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Current sensor with digitized output signal
Poruban, Milan ; Klusáček, Stanislav (referee) ; Havránek, Zdeněk (advisor)
The main aim of this thesis is to describe principles of measuring of alternating current in low voltage power supply networks with Rogowski coil and study in detail the requirements for electronic current transformer with digital output. Farther confirm the basic parameters of Rogowski coil as an current sensor and creating its alternate electric model. Theoretical part deals issue of measuring alternating current with Rogowski coil, its properties, characteristics, construction and advantages over conventional current transformers of alternating current. There are also listed requirements for alternating current transformers and requirements for their digital output. A/D converters are also discussed. Practical part deals with measuring of parameters of Rogowski coil and creating its alternate electric model. Furthermore, the design and implementation of the input circuit for a pair of A/D converters, which represents a measurement card from NI. Data from the measuring card is processed by the program LabVIEW. The outcome of this thesis is a functional circuit that provides an analog signal pre-processing of Rogowski coils represented by installed PCB designed for 18-bit AD7690 converter and technology demonstrator, which processes the digitized signal from the measuring card.
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Measurement of dry friction coefficient
Meško, Marek ; Brablc, Martin (referee) ; Rubeš, Ondřej (advisor)
This thesis describes modelling of dry friction and determining appropriate friction coefficients. The theoretical part of the thesis is devoted to the basic models of dry friction. The aim of the practical part of this thesis is to create devices for measuring friction coefficients and subsequently to measure the corresponding friction coefficients using these devices.
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Control of system with electric motors by CAN Bus
Hamřík, Petr ; Zuth, Daniel (referee) ; Huzlík, Rostislav (advisor)
The aim of this bachelor's thesis was to work the control of DC motors on already created stands using the CAN BUS. There is a research part in the thesis that deals with the control of DC motors. The DC motor simulation was created in MATLAB Simulink. The last part deals with the physical control of DC motors and the development of the user interface.
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Analysis of the electrical power measurement system in the local distribution network Pod Palackého vrchem
Hájková, Barbora ; Orságová, Jaroslava (referee) ; Jurák, Viktor (advisor)
The diploma thesis introduces a detailed analysis of the local distribution system (LDS) Pod Palackého vrchem (PPV) in the Brno, parameters of power transformers and cable routes between them. The elements of the electrical network that are influencing the balance of reactive power are described along with its sources and appliances. In the next part is defined the present concept of long-term measurement in the LDS by using current and voltage sensors. This part deals with calculations of power losses in the power transformers and the cable lines together with uncertainties concerning power measurement in the field of energetics. The essential part of the thesis focuses on the analysis of the temporary measurement implementation in the LDS, data processing along with the comparison of measured values from temporary measurement with values from permanent measurement. In conclusion, the error of the system is determined.
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Compact Fiber-Optic Current Sensor Utilizing Multiple Modes
Skalský, Michal
In this paper, a simple and compact fiber-optic current sensor utilizing a standard telecom fiber is demonstrated. The sensor employs a Faraday effect introducing a circular birefringence, which is added to a birefringence induced by fiber coiling. The experiments revealed that multi-mode propagation of light with wavelength of 633 nm may exhibited much better sensitivity to the Faraday effect and is less harmed by the parasitic birefringence compared to single-mode beam with 1550 nm.
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Comparison of conventional CT and VT with current and voltage sensors
Dvořák, Petr ; Drápela, Jiří (referee) ; Orságová, Jaroslava (advisor)
The diploma thesis deals with conventional transformers and current and voltage sensors. The first half of thesis describes mainly the basic concepts and accuracy classes of these converters used in electrical substations. The emphasis is given primarily on the differences. In the second half of thesis is presented an exact type of converters, which are installed in the substation Medlánky. There is an analysis of measured data from long – term monitoring from this substation and comparing the results from conventional transformers compared to the results from more modern sensors.
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Measuring of Electricity Consumption Utilizing Current Transformer and Arduino Platform
Pokorný, Rostislav ; Pokorný, Jiří (referee) ; Štůsek, Martin (advisor)
The aim of this bachelor thesis is implementation of non-invasive platform for measuring the consumption and production of electrical power. Developed device enables visualization of measured data on display. Electric current is measured by non-invasive current sensor equipped with split core made of ferrite. Measured data are processed on single board microcomputer called Arduino. The device enables wireless communication with a server platform that allows visualization of measured data in a simple graphical user interface based on the ThingSpeak platform. Created device can measure consumption or production of electrical power on appliance with maximum current up to 30 A without need of any changes in electric circuit.
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Non-standard methods of current and voltage measurements
Talába, Michal ; Boušek, Jaroslav (referee) ; Hubálek, Jaromír (advisor)
This work brings a study about non-conventional methods of voltage and current measurement, followed by a creation of magneto-resistive material based current sensor prototype, suitable for medium voltage switchgear from ABB. Outcome of the study is description of physical principle and the measurement principle of non-conventional methods. Outcome of the experimental part is a current sensor based on magneto-resistive component, which can measure magnetic field generated around a wire with flowing primary current. Through the magnetic field, the sensor can measure primary current flowing in the wire. Sensor was measured in range 0 – 1000 A, and its accuracy and linearity was approximately 6%. The main contribution of this work is the confirmation that this non-conventional method works for measurement of high currents. Based on the outcome, ABB can decide whether is this technology suitable for its product portfolio.
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Current sensor signal processing using microcontroller
Tlustoš, Luboš ; Chytil, Jiří (referee) ; Friedl, Martin (advisor)
In this thesis is described Wiegand wire, current sensor using Wiegand wire effect and processing the output signal from the current sensor using a microcontroller. The document is divided into chapters, each of which are generally described microcontrollers and their applications to signal processing. It also describes the design of circuits for generating sine wave, circuits for appropriate adjustment of the output signals from the sensor current and a draft power source.
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