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Analysis of effects of short-circuit current in switchgear cabinet
Prokop, Jan ; Bušov, Bohuslav (referee) ; Valenta, Jiří (advisor)
The work is focusing on dynamic effects of short-circuit currents, more precisely dynamic effects of short-circuit currents on switchgear cabinet (terminal box). The work was designated to a concrete construction type of two switchgear cabinets located on rotating machines via company Siemens Electric Machines Drásov s.r.o.. The switchgear cabinets are designed for non-explosive environment where the air is used as an insulating medium. The task was to determine how the device will behave during the three-phase short-circuit and three-phase short-circuit with earth/ground connection. The following programs were used for the calculations and simulations: Ansoft Maxwell 16.0, Ansoft Maxwell 2015 and ANSYS Workbench 16.0. By using these programs the effects of forces which acts on current paths in cabinet caused by the passage of short-circuit current were simulated, statically and also dynamically. Further the effects of pressure acting on cabinet frame during the arc short-circuit have been statically and dynamically simulated. All the results are summarized in the conclusion. Conclusion also contains the final evaluation of the functionality of both switchgear cabinets.
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The issue of revision of the electric sliding contact machines
Kozumplík, Miroslav ; Janda, Marcel (referee) ; Veselka, František (advisor)
This work is dealing with issue about revisions of electrical equipment with focused on sliding contact. The first time I will deal enumaration and simple desription the mainly machines which uses sliding contact. The next time i will deal legislation two of standard for revision and then I will write about basic procedures for work with microscope. The next time I will bring photographic documentation of samples of brushes and at the last the strengh test of brushes with results.
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Analysis and design of the AC machines winding.
Vorel, Luboš ; Huzlík, Rostislav (referee) ; Běloušek, Radim (advisor)
This diploma thesis is focused on an analysis and design of an AC machines windings. In the theoretical part of the thesis, differences between single-layer and double-layer windings are explained. Next, the properties of a stator winding of synchronous machines are described. Finally, the winding factor is determined by means of a standard calculation method and by means of a new progressive calculation method, too. In the experimental part of this thesis, the stator winding of a high-speed synchronous generator excited by permanent magnets on the rotor is designed. This generator is driven by a steam turbine.
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The issue of revision of the electric sliding contact machines
Kozumplík, Miroslav ; Janda, Marcel (referee) ; Veselka, František (advisor)
This work is dealing with issue about revisions of electrical equipment with focused on sliding contact. The first time I will deal enumaration and simple desription the mainly machines which uses sliding contact. The next time i will deal legislation two of standard for revision and then I will write about basic procedures for work with microscope. The next time I will bring photographic documentation of samples of brushes and at the last the strengh test of brushes with results.
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Analysis of effects of short-circuit current in switchgear cabinet
Prokop, Jan ; Bušov, Bohuslav (referee) ; Valenta, Jiří (advisor)
The work is focusing on dynamic effects of short-circuit currents, more precisely dynamic effects of short-circuit currents on switchgear cabinet (terminal box). The work was designated to a concrete construction type of two switchgear cabinets located on rotating machines via company Siemens Electric Machines Drásov s.r.o.. The switchgear cabinets are designed for non-explosive environment where the air is used as an insulating medium. The task was to determine how the device will behave during the three-phase short-circuit and three-phase short-circuit with earth/ground connection. The following programs were used for the calculations and simulations: Ansoft Maxwell 16.0, Ansoft Maxwell 2015 and ANSYS Workbench 16.0. By using these programs the effects of forces which acts on current paths in cabinet caused by the passage of short-circuit current were simulated, statically and also dynamically. Further the effects of pressure acting on cabinet frame during the arc short-circuit have been statically and dynamically simulated. All the results are summarized in the conclusion. Conclusion also contains the final evaluation of the functionality of both switchgear cabinets.
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|
|
Analysis and design of the AC machines winding.
Vorel, Luboš ; Huzlík, Rostislav (referee) ; Běloušek, Radim (advisor)
This diploma thesis is focused on an analysis and design of an AC machines windings. In the theoretical part of the thesis, differences between single-layer and double-layer windings are explained. Next, the properties of a stator winding of synchronous machines are described. Finally, the winding factor is determined by means of a standard calculation method and by means of a new progressive calculation method, too. In the experimental part of this thesis, the stator winding of a high-speed synchronous generator excited by permanent magnets on the rotor is designed. This generator is driven by a steam turbine.
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