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 equimentpmentpment. 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. ment .; Determn

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:
   1. The protection schemes to be applied;
   2. How backup protection is achieved;
   3. The placement of CTs and VTs;
   4. Provide the basic ratings for CTs and VTs;
   5. 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:
   1. Provide a brief rationale for the selection of the scheme(s);
   2. Provide a brief rationale the placement of CTs and VTs;
   3. Outline the calculations for the ratings of CTs and VTs;
   4. Outline the calculations for overcurrent relay settings;
   5. Provide recommendations for suitable commercial relays.

1. 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;
2. 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.

Your work book should contain the worked solutions to the weekly tutorials and exercises.  The workbook is also used to record work performed while completing your substation design assignment. This will include calculations and diagrams.

Previous years have shown a strong direct correlation between the quality of the workbook submission and the final exam result. There are several key skills that are centrally important for a power systems protection engineer. Practice is required to ensure standard calculations can be performed reliably.The workbook task is intended to encourage students to undertake sufficient practice to ensure that standard protection methods can be properly applied.

Content - reasonable attempts should be present for 75% tutorial activities and in support of the protection assignment. The work book should illustrate a capacity to perform calculations accurately, with an understanding of significant figures and with the correct use of the SI engineering units. Scan the workbook to produce a single PDF for submission.

A optional formative feedback opportunity will be available at the end of weeks 4 and 9. Students will be able to submit their workbooks for informal (non-graded) feedback and guidance.

The workbook submissions are made on an individual basis.