ELEC5204: Power Systems Analysis and Protection (2015 - Semester 1)
|Unit:||ELEC5204: Power Systems Analysis and Protection (6 CP)|
|Faculty/School:||School of Electrical & Information Engineering|
Dr Sathiakumar, Swamidoss
|Session options:||Semester 1|
|Versions for this Unit:|
|Brief Handbook Description:||This unit provides the basis for the analysis of electricity grids using symmetrical components theory. Such analysis theory is the basis for the understanding of electrical faults and the design of protection strategies to safeguard the electrical equipment, and maintain safety of the plant at the highest possible level.
The following specific topics are covered: The types and causes of power system faults; balanced faults and short circuit levels; an introduction to fault current transients in machines; symmetric components, sequence impedances and networks; the analysis of unsymmetrical faults. Review of the impact of faults on power system behaviour; issues affecting protection scheme characteristics and clearance times; the security and reliability of protection schemes; the need for protection redundancy and its implementation as local or remote backup; zones of protection and the need for zones to overlap; the analysis and application of over-current and distance relay protection schemes with particular reference to the protection of transmission lines.
|Assumed Knowledge:||The unit assumes basic knowledge of circuits, familiarity with basic mathematics, competence with basic circuit theory and an understanding of three phase systems, transformers, transmission lines and associated modeling and operation of such equipment.|
Dr Mitchell, Keith
|T&L Activities:||Tutorial: More detailed questions to develop better understanding and analysis techniques.
Laboratory: Hands on experience with power system behaviour and protection design.
Attributes listed here represent the key course goals (see Course Map tab) designated for this unit. The list below describes how these attributes are developed through practice in the unit. See Learning Outcomes and Assessment tabs for details of how these attributes are assessed.
|Attribute Development Method||Attribute Developed|
|Extensive design and analysis work is done in tutorials, labs, and assignment.||Design (Level 4)|
|Gain an understanding of the basic concepts in electricity networks. It builds on the previous knowledge gained in circuits and power electronics and power systems.||Engineering/IT Specialisation (Level 4)|
|Gain an ability to apply their knowledge of circuit fundamentals to electricity networks analysis and protection fundamentals.||Maths/Science Methods and Tools (Level 4)|
|Need to understand and follow lab procedures and conduct experiments under controlled conditions. Need to read IEEE and IET Research Papers and Articles on Industrial Standards and assimilate this knowledge in evaluating various solutions to protection problems.||Information Seeking (Level 2)|
|Students need to work in groups in the labs. They need to write lab reports, as well as do some detailed analysis, short-curcuit analysis and protection and present it in the form of assignment reports.||Communication (Level 2)|
|Group work in labs and tutorials.||Project and Team Skills (Level 2)|
For explanation of attributes and levels see Engineering & IT Graduate Outcomes Table.
Learning outcomes are the key abilities and knowledge that will be assessed in this unit. They are listed according to the course goal supported by each. See Assessment Tab for details how each outcome is assessed.Design (Level 4)
Assignment: Assignments throughout the semester.
Lab Report: Laboratory Work with the power system simulator that offers a breadth of experimental work with the latest digital relays and some of the experiments are as follows: symmetrical faults, unsymmetrical faults, transient overvoltage, grading of overcurrent protection for three-phase faults, directional control of relay tripping, distance and zone protection, grid transformer differential protection, busbar protection, generator protection, auto-reclosing
Final Exam: End of Semester Examination
|Policies & Procedures:||See the policies page of the faculty website at http://sydney.edu.au/engineering/student-policies/ for information regarding university policies and local provisions and procedures within the Faculty of Engineering and Information Technologies.|
Note: Students are expected to have a personal copy of all books listed.
Note: References are provided for guidance purposes only. Students are advised to consult these books in the university library. Purchase is not required.
|Note on Resources:||No text required. Notes will be on the web|
Note that the "Weeks" referred to in this Schedule are those of the official university semester calendar https://web.timetable.usyd.edu.au/calendar.jsp
|Week 1||Three-phase power systems, historical developments, characteristics influencing generation and transmission, environmental aspects of electrical energy generation, transmission and distribution systems, energy utilization, balanced three-phase and unbalanced three-phase systems, introduction to short circuit analysis and symmetrical component theory.|
|Week 2||Short circuit analysis techniques, synchronous machines, synchronous generator in parallel operation, the operation of a generator on infinite busbars, salient pole generators, per unit system, overhead line, underground cables, positive, negative and zero sequence networks|
|Week 3||Equivalent circuits and parameters of electricity networks, synchronous machines, armature reaction, steady-state salient pole rotor, transient analysis, asymmetry, machine reactances, negative sequence reactance, zero sequence reactance, direct and quadrature axis values, effect of saturation on machine reactances, transformer positive sequence equivalent circuits, transformer zero sequence equivalent circuits, auto-transformers, transformer impedances|
|Week 4||Overhead lines and cables, calculation of series impedance, calculation of shunt impedance, overhead line circuits with or without earth wires, OHL equivalent circuits, cable circuits, overhead line and cable data|
|Week 5||Current and voltage transformers, capacitor voltage transformers, errors, composite errors, transformer classes, optical instrument transformers, Electromechanical relays, static relays, digital relays, numerical relays|
|Week 6||Principles of time/current grading, standard I.D.M.T. overcurrent relays, combined I.D.M.T. and high set instantaneous overcurrent relays, very inverse overcurrent relays, Extremely Inverse overcurrent relays, Independent (definite) time overcurrent relays, Relay current setting, Relay time grading margin, calculation of phase fault overcurrent relay settings, directional phase fault overcurrent relays, Earth fault protection, Directional earth fault overcurrent protection, Earth fault protection|
|Assessment Due: Quiz|
|Week 7||scheme considerations|
|protection systems, Phase comparison protection|
|Unit protection of feeders, balanced voltage system, digital/Numerical current differential|
|Week 8||differential protection|
|Busbar protection requirements, types of protection system, system protection schemes, Differential protection principles, high impedance|
|Week 9||Transformer protection, winding faults, magnetising inrush, transformer overheating, transformer overcurrent protection, restricted earth fault protection, differential protection, combined differential and restricted earth fault schemes, earthing transformer protection, auto-transformer protection, tank-earth protection, oil and gas devices, transformer-feeder protection, condition monitoring of transformers|
|Week 10||Principles of distance relays, relationship between relay voltage and ZS/ZL ratio, zones of protection, distance relay characteristics, effect of source impedance and earthing methods|
|Week 11||direct-connected generators, differential protection of generator–transformer units, overcurrent protection, stator earth fault protection, overvoltage protection, undervoltage protection, low forward power/reverse power protection, unbalanced loading, under/overfrequency/overfluxing protection, rotor faults, loss of excitation protection, overheating, mechanical faults|
|Generator earthing, stator winding faults, stator winding protection, differential protection of|
|Week 12||motor protection, RTD temperature detection, undervoltage protection, loss-of-load protection, protection for synchronous motors|
|AC motor protection, thermal (Overload) protection, start/stall protection, short circuit protection, earth fault protection, negative phase sequence protection, wound rotor induction|
|Exam Period||Assessment Due: Final Exam|
The following is a list of courses which have added this Unit to their structure.
This unit contributes to the achievement of the following course goals:
|Design (Level 4)||Yes||14%|
|Engineering/IT Specialisation (Level 4)||Yes||50.5%|
|Maths/Science Methods and Tools (Level 4)||Yes||25%|
|Information Seeking (Level 2)||Yes||0%|
|Communication (Level 2)||Yes||4%|
|Professional Conduct (Level 2)||No||6.5%|
|Project and Team Skills (Level 2)||Yes||0%|
These goals are selected from Engineering & IT Graduate Outcomes Table which defines overall goals for courses where this unit is primarily offered. See Engineering & IT Graduate Outcomes Table for details of the attributes and levels to be developed in the course as a whole. Percentage figures alongside each course goal provide a rough indication of their relative weighting in assessment for this unit. Note that not all goals are necessarily part of assessment. Some may be more about practice activity. See Learning outcomes for details of what is assessed in relation to each goal and Assessment for details of how the outcome is assessed. See Attributes for details of practice provided for each goal.