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Lecturer(s)
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Olkhovskiy Mikhail, Ing.
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Sedláček Jan, Ing. Ph.D.
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Jiřičková Jana, Ing. Ph.D.
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Noháčová Lucie, Doc. Ing. Ph.D.
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Mužík Václav, Ing. Ph.D.
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Mašata David, Ing.
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Zmeko Filip, Ing.
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Course content
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1. Definition of the term electrical apparatus, main parameters of electrical apparatus, sorting of electrical apparatus (according to main parameters, purpose and function), introduction of individual groups of apparatus. 2. General structure of the electrical apparatus, requirements for electrical apparatus in terms of operating and fault conditions in the electrical network. 3. Heating of the current path of electrical devices by electric current, short and continuous, calculation methods. Force effects of electric current on the current path of electrical apparatus (contacts, fold, coil, change of cross section, adynamic solutions). 4. Analysis of electrical contact problems, contact resistance, theory of electrical contacts, properties and parameters of contacts, methodology of design of contacts. 5. Electrical discharges, spark discharge and switching electric arc, physical processes, dissociation and ionization, basic characteristics, dynamic arc. 6. Basic types of switching electrical apparatus, their functions, parameters and applications. Design solutions and drives. 7. Swithcing principles and their historical development, quenching media, physical processes, operating properties and parameters. 8. Switching in AC circuits, general characteristics, time courses and intervals. 9. Synthetic tests, test disciplines. Terminal and short line faults. Switching off small inductive and capacitive currents, synchronized switching. 10. Switching in DC circuits, rated currents and short-circuit currents, high speed switches. 11. Overvoltage protection, overvoltage types and their parameters, principles of overvoltage protection, overview of used devices, their design and properties. 12. Issues of protection against overcurrents and short circuit currents, basic methods of protection. Low voltage circuits protection, principles and characteristics of protective apparatus and devices. Setting up of protective devices according to their switching characteristics, selectivity and reliability of the protection. 13. Voltage and current instrument transformers. Classification by use, principles, parameters. Design, substitution diagram and characteristics of conventional instrument transformers with ferromagnetic circuit. Other types of voltage and current instrument transformers.
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Learning activities and teaching methods
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- Preparation for laboratory testing; outcome analysis (1-8)
- 8 hours per semester
- Preparation for comprehensive test (10-40)
- 20 hours per semester
- Presentation preparation (report) (1-10)
- 10 hours per semester
- Contact hours
- 39 hours per semester
- unspecified
- 27 hours per semester
- Contact hours
- 12 hours per semester
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| prerequisite |
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| Knowledge |
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| to describe the basic properties of the electromagnetic field |
| to explain transient phenomena in simple circuits |
| Skills |
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| to apply the basics of university mathematics |
| to assemble simple electrical circuits |
| to measure basic electrical quantities |
| Competences |
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| N/A |
| learning outcomes |
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| Knowledge |
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| to explain the purpose and use of electrical apparatus, to state their basic groups |
| to describe the basic components of electrical apparatus |
| to explain the current path requirements of electrical apparatus in terms of heating and force effects of current |
| to describe and explain phenomena on electrical contacts, explain the concept of contact resistance |
| to explain the physical processes leading to the occurrence of spark discharge and electric arc, to give the basic arc characteristics |
| to list basic types of switching electrical apparatus, explain their function and use |
| to state basic principles of switching in AC and DC circuits |
| to explain the historical development of the switches and to specify the current types of circuit breakers in the AC circuits and their switching capabilities |
| to draw and describe the timing of the switching process in AC circuits |
| to explain basic switching tests of power circuit breakers: terminal and short line fault, switching off of small inductive and capacitive currents |
| to draw and describe the timing of the switching process in DC circuits, to explain the concept of a high speed switch |
| to state the types of overvoltages in depenedency on time duration and their basic parameters |
| to explain the principle of surge protection, to state the basic surge protections types and their basic parameters |
| to explain the relation of the current path heating characteristics and the switching characteristics of the protective device |
| to explain two basic methods of protection against overcurrents and short circuits currents |
| to name the basic safety devices in the low-voltage circuits and to draw their switching characteristics |
| to explain the function of instrument transformers and their basic groups, to give basic types of instrument transformers |
| Skills |
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| according to the instructions to assemble the test circuits of laboratory tasks from electrical apparatus |
| to perform your own measurement of laboratory tasks from electrical apparatus |
| to evaluate measurement results and process measurement reports including final evaluation |
| teaching methods |
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| Knowledge |
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| Lecture |
| Interactive lecture |
| Skills |
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| Practicum |
| Laboratory work |
| Individual study |
| assessment methods |
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| Knowledge |
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| Test |
| Skills |
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| Skills demonstration during practicum |
| Individual presentation at a seminar |
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Recommended literature
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Bárta, K., Vostracký, Z. a kol. Spínací přístroje velmi vysolého napětí. SNTL, Alfa, Praha, 1983.
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Grigsby, Leonard L., ed. The electric power engineering handbook. 3rd ed.. Boca Raton: CRC Press, 2012. ISBN 978-1-4398-5635-2.
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Kříž, Michal. Dimenzování a jištění elektrických zařízení - tabulky a příklady. Čtvrté aktualizované vydání.. Pardubice IN-EL, 2015. ISBN 978-80-87942-07-9.
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Rusňák, Štěpán; Řezáček, Petr. Elektrické přístroje. 1. 2., přeprac. vyd. Plzeň : Západočeská univerzita, 2001. ISBN 80-7082-825-0.
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