|
|
Testing of Synchro-check Function of Feeder Protection Terminal
Cekl, Jakub ; Wasserbauer, Vojtěch (referee) ; Orságová, Jaroslava (advisor)
This thesis is oriented on testing of automatic synchronizing with the help of the machine terminal REM 545 by ABB and its synchro-check function by CMC 256+ tester by OMICRON, where network and alternator parameters are simulated. Basic principles of phasing and phasing conditions are briefly mentioned. Creation of configuration, tester preparing and test execution are described in following chapters. Test of real use is suggested at the end.
|
|
|
Compensation of reactive power to avoid its overflow into the MV system
Jurák, Viktor ; Ptáček, Michal (referee) ; Orságová, Jaroslava (advisor)
This master thesis is focused on analysis of reactive power flow in LV and MV networks. In the first part there is a definition of reactive power and description of individual parts of electrical networks that contribute with their reactive power to distribution network. The second part is dedicated to calculation of power flow in simulation software PSS® Sincal where on numerical models of network different types of network configuration are tested and consequently its influence on reactive power flow is evaluated. A more detailed analysis is dedicated to reactive power compensation in networks with distributed generation equipped with Volt-Var regulation and its possible negative mutual influence. This thesis also includes general recommendation on the basis of network simulation analysis concerning installation of compensating systems in distribution transformer station.
|
|
|
Protection of Overhead Lines Against Climatic Factors
Petr, Pavel ; Novotný, Jan (referee) ; Orságová, Jaroslava (advisor)
Overhead power lines are devices on the transmission of electrical energy, which must resist the mechanical and electrical strain. The criterion for correct suggestion of overhead lines is the control of the limit level loads. This thesis aims to discuss the weather influences acting on the wires overhead. The first part focuses on the distribution of climatic factors influencing the wires overhead wires and calculations of strain for different weather factors. The second part is then focused on the protection of overhead against the negative effects caused by wind and icing. This thesis therefore deals primarily with the wals of de-icing of conductor overheads and with the calculations needed for the heating of wires. There are presented calculation procedures for determining basking current on de-icing from the conductors.
|
|
|
Earth Faults Protections
Ostruška, Jan ; Topolánek, David (referee) ; Orságová, Jaroslava (advisor)
The thesis deals with wattmetric and conductance principle of faulted feeder detection in medium voltage compensated distribution networks. These principles are analysed and tested with particular emphasis on high impedance earth faults. The first part of testing utilizes data about state of the system with earth fault, which was determined by designed static model of earth fault. The testing in the second part utilizes real records of high impedance earth faults. In both parts the wattmetric and conductance protections was presented on protective relays ABB REF 615, ABB REM 543 and Protection&Consulting RYo by means of unit OMICRON CMC 256plus. As a major result of performed tests are records of detection of particular earth faults. Based on these records it could be concluded, that functionality of protections is substantially dependent on magnitude of zero sequence voltage. Furthermore the wattmetric protections are dependent on fault resistance as well.
|
|
|
Container LV/MV switchgears
Mendroš, Miroslav ; Loutocký, Evžen (referee) ; Orságová, Jaroslava (advisor)
In this thesis author discuss main facilities of switchgear-rooms placed into metallic containers based on ISO containers primary used for transport. In the beginning of this thesis, author writes about the basic requirements needed for realization of switchgear-rooms placed into metallic containers. Paragraph includes parameters of ISO containers, benefits and necessary modifications of containers for substations. Author continues with environment impact of this solution. In the next paragraph author describes most important electrical devices, machines and components such as HV and LV ABB switchgears, transformers and other used devices and components. Next part deals with dimensions of holes for cables, air-conditioning and ventilators and calculations for light and air-conditioning proposal for concrete substation solved for SNOS in Salavat. Final part includes DIAlux export to show light intensity in different nodes of grid in switchgear room. Enclosure contains pictures and photographs for a better understanding of this unique solution and tables for proposal of heat profits from walls.
|
|
|
Proposal for the Procedure of Supply Restoring for Power Plant Teplárny Brno Auxiliary System after Extensive System Fault in PS
Jára, Jaroslav ; Vaculík, Petr (referee) ; Orságová, Jaroslava (advisor)
This work deals with the issue of supply restoring for heating plant Teplárny Brno, a. s. Špitálka division, after a system-wide failure of the “blackout”. The thesis solves the “black start” of the Špitálka Teplárny Brno operation by delivering a voltage from the hydroelectric power Vír I, proposes a methodology for commissioning of individual devices, up to phasing the generators with subsequent possibility of creating an “island mode” in the area of Brno city, which the work already does not deal with. The work also deals with the preparation of the operational test, while starts of the selected devices are tested. The schedule of commissioning of each device is supported by calculations of the parameters for the entire system with regard to voltage drops while connecting the high load. The result of this work is the proposal of methodological process of supply restoring for power plant Teplárny Brno – Špitálka division, by submission a voltage from the hydroelectric power Vír I, which can be used both in any system-wide failure of the “blackout”, or during the operational test.
|
|
|
Project of Backup Power Source for the Heating Plant Červený mlýn
Nagy, Pavel ; Vrána, Michal (referee) ; Jára, Jaroslav (referee) ; Orságová, Jaroslava (advisor)
This thesis describes a design of backup power for heating plant Červený mlýn, Teplárny Brno, a.s. The backup power would be used in case of loss of power from the electricity grid, especially in the case of so-called "blackout". Backup power would supply only necessary systems of this heating plant, such as spinning turbines before stopping, control room power supply and lighting. Particularly designs of accumulator, flywheel and diesel generator are discussed. The main aim is to choose the optimum solution.
|
|
|
Short Circuit Calculation and Generator Protections Settings for Hydro Plant Lipno I
Guliš, Tomáš ; Topolánek, David (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.
|
|
|
Thermal characteristics of power conductors
Měrka, Ivan ; Novotný, Jan (referee) ; Orságová, Jaroslava (advisor)
This bachelor’s thesis aims to theoreticaly analyze thermal phenomena in power conductors and construct a simulation of thermal characteristics of conductor under load. First, power conductors and their classification is discussed. Following are elementary information in thermomechanics and ways of heat transfer. Next chapter talks about different ways of cable laying with respect to their steady temperatures and the design of conductor’s cross section. Further chapter focus on unsteady state of the heating conductor, analysis of Van Wormer’s method for acquisition of thermal characteristics and in this method the model for parameterized conductors is based. In conclusion the simulated results are verified and compared to the results of practical laboratory measurement.
|
|
|
The parameters of MV line
Dohnal, Martin ; Orságová, Jaroslava (referee) ; Toman, Petr (advisor)
This work deals with calculation of parameters of power lines and measuring of them. First part deals with calculation of parameters of power lines. Second part deals with measurement of parameters of power lines. Third part deals with measurement of parameters of real MV line using measuring system OMICRON CPC 100 + CP CU1. Measured values are compared with calculated values.
|
guest ::
RSS feed.