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Project of Overhead Line
Chrástek, Radim ; Těžký, Jiří (referee) ; Orságová, Jaroslava (advisor)
Overhead line has to suit a series of requests, so that all its parts safely resist mechanical and electrical tension. This bachelor’s thesis deals with mechanical tension. At first, necessary overhead line’s relationships under different climatic conditions are deduced. Consequently, practical calculations are introduced. Calculations are done with Matlab program.
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Hybrid AC/DC,AC/AC substation operation analysis
Lakomý, Marek ; Orságová, Jaroslava (referee) ; Dohnal, Petr (advisor)
The work analyzes the operation of hybrid substations. The first chapter provides an analysis of domestic traction systems and describes in detail specific station. The next chapter follows the first in a way in which obtained parameters are converted to parameters suitable for the simulation program and presents its results. The third chapter discusses the serial communication used in one switchgear and about voltage regulator that controls one high voltage field. The last chapter verifies the simulation results obtained from the second chapter with real measurement and direct comparison is also included.
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Analysis of Mechanical Stress during Short Circuit in an Air-Insulated MV Switchgear
Bártů, Jan ; Bajánek, Tomáš (referee) ; Orságová, Jaroslava (advisor)
This Master thesis is based on problems of force effects of the magnetic field of short-circuit current. Firstly, I analysed the force action of the three phase busbars during the three-pole short circuit. The analysis was performed in the Ansys Maxwell program and I verified the correctness of the analysis by numerical calculation. The second practical part was executed for ABB company. The main task was to analyse the force effects of the short-circuit current in the HV switchgear with focusing on the arms and contact system of the circuit breaker. The simulations of the following configurations were performed in more details: three configurations of the simplified VD4 circuit breaker, two types of VD4 circuit-breaker contact systems and a linear circuit breaker configuration model. The objective was to calculate the forces acting on the current path of the arms and contact system of the VD4 circuit breaker during the three-phase short-circuit and to simulate the effects of forces on these current parts. For modelling of individual assemblies, calculations and simulations I used: SolidWorks 2014, Ansys Maxwell 16.0 and Ansys Workbench 14.5 programs. With SolidWorks 2014 3D CAD software were modelled simplified assemblies of circuit breakers and contact systems. These systems were imported into the Ansys Maxwell software, where the force effects of the magnetic field of the short-circuit current were calculated. In Ansys Workbench programme was simulated the effect of forces on the current circuit breakers. Moreover, the final deformations of the materials (with respect to the mechanical properties of the structure) were plotted. The analysis of force effects of the magnetic field was performed for the specified static short - circuit current value.
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Testing of Distance Protection
Řehoř, Jiří ; Topolánek, David (referee) ; Orságová, Jaroslava (advisor)
The testing of distance protection in bachelor´s task is made a distinction between protection, requirements and relegation. This testing is also consisted in principle of function, describing terms of distance protection and comparing with time-current characteristics. The next step after short estimation was describing digital distance protection SIPROTEC 7SA511. The advantages are included in this estimation. The next part contains some configurations and connections with a test equipment in order to take control of measuring through the computer. The extended configurations are also comprised of two programms – DIGSY and TZO3. We had to make a suggestion of suitable methodics for measuring a time-current characteristic. We carried out three measurements where the test equipment was set to role of type TREND. A magnitude is generated at the output that is changed linearly in time with required rate (speed). We changed a current IX1 for our measurements that was undertaken with a rate of current rise. This process was given by a test equipment when the set values were constant. In the second measurement we modified a size of shift phase in the test equipment. In the third measurement we tried to set up different sizes of particular impedance characteristics (zone) inside of the distance protection where was set a neutral breaking time for the measured zone. On the contrary, the previous measurements had an absolute time.We have introduced evaluated results of measuring and observations in the end of this bachelor’s thesis.
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Dimensioning of Supporting Constructions for MV Overhead Lines
Křepela, Pavel ; Novotný, Jan (referee) ; Orságová, Jaroslava (advisor)
The reason of supporting constructions is to transfer all power activity and fulfill all requirements on safe operation of electrical grid. This bachelor’s thesis deals with designing of supporting constructions of the overhead line MV. The main task is to acquire knowledges about single parts of supporting constructions and to describe steps of power effects calculation according to current legislation. The outcome is a simple software application for supporting constructions design from power effect viewpoint.
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Short Circuit Calculation and Generator Protections Settings for Hydro Plant Lipno I
Guliš, Tomáš ; Jaroš, Michal (referee) ; Orságová, Jaroslava (advisor)
This Master 's thesis deals with the topic of protection of generators in case of faults, short circuits and their calculation according to the valid standard ČSN EN 60909-0 ed.2. The practical part includes the calculation of the minimum and maximum short-circuit currents of the Lipno I hydroelectric power plant at various locations using the NetCalc calculation program and for comparison of program funcionality provides the manual calculation. Next chapter deals with the calculation of settings of each protection function of the SIEMENS Siprotec 7UM622 protection relay, which is used to protect main generators of this hydropower plant.
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Testing of transformer protection
Kulač, Ivan ; Novotný, Jan (referee) ; Orságová, Jaroslava (advisor)
The main theme of my Bachelor thesis was protection of the transformer, measured case was orient to differential protection of the transformer, functions, stabilization and release characteristic. The proposed method of testing module SPCD3D53 differential protection SPAD 346C which was made by ABB. Setting of release characteristics on the protection were made for real power transformers. Testing device OMICRON CMC 256 plus was used to measurement, which was same as protection connected to personal computer. All the PC’s settings operations were realized by recommended software. The measurements were made for three cases, when differential current was in one, two or three phases. Results of measurement are mentioned in tables and graph.
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Differential Protection for Power Transformer
Bukvišová, Zuzana ; Wasserbauer, Vojtěch (referee) ; Orságová, Jaroslava (advisor)
This thesis explores power transformer protection and focuses on differential protection. It attempts to explain its principles and operating characteristic settings. The measurement was executed on devices SPAD 346 C and REF542plus, which can be used for differential protection. At the end, there is a comparison of results of operating characteristic measurement on both devices. Their function was tested at different cases, specifically when the differential current occurs in all phases or just one. The thesis includes a comparison of reaction times under fast increase of current. OMICRON CMC 256 plus was used as the test device. The data obtained by the measurement are processed in tables and charts.
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Analysis of the electrical power measurement system in the local distribution network Pod Palackého vrchem
Hájková, Barbora ; Orságová, Jaroslava (referee) ; Jurák, Viktor (advisor)
The diploma thesis introduces a detailed analysis of the local distribution system (LDS) Pod Palackého vrchem (PPV) in the Brno, parameters of power transformers and cable routes between them. The elements of the electrical network that are influencing the balance of reactive power are described along with its sources and appliances. In the next part is defined the present concept of long-term measurement in the LDS by using current and voltage sensors. This part deals with calculations of power losses in the power transformers and the cable lines together with uncertainties concerning power measurement in the field of energetics. The essential part of the thesis focuses on the analysis of the temporary measurement implementation in the LDS, data processing along with the comparison of measured values from temporary measurement with values from permanent measurement. In conclusion, the error of the system is determined.
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Projet of reconstruction of the 22 kV incoming substation and the cable network in the faculty hospital campus
Komárek, Filip ; Procházka, Aleš (referee) ; Orságová, Jaroslava (advisor)
This master's thesis deals with the area hospital distribution networkand one of the hospital's entry substation. The first part of this master's thesis deals with the project of the new cable network, her gradual revival without any power outages at the collection points. Futher, in this thesis is project of temporary transformer station for supplying power during the reconstruction of the HV switchboard. Subsequently, in this thesis is project of the new HV switchboard in one of the entry substation. new HV switchgear and a new HV substation were projected. Futher, in this thesis is proposed compensation of the whole area, including the HV network.
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