410-2317/01 – Failures and Protection of Electrical Networks (PCHS)
| Gurantor department | Department of Electrical Power Engineering | Credits | 6 |
| Subject guarantor | Ing. Matouš Vrzala, Ph.D. | Subject version guarantor | Ing. Matouš Vrzala, Ph.D. |
| Study level | undergraduate or graduate | Requirement | Compulsory |
| Year | 3 | Semester | summer |
| | Study language | Czech |
| Year of introduction | 2013/2014 | Year of cancellation | |
| Intended for the faculties | FEI | Intended for study types | Bachelor |
Subject aims expressed by acquired skills and competences
Explaining basic terms and principles of electromechanical transient effects in electric systems. After passing the subject the student is able to calculate symmetric and asymmetric short-circuit in network, ground connection in electric systems and static and dynamic stability of system. The student is also able to practise dimensioning of electric equipment according to effects of short-circuit currents. Explaining basic terms, principles and functions of electromechanical, transistor and digital protections. After passing the subject the student is able to apply the theory of protections and automatics in electric power distribution into the design of protection systems.
Teaching methods
Lectures
Tutorials
Experimental work in labs
Project work
Other activities
Summary
The subject includes theoretical part of extraordinary states in electric systems. It follows short-circuit in network and ground connection in electric systems. The subject explains basic terms of electromechanical transient effects in electric systems. The subject includes theoretical part of protections and automatics in electric power distribution. It follows line protections, transformer protections and anti-breakdown automatics. The subject explains basic terms, principles and functions of electromechanical, transistor and digital protections.
Compulsory literature:
1. Blackburn, J. Lewis: Protective relaying-principles and applications. Marcel Dekker, Inc., New York, 1998.
2. Horowitz, S. H., Phaddke, A. G.:Power system relaying. RSP Press Ltd. Tauton, 1992.
Recommended literature:
Additional study materials
Way of continuous check of knowledge in the course of semester
Processing of reports from laboratory works, design of individual projects, test.
Credit conditions: Profit minimum 20 points, attendance at laboratory work.
E-learning
Study guides are available in the LMS for students of the course.
Other requirements
There are no additional requirements for the student.
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
Lectures:
1. Definition and distribution of transient effects.
2. Calculation of short-circuit currents in complicated electric systems.
3. Characteristic values of short-circuit in general network. Parameters of elements of electric system in symmetrical systems.
4. Asymmetrical operating status of electric system. Dimensioning of electric equipment according to effects of short-circuit currents.
5. Ground connection in electric systems.
6. Basic terms of protections, operation of protections. Basic elements of protections, electromechanical and statical relays.
7. Line protections. Over-current protections, short-circuit protections, directional over-current protections.
8. Line protections. Distance (impedance) protections.
9. Line protections. Transverse and lengthwise differential protections.
10. Transformer protections. Differential protections. Frame-leakage protections, Buchholz protection.
Exercises:
1. Information about the requirements for passing the exercises. Safety considerations. The organization of the work in the labs. Instructions for elaboration of lab task.
2. Calculation of short-circuit currents according to ČSN EN 60909.
3. Calculation of symmetric and asymmetric short-circuit currents.
4. Dimensioning of electric equipment according to effects of short-circuit currents.
5. Calculation of ground connection in electric systems.
6. Setting of line over-current protections, Setting of transformer protections.
7. Laboratory electrical measurement of short-circuit currents at model.
8. Laboratory electrical measurement at digital protection.
9. Setting of line impedance protections.
10. Credit exercise.
Projects:
Calculation of symmetric short-circuit currents
Calculation of asymetric short-circuit currents
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction