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Calculation of heat and force field UniGear ZS1
Mokrý, Lukáš ; ABB, Drahomír Tůma, (referee) ; Dohnal, Petr (advisor)
The aim of my work is to describe high-voltage switchgear type UniGear 500R, which is part of UniGear switchgears family. I will focus on heating issue of one 500R unit and its parts during operation. Maximum values of this heating is limited by standards and can´t be exceed to ensure safe and reliable operation. That is why the heating tests are necessary part of designing and developing switchgears. Calculation will be made by two different ways. First is classic one-pole heating net method and second is numerical simulation in Solidworks flow simulation program. Except the theoretical description there will be presented also used 3D model and explanation of both method, used to calculation and simulation. Last point of this work is measuring of this type of switchgear and getting real data. The main point there is to compare measured values with values calculated and decide if is possible to simulate tests with appropriate accuracy. Then would be also possible to substitute the real test in laboratory, which costs many thousand crowns and takes lots hours of time. This work is collaborated with EJF division of ABB Company, where I am employed. Heating issues in this company is always on process, because of developing and improving of their products. So this work could be helpful in this field. ABB provides all materials needed, especially technical catalogues, 3D model and final values from laboratory measuring. Support from college faculty is mainly in study consultations and proposing of calculations making. In the end of work will be make final comparison and evaluation of achieved results.
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Extensible measurement socket placement optimalization with respect to the higher number of conductors
Šindler, Matěj ; Čepička, Martin (referee) ; Wasserbauer, Vojtěch (advisor)
In opening, this bachelor thesis is describing structure and basic block description of UniGear switchgear manufactured by ABB company. Then this thesis focus on current and voltage transformers and sensors often used in this type of switchgear. Main part of this thesis is dedicated to evolution and description of connector, used in connection solution of withdrawable metering unit with low-voltage compartment. Next part states the main requirements for new connector, that will replace current connector in future solution. In following part there is a list of different options for new connector with their biggest strengths and weaknesses pointed out. Then there is list of alternative placements for new connector. In final part is chosen and described new connector and its placement. This solution is valuated and backed up by created 3D models.
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Development of monitoring device for voltage instrument transformes
Marčok, Samuel ; Odehnal, Martin (referee) ; Bušov, Bohuslav (advisor)
The topic of this bachelor thesis is instrument transformers and development of monitoring device for service purposes. The first chapter of this work is dedicated to a theoretical functionality of instrument transformers. It also deals with the instrument transformer as a separate unit according to norm EN 61869-1. Next chapter depicts instrumental transformer as a part of switchgear UniGear ZS1 (a product of ABB) and its standard working conditions. The results of these two separate chapters are two views of the instrument transformer, the first as a separate device and the second as part of the unit (switchgear), which in each case must be adapted to different conditions. A separate chapter describes the effects of temperature, humidity, pressure, altitude, vibration and discharges on the instrument transformer. The work further explains the physical nature of selected quantities and describes the methods of their monitoring. The conclusion of the work is a summary of the acquired knowledge and a brief overview of the results of the work.
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Simulation of electric field in the area of switchgear busbars
Müller, Michal ; Janda, Marcel (referee) ; Bušov, Bohuslav (advisor)
The aim of this work is to simulate the electric field in the space of busbar HV switchgear. More precisely, the aim is to find a place with the most critical value of the electric field, the design of measures to reduce the size of the field at this point. The simulation was performed using the finite element method program. The simulation found the most critical area. Using the basic physical principles it has been proposed solution. This solution reduced twice the magnitude the electric field in this area.
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Design the Transformer Station for the Outgoing Power of Cogeneration Unit
Pastorek, Jaroslav ; Procházka, Aleš (referee) ; Orságová, Jaroslava (advisor)
The thesis deals with the design of a transformer station for the outgoing power of cogeneration unit with an electric capacity of up to 1 MW. The thesis describes the design procedure of individual devices such as a transformer with a nominal ratio 22/0,4 kV, high voltage switchgears and low voltage switchgears. With the proper selection of the transformer, along with the technical parameters, the economic benefits that come from its purchasing and operating costs with the transformer operation are also considered. Based on this, the economic comparison of selected types of oil transformers during 20 years is also developed. Another part of the thesis deals with HV and LV switchgears, which are dimensioned according to shortcircuit conditions in the transformer station. In conclusion this work deals with the grounding of a transformer station and design protection in accordance PPDS.
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Design of overvoltage arresters in high voltage switchgear depending up parameters of connected load
Němec, Ondřej ; Bernard, Michal (referee) ; Lázničková, Ilona (advisor)
The purpose of this thesis is to introduce the reader about the problems of design of surge arresters. The first part of this thesis describes problems of surge. In the next part of this thesis are described test pulses needed to test surge arresters. The next issues of this thesis are medium voltage switchgears and surge arresters ABB and their test. In the next part ot this thesis are described type of network according earthing of transformers. The other point of this thesis are aplications of surge arresters, figures and calculation for networks, generators, transformers and motors. In the conclusion of this thesis is the appreciation of whole problems about surge arresters.
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Monitoring of partial discharges and their minimization in switchgear UG ZS1
Bajánek, Tomáš ; Bernard, Michal (referee) ; Lázničková, Ilona (advisor)
Bachelor's thesis deals with partial discharges which occur in switchgear ABB UniGear ZS1. The work deals with the theoretical analysis of partial discharge, a description of the parameters and possibilities of measuring partial discharges. It deals with the description of switchgear as an electrical equipment and analysis of the places where it may lead to formation of partial discharges. The work contains a description of the laboratory for measurement of partial discharges in the company ABB, description of measuring equipment LDS-6 and basic project of optimization of partial discharges in switchgear ABB UniGear ZS1.
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Design of switchgear system
Róža, Štefan ; Slavata, Petr (referee) ; Kadlec, Radim (advisor)
The thesis depicts the substation of low voltage switchgear design (nn) based on the back scheme of its connection. In the first part of the switchgear design nn the thesis deals with the adjustment of the back connection scheme and its analysis necessary for continuation of its switchgear designing. The main part of the thesis describes the scheme creation in a computer program, the implementation of certain computations requisite for safe and failure-free operation of the station. Here, the thesis points out the solutions of conditions, where the back scheme does not agree with the calculated results. The circuit was tested for voltage drop and load decomposition, symmetrical 3-phase short circuit and 1-phase short circuit. Further, the thesis dwells on the switchgear designing of low voltage switchgear. Finally was created in 3D visualization and treated bid for the material needed for the production of switchgear system, production of switchgear system and UPS.
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Energy supplying of street tunnel
Kloc, Martin ; Procházka, Aleš (referee) ; Orságová, Jaroslava (advisor)
This bachelor's thesis describes the electric power supply of a road tunnel and explains general rules and requirements which are necessary to ensure the power supply for tunnel construction. Another topic of this thesis is design of the technological equipment and the whole power supply system for 8 km long road tunnel.
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Dimensioning of Earthing System in HV Switchgear
Buršík, Roman ; Matuška, Marcel (referee) ; Orságová, Jaroslava (advisor)
My master's thesis is focused on grounding of HV switchgear. The aim of this work is to create a computer program intended for dimensioning of earthing networks. The earthing networks are the most convenient alternative in term of effective grounding and distribution of ponential. They are based on latiny a flat conductor network cables and connection of appliance parts to network. Introduction of the thesis is dedicated to explanation of grounding theory and to description of requirements essential for properly designed earthing system (dimensioning of earthing system). Following chapter brings description of computer program algorithm testing propriety of an assigned earthing network for a particular switchgear. The chapter also contains description of an user interface and explanation of all features, included in the program. Last part provides presentation of program utilization to particular numerical assignment.
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