! Bookmark not defined.
Fault Currents Calculation Workings ............................................................................. 2
Faulted bus (bus-2) voltage calculation.......................................................................... 3
Node voltage (bus-3 voltage) calculation: .............................................................................4
PAGE 1
FAULT CURRENTS CALCULATION WORKINGS
Part 1:
Part 2:
Part 3:
Part 4:
Part 5:
Discussion:
PAGE 2
FAULTED BUS (BUS-2) VOLTAGE CALCULATION
Part 6:
Part 7:
Part 8:
Discussion:
PAGE 3
NODE VOLTAGE (BUS-3 VOLTAGE) CALCULATION:
Part 9:
Part 10:
Part 11:
Part 12:
Discussion:
PAGE 4
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