Course detail

Electrical apparatus

FEKT-BEPRAcad. year: 2012/2013

Main state, stress and functions of el. apparatuses, lv and hv e. apparatuses.
Switching on in el. circuits. 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.

Language of instruction

Czech

Number of ECTS credits

6

Mode of study

Not applicable.

Guarantor

doc. Ing. Bohuslav Bušov, CSc.

Department

Department of Power Electrical and Electronic Engineering (UVEE)

Learning outcomes of the course unit

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.
Students can (are able):
- measure and interpet results of 8th laboratory exercises,
- interpret results of 4th numerical task.

Prerequisites

Students have to know:
Atom composition. Bases electrical field. Scalar and vector product. Bases of magnetic field. Force acting on charge and wires. Laws of electrotechnics (Coulomb, Ohm, Faraday, Amper). Differential equation descibing circuits RL, RC, RLC. Basic transition phenomena in circuits. Goniometric functions. Integral function of one variable.

Co-requisites

Not applicable.

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).

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.

Course curriculum

Lectures
1. Main functions of el. apparatuses lv and hv el. 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.
Laboratories:
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 characteristic.
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.

Work placements

Not applicable.

Aims

Not applicable.

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.

Written part of examination. Min 30 point, max. 60 points.

Recommended optional programme components

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

Browne,T.,E.: Circuit interruption,N.York,1984.
Havelka, O. a kol.: Elektrické přístroje, SNTL, 1985.

Recommended reading

Vávra, Z., Vaněk, J.: Vysoké napětí a elektrické přístroje, Laboratorní a numerická cvičení, Část II: Elektrické přístroje, elektronický text, FEKT VUT v Brně, 2003.

Classification of course in study plans

  • Programme EECC Bc. Bachelor's

    branch B-SEE , 2 year of study, summer semester, compulsory

  • Programme EEKR-CZV lifelong learning

    branch EE-FLE , 1 year of study, summer semester, compulsory

Type of course unit

 

Lecture

39 hod., optionally

Teacher / Lecturer

Ing. Jiří Valenta, Ph.D.
doc. Ing. Bohuslav Bušov, CSc.

Syllabus

1. Main functions el. apparatuses lv and hv.
2. Switching on in el. circuits.
3. Heat effect of current.
4. Force effect of current.
5. Switching off in el. circuits without switching arc. Electrical discharges. Switching proccess with el. arc. Recovery voltage.
6. Switching off opperational and short currents.
7. Electrical contacts.
8. Simple and operational el. apparatuses. Design and properties. 9. Power el. apparatuses. Design and properties.
10. Measure transformes and gaseous insulated systems with SF6.
11. Principles of el. equipment protection.
12. Protection against electric line overloading.
13. Protection electric line against short currents.

Laboratories:
1. Switching on DC and AC currents.

2. Measurement of el. apparatus heating curve.
3. Recovery voltage in RLC circuit without el. arc.
4. Measurement of DC arc characteristics.
5. Measurement on circuit breaker.

6. Measurement of AC arc characteristic.
7. Measurement on thermal relay.
8. Measurement on residual current device.
9. Measurement on electromagnet.

10. Design of electrical installation.
11. Protection against overloading, time-current characteristics.
12. Protection against short current, setting of modern devices.

Laboratory exercise

26 hod., compulsory

Teacher / Lecturer

Ing. Petr Dohnal, Ph.D.
Ing. Jiří Valenta, Ph.D.
doc. Ing. Bohuslav Bušov, CSc.
Ing. Lukáš Mišinger
Ing. Lukáš Dostál, Ph.D.

Syllabus

Laboratories:
N1. Switching on DC and AC currents.

L1. Measurement of el. apparatus heating curve.
L2. Recovery voltage in RLC circuit without el. arc.
L3. Measurement of DC arc characteristics.
L4. Measurement on circuit breaker.

L5. Measurement of AC arc characteristic.
L6. Measurement on thermal relay.
L7. Measurement on residual current device.
L8. Measurement on electromagnet, tensile forces.

N2. Circuit breakers and software support for system designers.
N3. Protection against overloading, time-current characteristics.
N4. Protection against short current, setting of modern devices.