Review and analyse 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 co-ordinated; 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.

The three quizzes total 30 marks. Ten marks per quiz.

This take home examination will be monitored through a ZOOM session and students will have to provide written answers to some questions.

1. Examination will be time scheduled and will take place for everyone at the same time.

2. Each student stays home with a device (preferably a laptop) essentially having a camera through which we can watch the student in a ZOOM session during the examination (please make sure you have a device with these requirements functioning).

3. That ZOOM link needs to be open throughout the exam.

4. The examination paper will be loaded to the Moodle so that students only can access it during examination period.

5. The student uses blank A4 papers (single side) to write answers.

6. At the end of the examination, he/she first takes photos of all written pages and email invigilator.

7. Later he/she scan the pages and upload to Moodle within a specified time at the end of examination.

8. Examination date and time will be within the standard examination period for Term 2-2020.

The distribution of marks across the examination questions will be presented in the examination paper.