- 2011
View content for printing (opens a new page)EEEN40076 - Power System Protection
Availability - Course (Compulsory/Elective)
Aims
The unit aims to:
- Introduce the students to the classical and advanced operating principles and main features of various types of relays and protection schemes
- Provide the students with the knowledge and practical skills necessary to apply these relays and schemes to the protection of plant and systems including transmission, distribution and industrial networks and rotating machines
- Introduce novel principles of wide area monitoring, protection and control
- Provide the students with the knowledge how to integrate modern information and communication technology in protection schemes.
Brief Description
BRIEF DESCRIPTION OF THE UNIT
(1) General protection issues
(i) The importance of protection to the reliability of industrial and commercial power networks and how this is achieved using multi-functional numerical protection and control relays;
(ii) Transducers for use with protection relays such as current and voltage transformers
(2) Relay types and designs
(i) The main features of overcurrent relays, the principles of time-current grading and the co-ordination procedures necessary to ensure dependable and secure, selective protection;
(ii) The operating principles of high and low impedance differential protection schemes;
(iii)The protection requirements of busbars and how these requirements can be satisfied using conventional relays;
(iv) How transformers can be protected using a multi-functional protection scheme based on over-current and differential relays;
(v) The nature and effect of faults within a generator and how they can be detected using different types of relays;
(vi) The main features and operating principles of distance relays and they are applied within a transmission network;
(vii)Protection of rotating machines, including motor and generator protection;
(viii)The main features and operating principles of distance relays and their application for protection of transmission networks;
(3) Advanced protection systems
(i) The advantages and disadvantages of multi-functional numerical protection and control devices (ied's) as compared against conventional solutions based on a multitude of single-function relays and control devices;
(ii) The future of protection and its roles within active distribution networks;
(iii) Advanced overhead lines protection through application of disturbance recorders and intelligent fault location algorithms;
(iv) Principles of the numerical differential protection of feeders;
(v) How protection and control can be integrated and realized in a single device;
(vi) Wide area monitoring, protection and control systems, aimed for the protection and control of integrated power systems;
(vii) Communication technology used in protection of power systems;
Learning Outcomes
Students will be able to:
Knowledge and understanding
- Identify the main components and features of a protection scheme and understand how to implement this using relays;
- Apply conventional and numerical relays to the protection of rotating machines, busbars, transformers and feeders;
- Explain the differences between the designs of protection schemes for transmission, distribution and industrial/commercial networks and show they can be modified to improve reliability and power quality;
- Perform an overcurrent grading study on a radial distribution network;
- Discuss the reasons for choosing multi-function numerical protection and control devices as compared to using conventional analogue electronic or electro-mechanical relays.
- Understand the challenges and the influence of modern technology to power system protection;
- Understand the importance of communication and microprocessor technology in the field of power system protection;
- Perform a distance protection grading study on a transmission network;
Intellectual skills
- Evaluate the relay settings necessary to protect a distribution, transmission or industrial/commercial network;
- Justify why a particular relay was chosen and explain how it can be applied within a network;
Practical skills
- Use relay test sets to evaluate the operating behaviour of a multi-functional relay;
- Use a physical transmission line model to investigate the effect of current transformer saturation on a differential relay;
- Use software packages for simulation of faults on elements of power system and to be able to understand the physical processes during and after faults;
- Use a selected signal processing tools for evaluation of faults in power systems.
Transferable skills and personal qualities
- Understand why the theoretical behaviour of a device is often different to the actual behaviour;
- Learn the importance of being approximately right rather than precisely wrong;
- Why protective relaying is often considered to be both an "art" and a "science"
- Learn how multidisciplinary approach for solving practical and theoretical problems can bring a solution.
Teaching & Learning Process (Hours Allocated To)
Lectures |
Tutorials/Example Classes |
Practical Work/Laboratory |
Private Study |
Total |
|---|---|---|---|---|
| 24 | 6 | 12 | 108 | 150 |
Assessments
Unseen written examination
Four questions, answer all questions.
Duration: 2 hours
Calculators are permitted
This examination forms 80% of the unit assessment.
Laboratories
The number of laboratories attended: 2
The length of each laboratory: 3
Laboratories are assessed by a written Coursework (practical software examination using PSCAD simulation tool: overcurrent and distance protection) based on laboratory attendance
The maximum mark for each laboratory forms 20% of the overall unit mark
Staff Involved
| Dr Haiyu Li | - | Lecturer |
| Prof Vladimir Terzija | - | Lecturer |
| Prof Peter Crossley | - | Lecturer |