Master of Engineering
(Electrical Systems)

Master of Engineering (Electrical Systems) 2
MEE512_Assessment3_PaperB_v1
Assessment Instructions:
1. Please familiarise yourself with the EIT Academic Honesty and Misconduct Policy, in order to
understand your requirements and responsibilities as a student of EIT.
2. Please refer to our Assessment, Moderation and Student Progress Procedure for
information relating to extensions. Extension requests should be submitted to your LSO at
least 3 days prior to the due date.
3. Assessments submitted via email will not be accepted.
4. Assessments must be submitted through Turn-it-in (unless otherwise stated).
Your submission must:
a. Be a single document (Word or PDF only)
b. Include at least 20 words of machine-readable text, and
c. Not exceed 10MB.
5. You must use the provided assessment cover page available on your Moodle student
homepage. Submissions without a cover page will not be accepted.
6. You must correctly title your document/s. For example:
UNIT#_ASSESSMENT#_YOURNAME_DATE
E.g. ME501_Assessment2_SteveMackay_01Aug2019
7. You must reference all content used from other sources including course materials, slides,
diagrams, etc. Do not directly copy and paste from course materials or any other resources.
Refer to the referencing section of the EIT eLibrary on Moodle for referencing guides.
8. It is your responsibility to check that you have submitted the correct file, as revised
submissions are not permitted after the due date and time.
Important note: Failure to adhere to the above may result in academic penalties. Please refer to
the unit outline or EIT Policies and Procedures for further information.
Master of Engineering (Electrical Systems) 3

Please complete your answers on the assessment cover page document available on Moodle.
Clearly label your question numbers (there is no need to copy the full question over). Include all working
out.
Part 1:
A radial distribution system is supplied from 22 kV network shown in Figure 1. The details of the
load impedances and equipment are indicated on the single line diagram and Table 1.
Use the given information in Figure 1 and Table 1 to solve Question 1.
Master of Engineering (Electrical Systems) 4
MEE512_Assessment3_PaperB_v1
Figure 1
Table 1

Question 1: (50 marks)
a) Use ETAP software to build the model of the network and run the short circuit simulation:
(25 marks)
i. determine the 3-phase fault level current (kA) at Bus 22 kV.
Master of Engineering (Electrical Systems) 5
ii. determine the 3-phase fault level current (kA) at Bus 0.415 kV.
iii. determine the fault level at the motor terminal.
Assumptions:
• Relay selection: using the ETAP library, select a protection manufacturer (for example ABB,
Schneider, Schweitzer, etc.) and select the relevant over current protection relays.
• Consider the coordination time between relays is 0.25 seconds.
• TMS selection is based on the range and steps available on the selected relay.
• The assumption from the utility for Relay 1:
TSM = 0.6 p.u.
Pick-up (sec) = 1 p.u.
CT RATIO = 200/1
b) Use time delayed and instantaneous over current relays to perform proper discrimination
and coordination settings to protect the network. (A screenshot of the ETAP modeling must
be included in the report). (25 marks)
Part 2

Figure 2
Master of Engineering (Electrical Systems) 6
MEE512_Assessment3_PaperB_v1
b) Figure 3 shows a single-line diagram of a portion of a power station. Considering an
adequate discrimination margin, determine the relay settings of phase overcurrent relays of
IDMT type used therein. Assume that the minimum operating time of relays beyond a PSM
equal to 20 is constant at 2.3 seconds at a TMS of 1.0. The fault level at the 6.6 kV bus is 45
kA and that at the 415 V bus is 42 kA. (25 marks)
Figure 3
END OF ASSESSMENT