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Design of a 25 kV traction disconnector
Buchta, Martin ; Bušov, Bohuslav (referee) ; Šimek, David (advisor)
This diploma thesis deals with the design of a traction disconnector for 25 kV AC and a rated current of 800 A. The result should be a competitive disconnector that is capable of potential applications on domestic railways and should have parameters that other local manufacturers do not currently offer. This is, for example, electrical strength or the size of the rated current, which is an economic option for most railway lines in the Czech Republic. According to the proposed drawing documentation, the disconnector was assembled and then the selected disconnector parameters were tested. For example, electrical strength tests, short-circuit tests, constant current tests, etc. were performed. The calculated and measured values were compared together. The designed disconnector was financially and technically evaluated on the basis of test results and the construction itself. Finally, some appropriate adjustments were proposed.
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Computation of thermal network of switchgear type UniGear and comparison with the real temperature rise test
Rybka, Michal ; Tůma, Drahomír (referee) ; Orságová, Jaroslava (advisor)
The Master’s thesis deals with thermal network computation of UniGear type switchgear and it compares the calculated results with the real temperature rise test. The thesis describes both electrical and non-electrical characteristics of such a switchgear as well as its application in variol fields of industry. Description of switchgear auxiliary equipment is obvious part of the thesis. Modelling of current carrying track in software environment of Autodesk Inventor and preparing of this current carrying track for thermal network calculation in software environment of ANSYS follows. Main part of this thesis is presentation of thermal analysis results and their comparison with the real temperature rise test.
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Comparison of the temperature-rise test of low voltage circuit breaker at different operating settings
Kusák, David ; Ing. Kamil Mikyska (OEZ s.r.o.) (referee) ; Dostál, Lukáš (advisor)
The bachelor thesis deals with the evaluation and comparison of the measured values of terminal temperatures of two molded case circuit breakers of the 3VA1 series in different operating settings. temperature rise test is carried out when the device is loaded with rated current and is used to verify whether some parts of the device do not exceed the permissible warm-up value according to the relevant standard. The theoretical part of the thesis focuses on the design, principle of operation and operating states of modular and molded case circuit breakers. Furthermore, a general description of the test conditions of the temperature rise test is presented. In the practical part of this work, 45 temperature rise testand calculation of the power loss of circuit breakers were carried out. breaker series 3VA12
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Design of a 25 kV traction disconnector
Buchta, Martin ; Bušov, Bohuslav (referee) ; Šimek, David (advisor)
This diploma thesis deals with the design of a traction disconnector for 25 kV AC and a rated current of 800 A. The result should be a competitive disconnector that is capable of potential applications on domestic railways and should have parameters that other local manufacturers do not currently offer. This is, for example, electrical strength or the size of the rated current, which is an economic option for most railway lines in the Czech Republic. According to the proposed drawing documentation, the disconnector was assembled and then the selected disconnector parameters were tested. For example, electrical strength tests, short-circuit tests, constant current tests, etc. were performed. The calculated and measured values were compared together. The designed disconnector was financially and technically evaluated on the basis of test results and the construction itself. Finally, some appropriate adjustments were proposed.
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Computation of thermal network of switchgear type UniGear and comparison with the real temperature rise test
Rybka, Michal ; Tůma, Drahomír (referee) ; Orságová, Jaroslava (advisor)
The Master’s thesis deals with thermal network computation of UniGear type switchgear and it compares the calculated results with the real temperature rise test. The thesis describes both electrical and non-electrical characteristics of such a switchgear as well as its application in variol fields of industry. Description of switchgear auxiliary equipment is obvious part of the thesis. Modelling of current carrying track in software environment of Autodesk Inventor and preparing of this current carrying track for thermal network calculation in software environment of ANSYS follows. Main part of this thesis is presentation of thermal analysis results and their comparison with the real temperature rise test.
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