Course detail

Electrical apparatus

FEKT-CEPRAcad. year: 2017/2018

Main topics of the course:

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.

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.

Prerequisites

Student who will book this course should to know basic physical and electrotechnical priciples and mathematical operation. Atom. 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.

Co-requisites

Not applicable.

Recommended optional programme components

Not applicable.

Recommended or required reading

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.
4. All text available in E-learning.

Assesment methods and criteria linked to learning outcomes

Not applicable.

Language of instruction

English

Work placements

Not applicable.

Course curriculum

Lectures
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.
Laboratories:
1. Switching on of DC and AC currents.
2. Measurement of teperature 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.

Aims

Identify (describe and explain)
- main phenomena in el. apparatuses,
- function, stress and utilization of el. apparatuses in LV, MV and HV in el. circuits.

Classification of course in study plans

  • Programme EEKR-BC Bachelor's

    branch BC-SEE , 2. year of study, summer semester, 6 credits, compulsory

Type of course unit

 

Lecture

39 hours, optionally

Teacher / Lecturer

Laboratory exercise

26 hours, compulsory

Teacher / Lecturer