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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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Electical stimulation of hand muscles
Hrozáň, Michal ; Balogh, Jaroslav (referee) ; Sekora, Jiří (advisor)
Bachelor thesis explains the effect of electrical stimulation on muscle and nerve fiber. It describes the process of stimulation and principles that apply while stimulation with electric current is applied. Specific muscle stimulation of thumb is described. Work provides a solid base of knowledge for understanding the processes that are present in stimulation of living tissue, which will be implemented in construction of stimulator. User graphical interface was created in Matlab. User can communicate using this program with microcontroller ATMega328 of Arduino Uno Board. Microcontroller processes received data and generates voltage on its output pins. An amplifier and electrode triggering system was designed as well.
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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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Electical stimulation of hand muscles
Hrozáň, Michal ; Balogh, Jaroslav (referee) ; Sekora, Jiří (advisor)
Bachelor thesis explains the effect of electrical stimulation on muscle and nerve fiber. It describes the process of stimulation and principles that apply while stimulation with electric current is applied. Specific muscle stimulation of thumb is described. Work provides a solid base of knowledge for understanding the processes that are present in stimulation of living tissue, which will be implemented in construction of stimulator. User graphical interface was created in Matlab. User can communicate using this program with microcontroller ATMega328 of Arduino Uno Board. Microcontroller processes received data and generates voltage on its output pins. An amplifier and electrode triggering system was designed as well.
|
|
|
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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