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DISCONNECTOR PARALLEL CURRENT PATHS OPTIMIZATION
Görig, Tomáš ; Tůma, Jan (referee) ; Dohnal, Petr (advisor)
The objective of this master´s thesis is diagnostic the actual disconnector current path that is unevenly stressed by nominal current. The most stressed parts are excessively heated. In next part are projected a few options to optimize the current path. The options are verified by simulation. The best option is recommended to the submitter.
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Calculation of electrodynamic forces in 250 A circuit breaker
Görig, Michal ; Dohnal, Petr (referee) ; Valenta, Jiří (advisor)
This master’s thesis deals with the calculation of electrodynamic forces breaker BD250NE305. Main tasks in this semester project is to study the theoretical analysis of individual parts specified breakers. Processing theoretical analysis of these forces. Creating a 3D model current path and sheets quenching chamber single phase circuit breaker in Autodesk Inventor Professional 2012. Another challenge is the subsequent export the model into the simulation program ANSYS Maxwell. After simulation, the specified conditions must be processed and the results of the present work is to evaluate.
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Dimensioning of current-currying way of electrical apparatuses
Šic, Pavel ; Dostál, Lukáš (referee) ; Bušov, Bohuslav (advisor)
Bachelor‘s thesis is focuses on the issue of designing electrical switching devices, especially dimensioning of the current-carrying paths according to the effects of electrodynamic forces. There are dimensioning requirements for current carrying paths of switching devices in the introductory chapter. Fundamental requirements are: sufficient dielectric strength between parts at different potential, resistance to thermal effects of electric current and current path arrangement considering electrodynamic forces. Typical current path arrangements of electrical apparatuses are justified in second chapter. Furthermore, the actual problems to solve are formulated, corresponding with the development of technical solutions. Emphasis is laid upon proper description of modifications of the proposal so to limit their negative impact of secondary phenomena such as electrodynamic forces or thermal effects. The best solutions then directly positively use these phenomena. The present progressive technical solutions retrieved in a patented state of the art using Goldfire Innovator software are described in the third chapter. The work is then focused on rotary contact arrangement patents from the very first, through the pioneering patent to the present. Hereinafter are described the features of the evolution of technology development – micro and macrosegmentation. In the last chapter, there are analytically calculated electrodynamic forces acting on the contact arm of low voltage circuit breaker in both open and closed state and medium voltage disconnector. Both technical solutions are evaluated due to given requirements.
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Calculation of electrodynamic forces in 630 A circuit breaker
Staněk, Pavel ; Bušov, Bohuslav (referee) ; Valenta, Jiří (advisor)
The aim of this thesis is to simulate the action of electrodynamic forces on current carrying path and a movable contact of the circuit breaker OEZ Modeion BH 630NE. For the calculation there is used the simulation program Ansys Maxwell. The first part is devoted to theoretical analysis of electromagnetic forces on a conductor in a magnetic field. Further I discuss the constructional design of the circuit breaker itself, especially the current path and the contact mechanism. In the next part there is (with using program Autodesk Inventor) created a simplified 3D model of the current path including an arc chamber. With program Ansys Maxwell then there is performed simulation of the acting of forces in each mode. This is magnetostatic and transient analysis for symmetrical and asymmetrical flow of the fault current. In conclusion the results obtained are evaluated and processed in the tabular way.
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Electrodynamic forces acting on moving contact of electrical apparatus
Šic, Pavel ; Valenta, Jiří (referee) ; Bušov, Bohuslav (advisor)
This master’s thesis is focused on calculation, simulation and experimental verification of electrodynamic forces acting upon movable contact piece of MCCB and experimental current carrying path. A short description of low voltage circuit breakers is briefly discussed in first chapter. Second chapter is focused upon contact system analysis of particular MCCB with thermomagnetic trigger. A hardness of contact materials is briefly described. A detailed analytical calculations were used to determine electrodynamic forces in MCCB. A FEM simulation in ANSYS Maxwell was carried out for comparison with analytical results. An experimental apparatus was designed and built for verification of constriction repulsion force, so called Holm’s force. A series of measurements is subsequently performed on proposed apparatus and results are compared with results from previous chapters.
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|
|
Dimensioning of current-currying way of electrical apparatuses
Šic, Pavel ; Dostál, Lukáš (referee) ; Bušov, Bohuslav (advisor)
Bachelor‘s thesis is focuses on the issue of designing electrical switching devices, especially dimensioning of the current-carrying paths according to the effects of electrodynamic forces. There are dimensioning requirements for current carrying paths of switching devices in the introductory chapter. Fundamental requirements are: sufficient dielectric strength between parts at different potential, resistance to thermal effects of electric current and current path arrangement considering electrodynamic forces. Typical current path arrangements of electrical apparatuses are justified in second chapter. Furthermore, the actual problems to solve are formulated, corresponding with the development of technical solutions. Emphasis is laid upon proper description of modifications of the proposal so to limit their negative impact of secondary phenomena such as electrodynamic forces or thermal effects. The best solutions then directly positively use these phenomena. The present progressive technical solutions retrieved in a patented state of the art using Goldfire Innovator software are described in the third chapter. The work is then focused on rotary contact arrangement patents from the very first, through the pioneering patent to the present. Hereinafter are described the features of the evolution of technology development – micro and macrosegmentation. In the last chapter, there are analytically calculated electrodynamic forces acting on the contact arm of low voltage circuit breaker in both open and closed state and medium voltage disconnector. Both technical solutions are evaluated due to given requirements.
|
|
|
Calculation of electrodynamic forces in 630 A circuit breaker
Staněk, Pavel ; Bušov, Bohuslav (referee) ; Valenta, Jiří (advisor)
The aim of this thesis is to simulate the action of electrodynamic forces on current carrying path and a movable contact of the circuit breaker OEZ Modeion BH 630NE. For the calculation there is used the simulation program Ansys Maxwell. The first part is devoted to theoretical analysis of electromagnetic forces on a conductor in a magnetic field. Further I discuss the constructional design of the circuit breaker itself, especially the current path and the contact mechanism. In the next part there is (with using program Autodesk Inventor) created a simplified 3D model of the current path including an arc chamber. With program Ansys Maxwell then there is performed simulation of the acting of forces in each mode. This is magnetostatic and transient analysis for symmetrical and asymmetrical flow of the fault current. In conclusion the results obtained are evaluated and processed in the tabular way.
|
|
|
Electrodynamic forces acting on moving contact of electrical apparatus
Šic, Pavel ; Valenta, Jiří (referee) ; Bušov, Bohuslav (advisor)
This master’s thesis is focused on calculation, simulation and experimental verification of electrodynamic forces acting upon movable contact piece of MCCB and experimental current carrying path. A short description of low voltage circuit breakers is briefly discussed in first chapter. Second chapter is focused upon contact system analysis of particular MCCB with thermomagnetic trigger. A hardness of contact materials is briefly described. A detailed analytical calculations were used to determine electrodynamic forces in MCCB. A FEM simulation in ANSYS Maxwell was carried out for comparison with analytical results. An experimental apparatus was designed and built for verification of constriction repulsion force, so called Holm’s force. A series of measurements is subsequently performed on proposed apparatus and results are compared with results from previous chapters.
|
|
|
Calculation of electrodynamic forces in 250 A circuit breaker
Görig, Michal ; Dohnal, Petr (referee) ; Valenta, Jiří (advisor)
This master’s thesis deals with the calculation of electrodynamic forces breaker BD250NE305. Main tasks in this semester project is to study the theoretical analysis of individual parts specified breakers. Processing theoretical analysis of these forces. Creating a 3D model current path and sheets quenching chamber single phase circuit breaker in Autodesk Inventor Professional 2012. Another challenge is the subsequent export the model into the simulation program ANSYS Maxwell. After simulation, the specified conditions must be processed and the results of the present work is to evaluate.
|
|
|
DISCONNECTOR PARALLEL CURRENT PATHS OPTIMIZATION
Görig, Tomáš ; Tůma, Jan (referee) ; Dohnal, Petr (advisor)
The objective of this master´s thesis is diagnostic the actual disconnector current path that is unevenly stressed by nominal current. The most stressed parts are excessively heated. In next part are projected a few options to optimize the current path. The options are verified by simulation. The best option is recommended to the submitter.
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