Power System Protection

Course Description

Definitions and terminology. Electromechanical, static and numerical relays. Overcurrent protection, Distance protection. Distance protection schemes. Intertripping methods. Auto-reclosing. Differential protection. Over and undervoltage protection. Over and underfrequency protection. Thermal protection. Network protection. Busbar protection. Transformer protection. Generator and generator-transformer protection. Industrial power system protection. Motor protection. Instrument transformers for protection purposes (conventional and non-conventional c.t`s and v.t`s). Data communication inside the HV substations. Digital distance relay and digital fault locator. Testing and commissioning.

General Competencies

Having successfully completed the module, students will be able to demonstrate knowledge and understanding of fundamental concepts of power system protection, signalling and intertripping, protection of transmission and distribution circuits, protection in power plants, relay testing and commissioning. It introduces technical requirements, configuration philosophies and design solutions.

Learning Outcomes

  1. choose and setting distribution network relay protection,
  2. choose and setting transmission network relay protection,
  3. choose and setting power transformer protection,
  4. choose and setting generator protection system,
  5. choose busbar protection system,
  6. testing of protection devices.
  7. choose and setting motor protection system,
  8. choose and setting capacitor banks protection systems,

Forms of Teaching

Lectures

Lectures will be held three hours a week with the use of PowerPoint presentations and overhead projectors.

Laboratory Work

Laboratory exercises will be held in one cycle in the Laboratory of relay protection.

Internship visits

During semester there will be two technical visits of power plants.

Grading Method

Continuous Assessment Exam
Type Threshold Percent of Grade Threshold Percent of Grade
Laboratory Exercises 0 % 20 % 0 % 20 %
Quizzes 0 % 12 % 0 % 0 %
Class participation 0 % 8 % 0 % 0 %
Mid Term Exam: Written 0 % 15 % 0 %
2. Mid Term Exam: Written 0 % 15 % 0 %
Final Exam: Written 0 % 30 %
Exam: Written 0 % 50 %
Exam: Oral 30 %

Week by Week Schedule

  1. Definitions and terminology. Electromechanical, static and numerical relays.
  2. Overcurrent protection.
  3. Distance protection.
  4. Distance protection schemes. Intertripping methods. Auto-reclosing.
  5. Differential protection (generator, transformer and HV line).
  6. Digital distance relay and digital fault locator.
  7. Over and undervoltage protection. Over and underfrequency protection. Thermal protection.
  8. Network protection. Busbar protection. CB protection.
  9. Transformer protection.
  10. Generator and generator-transformer protection.
  11. Industrial power system protection. A.C. motor protection.
  12. Instrument transformers for protection purposes (conventional and non-conventional c.t`s and v.t`s).
  13. Data communication inside the HV substations. Fault record (Comtrade zapis, Digsi, Reval, Master).
  14. Choice of protection schemes and protection setings
  15. Testing and commissioning.

Study Programmes

University graduate
Electrical Power Engineering (profile)
Specialization Course (1. semester) (3. semester)

Literature

W. Schossig (2001.), Netzschutztechnik, VDE-Vert. Frankfurt am Main
P. Rush (2002.), Network Protection and Automation Guide, Alstom T&D, Levallois-Perret, France
Electricity Training Association (1995.), Power system protection; Volume 1-4, Electricity Association Services Ltd., London
A. Marušić (2006.), Zaštita elektroenergetskog sustava, skripta, Skriptarnica FER, Zagreb
J. Lewis Blackburn, Thomas J. Domin (2006.), Protective Relaying; Principles and Applications, CRC Press, New York

Laboratory exercises