FEKT-BPC-EPRAcad. year: 2020/2021
Main topics of the course:
Main state, stress and functions of el. apparatuses, LV and HV e. apparatuses.
Switching on in el. circuits. Inrush current. Switching off in el. circuits. Recovery voltage.
Heat effects of el. current.
Force effects of el. current.
Switching off in el. circuits without switching arc. Electrical discharges. Switching proccess with el. arc.
Switching off of opperational and short-circuit currents. Electrical contacts.
El. apparatuses without el. arc and operational el. apparatuses. Design and properties.
Power el. apparatuses. Design and properties.
Instrumental transformes. Gaseous insulated systems with SF6.
Principles of el. devices protection.
Protection of lines against overload.
Protection of lines againts short-circuit currents. Testing of el. apparatuses.
Learning outcomes of the course unit
1.+2. Students know (can describe and explain)
- main physical phenomena, functional state, function and stress in el. apparatuses,
- main function, kinds and utilization of el. apparatuses in el. circuit LV, MV and HV,
- force and heat action on components of el. apparatuses
- characteristics of each circuit brakers,
- bases of el. devices protection.
3. Students can (are able):
- measure and interpet results of 8th laboratory exercises,
- interpret results of 4th numerical task.
4. Students are able to analyse and clasify:
- each kinds of el. apparatuses acording to different classifier,
- circuit breakers and protection apparatuses.
5. Students are able to qualify and recommend:
- adequate el. apparatus for el. circuit in dependence on parameters,
- adequate circuit breaker for protected device in circuit.
6. Students are able to compose and defence:
- reports and results from laboratory excercises,
- semestral and bachelor projets.
Student who will book this course should to know basic mathematicla operation, physical and electrotechnical principles.
Atom construction. Electrical charges. Electrical field. Elementary electrotechnical laws (Coulomb, Ohm, Faraday, Kirchhoff). Magnetic field. Forces acting on charges and wires. Differential equation describing RL and RLC circuits. Elementary transient phenomena. Scalar and vector product. Goniometrical function. Integral function of one variable.
Recommended optional programme components
Recommended or required reading
Kříž, M.: Dimenzování a jištění elektrických zařízení, IN-EL,spol.s r.o., Praha, 2008.
Vávra, Z., Vaněk, J.: Vysoké napětí a elektrické přístroje, Laboratorní a numerická cvičení, Část II: Elektrické přístroje, elektronický text, FEKT VUT v Brně, 2003.
Havelka, O. a kol.: Elektrické přístroje, SNTL, 1985.
Browne,T.,E.: Circuit interruption, N. York,1984.
Planned learning activities and teaching methods
Teaching methods depend on the type of course unit as specified in the article 7 of BUT Rules for Studies and Examinations.
1. Explanation of each subjects in lectures (L1-L13).
2. Exercises of each subjects during 4th numerical exercises (N1-N4).
3. Exercises of each subjects during 8th laboratory task (L1-L8).
4. All text available in E-learning.
Assesment methods and criteria linked to learning outcomes
Numerical exercises N1-N4. Each 1 point. Min. 2 p., max. 4 p.
Laboratory task L1-L8. Each task 2 points. Min. 8 p., max. 16 p.
Written test about content of numerical exercises an laboratory task. min. 5 p., max 20 p.
Written part of examination. Min 30 point, max. 60 points.Numerical exercises N1-N4. Each 1 point. Min. 2 p., max. 4 p.
Language of instruction
1. Main functions of el. apparatuses lv and hv e. apparatuses.
2. Switching on in el. circuits.
3. Heat effects of el. current.
4. Force effects of el. current.
5. Switching off in el. circuits without switching arc. Electrical discharges. Switching proccess with el. arc. Recovery voltage.
6. Switching off of opperational and short-circuit currents.
7. Electrical contacts.
8. El. apparatuses without el. arc and operational el. apparatuses. Design and properties.
9. Power el. apparatuses. Design and properties.
10. Instrumental transformes and gaseous insulated systems with SF6.
11. Principles of el. devices protection.
12. Protection of lines against oveload.
13. Protection of lines againts short-circuit currents. Testing of el. apparatuses.
Laboratories and numerical exercising:
1. Switching on of DC and AC currents.
2. Measurement of temperature rise of switching devices
3. Recovery voltage in RLC circuit without el. arc.
4. DC arc characteristics.
5. Measurement on LV circuit breaker.
6. AC arc characteristics.
7. Measurement on thermal relay.
8. Measurement on residual current device (RCD).
9. Protection against overload, time-current characteristics.
10. Protection against short-circuit current, work with computational support.
Identify (describe and explain)
- main phenomena in el. apparatuses,
- function, stress and utilization of el. apparatuses in LV, MV and HV in el. circuits.
Specification of controlled education, way of implementation and compensation for absences
The content and forms of instruction in the evaluated course are specified by a regulation issued by the lecturer responsible for the course and updated for every academic year.
Numerical exercises N1-N4. Each 1 point. Min 2 p., max 4 p.
Laboratory task L1-L8. Each task 2 points. Min. 8 p., max 16 p.
Written test concerning of numerical exercises an laboratory task content. min. 5 p., max 20 p.
Oral examination concerning oof laboratory tasks. There is necessary to succeed.
Written part of examination. Min 30 point, max. 60 points.
Classification of course in study plans
- Programme BPC-SEE Bachelor's, 2. year of study, summer semester, 6 credits, compulsory