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 | Choice-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
Teaching by an expert (lecture or tutorial)
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:
Recommended literature:
Additional study materials
Way of continuous check of knowledge in the course of semester
Processing of reports from laboratory tasks, design of individual projects, test.
Credit conditions: minimum 20 points, attendance at laboratory tasks.
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, fault and abnormal states.
2. Calculation of short-circuit currents in complex electric systems.
3. Ground fault in isolated networks
4. Ground fault in compensated networks
5. Basic terms of protections, operation of protections. Basic elements of protections, electromechanical, static and digital relays.
6. Line protections. Over-current protections, short-circuit protections, directional over-current protections.
7. Line protections. Distance (impedance) protections.
8. Transformer protections. Differential protections. Frame-leakage protections, Buchholz protection.
Exercise:
1. Introduction, safety training, short circuit analysis
2. Short circuits - calculations of symmetrical short circuit currents according to EN 60909, influence of reactors and AM
3. Short circuits - calculations of asymmetrical short circuit currents according to EN 60909
4. Short circuits - calculation of short circuit ratios using DIgSILENT PowerFactory software
5. Calculation of ground connection ratios, design of compensating reactor
6. Laboratory measurement of short-circuit ratios and fault locator function
7. Design and setting of overcurrent protection of lines
8. Laboratory measurements - safety interlocks and digital protections of the HV substation in the HARD building
9. Design and setting of line distance protections
10. Credit exercise, test
Projects:
Calculation of symmetrical and asymmetrical short-circuit currents - manual
Calculation of symmetrical and asymmetrical short-circuit currents - using software
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction