Course code ETeh4051

Credit points 3

Transient Processes and Relay Protection

Total Hours in Course120

Number of hours for lectures24

Number of hours for seminars and practical classes24

Independent study hours72

Date of course confirmation15.12.2020

Responsible UnitInstitute of Energetics

Course developer

author lect.

Aleksejs Gedzurs


Prior knowledge

ETeh2019, Applied Electrical Engineering

ETeh4037, Fundamentals of Electrical Engineering I

ETeh4048, Fundamentals of Electrical Engineering II

Course abstract

The aim of the study course is to acquire the transition processes occurring in electromagnetic circuits, their types, causes and consequences, acquire knowledge about the analytic methods of calculating the short-circuit current of various types of short-circuits and various electric networks. The main causes of accidents and damages in electromagnetic systems are being studied. Principles of transient processes simulation are being studied using MATLAB/SIMULINK environment. Frequency, current and voltage protection and devices, including protection devices operational control circuit types are studied.

Learning outcomes and their assessment

Knowledge - of the principles of operation of electrical equipment and network relay protection and their operation - test.
Skills - to choose the appropriate set of relay protections for the object, to be able to operate and control the operation of the relay protections of the object, to use modeling systems in visualization of transition processes and data analysis - practical work.

Competence - to perform efficient and economically justified selection, installation of components of relay protection system of production objects, evaluation of damages and disturbances caused by transients in electromagnetic systems - presentation.

Course Content(Calendar)

Full time intramural studies:
1. Electromagnetic transients. (Lecture - 5h, practical work - 5h)
2. Modeling of transition processes. (Lecture - 2h, practical work - 2h)
3. Transition processes of synchronous and asynchronous machines. (Lecture - 1h, practical work - 1h)
4. Transition processes in energy systems. Network parameters and transition processes. Peculiarities of power systems in agricultural objects. (Lecture - 1h, practical work - 1h)
5. Types and construction of relays. (Lecture - 1h, practical work - 1h)
6. Current protection. Fuse. Bimetallic thermocouple. Maximum and instantaneous current protection. (Lecture - 3h, practical work - 3h)
7. Voltage protection. Atmospheric surge protection. Lightning receiver system calculation methods. External and internal lightning protection systems. (Lecture - 4h, practical work - 4h)
8. Automatic control in relay protection systems. Automatic restart. Automatic backup activation. (Lecture - 1h, practical work - 1h)
9. Electric motor emergency modes and their protection. (Lecture - 3h, practical work - 3h)
10. Protection of transformers, electricity transmission networks. (Lecture - 2h, practical work - 2h)
11. Conditions for selection of relay protection and installation requirements in farms, horticulture and other agricultural objects. (Lecture - 1h, practical work - 1h)
Part time extramural studies:

All topics specified for full time studies are accomplished, but the number of contact hours is one half of the number specified in the calendar

Requirements for awarding credit points

To award credit points, tests (minimum 50%), practical work should be defended and presentation presented.

Description of the organization and tasks of students’ independent work

Practical work. Selection calculations of lightning rod protection system for a given object.
Presentation. Presentation topic is relay protection systems types. Student selects one of the protection system type and makes a presentation about it. Presentation should include:
1. failure mode analyses, breakdowns and potential economical losses;
2. Operation principles, construction and types of protection system;
3. Selection criteria for protection system components;

4. Installation and operation conditions for protection systems.

Criteria for Evaluating Learning Outcomes

Assessment consist of the following parts – 50% from test results, 20% - practical work, 30% - presentation.

Compulsory reading

1. Meļņikovs V. Elektroapgāde. 2.daļa. 2006. 142 lpp. [Tiešsaiste] [skatīts 15.12.2015.]. Pieejams:
2. Meļņikovs V. Elektroapgāde: lekciju konspekts. Rīga: Profesionālās izglītības kompetences centrs "Rīgas Valsts tehnikums", 2012. Pieejams: http://

3. Barkāns J. Enerģijas ražošana Rīga: RTU, 2001. [Tiešsaiste] [skatīts 15.12.2015.]. Pieejams:

Further reading

1. Shenkman A.L. Transient analysis of electric power circuits handbook. Springer, 2005. 569 p.
2. Network Protection and Automation Guide. 476 p. [Tiešaiste] [skatīts 15.12.2015.]. Pieejams:

3. Gers J. M. Holmes E. J. Protection of Electricity Distribution Networks . 2nd ed. IEE. 2004. 341 p.


Compulsory course for professional bachelor study program Applied Energy Engineering