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Power Circuit Switching Devices SIE301

ECTS 5 | P 30 | A 15 | L 15 | K 0 | ISVU 41108 149376 | Academic year: 2020./2021.

Course groups

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Course lecturers


Course description

Application, type and development of switching devices. Breaker, switch, contactor, disconnector and switchgear. Different construction conditions. Modern development tendencies. Switching network conditions. Switching phenomenon in short circuits. Switching of a three phase short circuit. Switching of asymmetrical short circuits. Influence of neutral grounding. Transient return voltage. Short circuits on short power lines. Load and switching operation in system (load factor influence). Single phase switching operation. Switching on and automatic restart with time delay. Switching of reactive current (current cutting phenomenon). Switching of capacitor bank. Electrical arc physics. Electrical arc in different matter. Electrical arc in vacuum. Electrical and magnetising arc characteristics. Heat signature of electrical arc. Switches - types of constructions, area of application, selection, mounting, maintenance and replacement. Air switches (pneumatic). Oil switches. SF6 switches. Vacuum switches. Disconnector. Fuse. Contactors. Surge arrestors. Switching devices remote operation and controll. Switching devices as a compact switchgear system.

Knowledge and skills acquired

Students will learn about a physical image of the occurrence associated with the formation, parameters and extinguishing an electric arc. Determination of the characteristics of a switchgear and its location. Approaches to the maintenance of a switchgear and the solution of actual examples in a design process.

Teaching methods

Lectures, laboratory exercises and auditory exercises.

Student assessment


Obligatory literature

1. 1 B. Belin Uvod u teoriju električnih sklopnih aparata Školska knjiga, Zagreb 1978.

Pretraži literaturu na:

Recommended additional literature

1. 1 Flurscheim C.H. Power Circuit Breakers - theory and design Peter Peregrinus, Ltd., London 1975.

2. 2 Ragaller K. Current Interuption in HV Networks Plenum Press, New York, 1980.

3. 3 CIGRE WG 13.06 Final report of the Second International Enquiry on High Voltage Circuit-Breaker Failures and Defect

4. 4 Clegg B., Ewart G., Brankin F. Advances in Cicuit Breaker testing and condition monitoring, Proceedings IEE Monitors and condition assessment equipment IEE digest No. 186, 1996.

Examination methods

Written and oral exam.

Course assessment

Students’ questionnaire.

Overview of course assesment

Learning outcomes
Upon successful completion of the course, students will be able to:

1. understand the basic concepts related to the role, performance and purpose of circuit breakers in the power system, thermal and electrodynamic stresses, and occurence, transient voltage characteristics and switchgear characteristics relevant to the choice

2. analyse the basic concepts referring to the nature of the electrical arc opening and disconnection in the switchgear, the electrical breakdown in gaseous media, and concepts related to contact theory

3. evaluate basic laws, mathematical expressions and mathematical models for solving simple problems related to thermal and electrodynamic stresses in the switchgear, the fundamentals of contact theory and the choice of switchgear for installation in the pow

4. assess the problems of the impact of switching operations in the power grid with emphasis on transient feedback voltage and its features

5. evaluate a computer simulation for selecting a switchgear in the power network in a suitable software package for solving transient phenomena caused by switching operations

6. analytically and numerically solve simpler problems related to thermal and electrode dynamics of a switchgear, the basis of contact theory and the basic transient return voltage parameters

Aktivnosti studenta: Vidi tablicu aktivnosti