Ing. Jiří Valenta, Ph.D.

Department of Power Electrical and Electronic Engineering (UVEE)

Students can describe:
- principal of function of various protective devices
- principals of protection against overcurrents for individual kinds of devices
- principals of selectivity determination
- principals of protection against electric shock
- principals of overvoltage protection

Students can explain
- meaning of parameters of protective devices
- phonemena influencing design of protection for electric devices
- kinds of selectivity between protective devices
- principals of individual protective provisions for protective measure automatic disconnection of supply
- overvoltage origin and protection against it

Students are able to design
- cables protection against overload and short circuit
- protection of motors and inlets to them
- protection of transformers
- protection of semiconductors
- protection of capacitive bateries
- selectively connected protection devices in series
- electric circuit from the automatic disconnection of supply point of view
- individual levels of overvoltage protection

Students are able to analyse
- effects influencing protection of electric devices
- effetcts of short-circuit currents
- appropriate usage of protective devices

Students are able to judge
- correctness of overcurrent protection of electric devices
- selectivity between protective devices
- protection of surge arrestors
- fulfillment of conditions for protective measure automatic disconnection of supply

Students are able to compose
- report concerning protection of electric devices
- protocol on short circuit calculation
- protokol on measurement of important parameters of protective devices

The subject knowledge on the Bachelor´s degree level is requested. Requested knowledge: - to solve electrical circuits by the method of circuit simplification and nodes potentials - knowledge of electrodynamic forces effects and calculation - knowledge of thermal effects of electric currents in steady state and during transient period - calculation of short-circuit currents in LV networks - classification of electrical switching devices based on the ability to switch various currents - phonemena during motor start - function of a transformer - knowledge of regulation 50/1978 Sb.

Not applicable.

Not applicable.

Brittian L.W.: Electrical Circuit Breakers, Fuses, Protective Relays, and More (EN)
Flurscheim C.H.: Power Circuit Breaker Theory and Design (Energy Engineering) (EN)
Ragunath Ram: Electrical Protection Systems & Units: Protection Devices Guide (EN)

Teaching methods depend on the type of course unit as specified in the article 7 of BUT Rules for Studies and Examinations.
1. Lectures on each subjects (P1-P13).
2. Lectures are practised during numerical, computer and laboratory tasks every week.
3. All texts are available in faculty system.

exam - 100 points

English

Not applicable.

1. Kinds and origin of faults in electric devices
2. Parameters and characteristics of fuses
3. Parameters and characteristics of circuit breakers and other protective devices
4. Wires protection against overload
5. Calculation of short-circuit currents and wires protection against short-circuit currents.
6. Motor and motor inlets protection
7. Transformer protection
8. Protection of semiconductors and other devices
9. Protection of capacitor bateries, usage of switchgears in switchgear assemblies
10. Selectivity between protective devices
11. Protection against electric shock
12. Protection against overvoltage
13. Excursion

Students will understand characteristics of electrical protective devices and their usage for protection of individual types of electrical devices.

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.

• Programme MPA-EEN Master's, 2. year of study, winter semester, 6 credits, compulsory-optional
  

22 hours, optionally

Ing. Jiří Valenta, Ph.D.