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Residual current device behavior under switching of non-sinusoidal residual currents
Horký, Jakub ; Dostál, Lukáš (referee) ; Valenta, Jiří (advisor)
This bachelor deals with behaviour of a residual-current device during disconnection non-sinusoidal residual current. In the first, theoretical part, basic characteristics and properties of electrical devices are described. Attention is devoted to residual-current device, its structural part, parameters and types. Afterwards, there are described normative requirements of the residual-current device type A in the course of tests. The second part is a practical part. The residual-current device is subjected to residual currents with direct current components (according to the standard), thereby it is checked if it works correctly, it means, if the device is capable of being cut off, At the end of the bachelor, where is a sample laboratory task that demonstrates a check the behavior of the residual-current device at switching off the non-sinusoidal current.
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The Model of HVDC Line for Laboratory
Mička, Dominik ; Paar, Martin (referee) ; Krbal, Michal (advisor)
The objective of this bachelor thesis is to provide comprehensive information of HDVC transmission and to create laboratory model of HVDC connection. The first part of the thesis presents its pros and cons and provides basic description of individual parts related to the transmission of electrical energy. The thesis also shows proposed design model of HVDC connection, used as a guidance for work in lab environment. Provided are calculated parameters and operational options of working prototype model. Subsequently, the prototype is created and measured test results are compared against calculated and simulated values.
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Short Circuit Currents in DC Systems
Kolařík, Robin ; Geschwinder, Lukáš (referee) ; Paar, Martin (advisor)
The bachelor thesis deals with the analysis of short-circuit currents in DC systems. The thesis introduces the possibility of application of low voltage DC distribution in commercial and industrial buildings. The second part is focused to high voltage direct current transmission. The practical part deals with the calculation of short-circuit currents of individual elements and subsequently with short-circuit conditions in the DC network. At the end of the work are evaluated advantages and disadvantages between AC and DC voltage and suitability of use in given areas.
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Critical d.c. load current test of low-voltage devices
Fůsková, Karolína ; Ing. Zdeněk Mlynář (OEZ s.r.o.) (referee) ; Dostál, Lukáš (advisor)
This thesis deals with problems connected with circuit breakers for direct current. It explains mechanism and construction of small circuit breakers and molded case circuit breakers (MCCB) focusing on the using in AC and DC circuits. There is also explained direct current and related issues. For example, issue with DC arc breaking. An important part of this work is high-speed camera measurement of critical direct current and short circuit breaking with subsequent evaluation with PFV tool. The important part of this thesis is assessment of the critical load current for used circuit breakers
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Residual current device behavior under switching of non-sinusoidal residual currents
Horký, Jakub ; Dostál, Lukáš (referee) ; Valenta, Jiří (advisor)
This bachelor deals with behaviour of a residual-current device during disconnection non-sinusoidal residual current. In the first, theoretical part, basic characteristics and properties of electrical devices are described. Attention is devoted to residual-current device, its structural part, parameters and types. Afterwards, there are described normative requirements of the residual-current device type A in the course of tests. The second part is a practical part. The residual-current device is subjected to residual currents with direct current components (according to the standard), thereby it is checked if it works correctly, it means, if the device is capable of being cut off, At the end of the bachelor, where is a sample laboratory task that demonstrates a check the behavior of the residual-current device at switching off the non-sinusoidal current.
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Short Circuit Currents in DC Systems
Kolařík, Robin ; Geschwinder, Lukáš (referee) ; Paar, Martin (advisor)
The bachelor thesis deals with the analysis of short-circuit currents in DC systems. The thesis introduces the possibility of application of low voltage DC distribution in commercial and industrial buildings. The second part is focused to high voltage direct current transmission. The practical part deals with the calculation of short-circuit currents of individual elements and subsequently with short-circuit conditions in the DC network. At the end of the work are evaluated advantages and disadvantages between AC and DC voltage and suitability of use in given areas.
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The Model of HVDC Line for Laboratory
Mička, Dominik ; Paar, Martin (referee) ; Krbal, Michal (advisor)
The objective of this bachelor thesis is to provide comprehensive information of HDVC transmission and to create laboratory model of HVDC connection. The first part of the thesis presents its pros and cons and provides basic description of individual parts related to the transmission of electrical energy. The thesis also shows proposed design model of HVDC connection, used as a guidance for work in lab environment. Provided are calculated parameters and operational options of working prototype model. Subsequently, the prototype is created and measured test results are compared against calculated and simulated values.
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Direct Current Electronic Circuits Editor
Elis, Martin ; Kopřiva, Jan (referee) ; Kunovský, Jiří (advisor)
The main task of this work was to develop a simple intuitive editor of electrical circuits able of analysis its designed schemes. Application should be designed as a supporting studying material for students of circuit theory course for better understanding of learned techniques for solving electrical circuits. That's why implemented analysis should stand with procedures of solving electrical circuits, which are taught in this course, concretely mesh-current analysis and node-voltage analysis. Another important task was development of transparent structure for electrical schemes storing in xml format. The last objective was to compare efficiency of this application and similar programs for solving electrical circuits.
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