Review and analyze selected features of an integrated substation protection system. The major technical deliverables are: A simplified protection diagram; The identification of suitable protection zones; Determining suitable protection schemes within each zone; Identifying suitable commercial equipment; Demonstrating that the actions of the protection schemes are coordinated; Determining specified key parameters for protection equipment. Students will present an engineering report that includes a Simplified Protection Diagram; A Design Summary and a Main Body. Page limits apply. Three optional formative feedback opportunities on specific assignment tasks are available in weeks six, eight and ten. This is a team based assessment. The preferred team size is two. Where circumstances exist, the team size can vary. Teams can self-select their members and must advise the lecturer of the team membership via email before the end of week two. For team based assignments will be submitted with a written statement outlining the contribution of each team member.

The full assignment document is available through Moodle before the start of the term.

The Simplified Protection Diagram

It is acceptable to hand draw the diagram (CAD can take time). The diagram should show clearly:

• The primary plant – transformers, breakers and busbars
• The CT and VT locations
• The protection relays with a single line connection to their inputs (generally CTs and VTs) and outputs (circuit breaker operating coils). Show the IEEE device numbers on the relays.

To achieve clarity of presentation the simplified drawing can omit:

• Interconnections between the relays;
• The relay tables;
• Details of the housekeeping power supplies.

Design Summary

The design summary would be expected to refer to the protection diagram. It should:

1. Identify the protection zones;
2. For each protection zone specify:

           a. The protection schemes to be applied;

           b. How backup protection is achieved;

           c. The placement of CTs and VTs;

           d. Provide the basic ratings for CTs and VTs;

           e. For overcurrent protection schemes only, give suitable relay settings.

Main Body

Provide an overview of the protection zones and protection schemes;

1. For each protection zone your plan will specify:

a. Provide a brief rationale for the selection of the scheme(s);

b. Provide a brief rationale the placement of CTs and VTs;

c. Outline the calculations for the ratings of CTs and VTs;

d. Outline the calculations for overcurrent relay settings;

e. Provide recommendations for suitable commercial relays.

2. For each protection zone, give at least two examples of how the protection system will safely and reliably detect and isolate faults within the protection zone. One fault will be a earth fault, one fault will be a line to line fault;

3. For each protection zone, give at least one example of how the protection system will discriminate against a fault outside of the protection zone.

This is a team based assignment.

Three on line quizzes covering weeks 1-4; 5-6 and 7-9. Most questions are multiple choice and most questions require some calculations to select a correct answer. Several attempts at each quiz are allowed but at each attempt new (but similar) questions are presented. Quizzes contain between ten and twenty questions. Most students will require less than one hour to complete a quiz attempt.

No Assessment Criteria

This online test may cover all topics from weeks 1 to 12 and may consist of a mix 4-6 numerical as well as descriptive answer questions.

This online test will be held during the University exam period (Week 13 or 14). The exact date and time will be confirmed by the end of week 9. This online test has a duration of 3 hrs. You will be provided with an additional 30 minutes to read the paper and to scan and upload the answer scripts. The Moodle submission link will become inactive 3.5 hrs after the start time. You are encouraged to sit the test from a location with a good Internet connection and where you have access to a scanner. If you are unable to find a scanner, you can use your mobile phone to scan and upload the answer scripts. Please find a list of Camera Scan apps below that is suitable for this.

a. Adobe Scan (DC) https://adobescan.app.link/d/1n1NntFHTkb

b. Microsoft Lens https://apps.apple.com/au/app/microsoft-lens-pdf-scanner/id975925059

c. SwiftScan https://swiftscan.app/en/index.html

d. CamScanner https://www.camscanner.com/

e. ClearScan https://clearscanapp.com/

No Assessment Criteria