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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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Nonplatinum catalysts for polymer exchange membrane fuel cells
Talába, Michal ; Chladil, Ladislav (referee) ; Novák, Vítězslav (advisor)
This work brings a study about non-platinum catalysts, alkaline membranes and methods that interprets catalytic activity. Work deals with a research on non-platinum catalysts based on MnO2 with addition of support substances, measuring of their properties using cyclic voltammetry and hydrodynamics theory. Also a fuel cell measurement of catalytic materials on PVA membrane is executed. The outcome of this work is evaluation of voltammetry and fuel cell measurements. The results of all methods are compared too.
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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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Nonplatinum catalysts for polymer exchange membrane fuel cells
Talába, Michal ; Chladil, Ladislav (referee) ; Novák, Vítězslav (advisor)
This work brings a study about non-platinum catalysts, alkaline membranes and methods that interprets catalytic activity. Work deals with a research on non-platinum catalysts based on MnO2 with addition of support substances, measuring of their properties using cyclic voltammetry and hydrodynamics theory. Also a fuel cell measurement of catalytic materials on PVA membrane is executed. The outcome of this work is evaluation of voltammetry and fuel cell measurements. The results of all methods are compared too.
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