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Optimization of the 110 kV distribution system in the Přeštice nodal region
Nagy, Pavel ; Křesálek, Petr (referee) ; Topolánek, David (advisor)
This work describes an actual condition of a specific part of a distribution power grid. It is a research of problems based on the computer model in case some power line is in failure or shut down. Simulations are calculated for both currently used load and load expected in future usage. There are partial solutions depicted for each issue found during the simulation. Some of those are used for a final design of a distribution power grid. In the last section, there is a comparison of different types of power lines and their possible usage in the design.
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Testing of Directional Earth Fault Protections Using The Experimentally Obtained Fault Records
Holub, Martin ; Topolánek, David (referee) ; Orságová, Jaroslava (advisor)
Master thesis Testing of Directional Earth Fault Protections Using the Experimentally Obtained Fault Records deals with the protective functions of earth fault protections during earth faults in compensated medium voltage distribution network and their testing options. At the beginning of the thesis we charakterize operation of medium voltage distribution system in general. We begin with definition and characteristics of earth fault and its compartmentalization by the type of the fault, size of the transition resistance and duration. We also mention grounding methods of node winding transformer on medium voltage distribution network and we describe the most common of them in detail, i.e. network grouded through the arc suppression coil and its operation with automatic switching auxiliary resistor. In this part of the thesis we discuss the localization of the earth fault using passive static methods in compensated systems, which include wattmetric, admittance and conductance method. In next section we deal with the fault records stored in COMTRADE file format, its structure and all elements of its configuration and data file. We create and describe an example of converting ADF file format, recorded by Yokogawa oscilloscope fault recorder, into COMTRADE file format using Microsoft Excel program and M-File created in the MATLAB program. In the practical part we introduce workspace devices and software, which includes secondary testing equipment OMICRON CMC 256plus and its software OMICRON Test Universe with Advance Transplay test module, we further describe multifunctional earth fault protection RYo from PROTECTION & CONSULTING, s. r. o. and machine terminal REM 543 from ABB and their protective functions. The last part describes the actual testing of parallel connected earth fault protection with COMTRADE fault records by Advance Transplay test module in the OMICRON Test Universe. In the conclusion we describe evaluation of the suitability of each protective functions of earth fault protection in a variety of sizes the transition resistance at the earth fault location.
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Field test of feeder protection ABB REF615 using an experimental model of 22kV distribution system
Váhala, Václav ; Orságová, Jaroslava (referee) ; Topolánek, David (advisor)
The main purpose of the bachelor thesis is to describe, preset and verify function of digital protection ABB REF615. The thesis is focused on detailed description from the protection function and hardware configurations point of view. The thesis also informs about parameters of experimental model of medium voltage distribution network. This model was used for operation testing of selected protection functions. First of tested function was admittance earth fault protection respectively conductance protection. This conductance principle is based on admittance protection function where only real part of zero sequence admittance is evaluated. Intermittent earth fault, phase directional over-current protection and circuit breaker failure protection were tested next. Evaluation of all test results is subject of the final part of the thesis.
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High Speed Transients Modelling
Bukvišová, Zuzana ; Topolánek, David (referee) ; Orságová, Jaroslava (advisor)
This thesis deals with the high speed transient modelling in the electrical networks. The introduction of this work discusses mathematical models of the individual devices used in the system and focuses on the line representation. It also contains a more detailed description of Bergeron and frequency dependent line model. The objective of this thesis is to design a network model using ATP-EMTP simulation program. In this model, the switching overvoltage caused by shunt reactor switching and lightning overvoltage are simulated. The thesis thoroughly describes the settings of the components used in the model of analysed network and in conclusion evaluates obtained simulation results in a relation to the insulation coordination.
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Design of The Data Communication Between Digital Protection Relays and Monitoring System of Dukovany Nuclear Power Plant
Šula, Vladimír ; Topolánek, David (referee) ; Toman, Petr (advisor)
This thesis describes the provision of the data communication of the new protection relays via 6 kV switch gears to the electro monitoring system at the Dukovany Nuclear Power Station. These protection relays will replace the current analog protection. The replacement process will start in 2015 and will finish in 2018. Given the overall complexity of the project, this thesis deals only with the following 6 kV switch gears 9BB and 9BD. The thesis is divided into a theoretical and a practical part. The theoretical part concerns the actual consumption and output of the Dukovany Nuclear Power Station. The following chapters describe the electro monitoring system and GRAF and LOGA software programs that are closely connected with it and that were used in the practical part. The last chapter of the theoretical part deals with the actual replacement of the protection relays of the 6 kV switch gears. Also, it describes a new optical network, which will be set up at the Dukovany Nuclear Power Station as a part of the process of replacement. The segment of the practical part concerns laboratory verification of the data communication of the new protection relays. Next, it describes actions that had to be taken in order to ensure and verify correct functionality of the data communication. This part is followed up by a closely related practical activity, which describes examination and verification of the protection functions of each of the 9BB and 9BD switch gears protection relays.
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Short-circuit Calculation of Local Distribution Network
Byrtus, Jiří ; Paar, Martin (referee) ; Topolánek, David (advisor)
This thesis deals with transient phenomena in the electricity grid - especially with short-circuits. First part describes short-circuit types, reasons for their commencement and also consequences of their functioning. The thesis further shows waveforms of short-circuit currents and its components. A method of calculating short-circuits currents, using the constituent systems and the basic equations for calculating short-circuit impedances are also mentioned here. Relations and methods are based on valid standards of IEC 60909 – 0. The second part indicates the calculation of two-phase and three-phase short-circuit currents for specific network of industrial building. This calculation aims to verify the dimensioning of substations for short-circuit currents after connecting a synchronous generator with given power to the main substation.
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Earth fault relay testing
Herůfek, Radek ; Topolánek, David (referee) ; Orságová, Jaroslava (advisor)
Bachelor thesis deals with an earth fault relay in compensated medium voltage distribution network. At the beginning of the thesis is described the method of operation compensated system and its advantages and disadvantages of using it. In addition, there is explained the definition of the ground fault, its types and there is outlined the method of solution asymmetrical single-phase fault. Thoroughly there is characterized distribution of voltages and currents, which is important for determination of affected and unaffected outlet. Among others, there is described the mode of action the arc suppression coil on caused fault current and also there are presented the auxiliary systems automation. In the next part the basic requirements for protections and its basic kinds are described. Finally the theoretical part describes principle of the earth fault relays and is presented means and methods used for indicate an affected outlet and earth fault localization. In the practical part, follows more detailed description of the protection REM 543 and testing equipment OMICRON CMC 256 +. In addition, there is explained connection process and setting selected functions and modules for testing earth fault relay. Assessment of generated and played transient disturbance records at the end.
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Testing of Merging Unit comprising voltage and current transducers in the set
Ziegler, Jiří ; Drápela, Jiří (referee) ; Topolánek, David (advisor)
The diploma thesis is focused on testing and design of a test system of merging unit which provides digital output according to IEC 61850-9-2. The parameters and distinguishing features of the test system are based on functional principles of merging unit and standards dealing with the testing of transducers. The proposed test system is based on modular PXI Express system from National Instruments. The desing is performed with respect to the possibility of generating test signals and measurements for voltage up to 38.4 kV and current up to 2000 A. The proposed test system meets the criteria for testing transducers of accuracy class up to 0.5. Assuming of calibration designed test system as a whole, this test setup has the potential to meet the technical requirements for testing transducers of accuracy class up to 0.1.
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Creation of a laboratory model of the earth system
Moliš, Martin ; Vyčítal, Václav (referee) ; Topolánek, David (advisor)
This work deals with designing of grounding system model. This model might be used for potential distribution, step and touch voltage measuring, depending on particular grounding system. Moreover measuring transferred potential into another grounding system and the influence of foreign grounding system’s presence on the overall earth resistance. The aim of this work is to create a simulation on the model of whole system’s behavior during a fault on the power line. This model also might be used for laboratory classes.
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Individual stand-by of incoming feeder of Energetika Trinecs´ 6 kV substation
Borski, Roman ; Hodula, Petr (referee) ; Topolánek, David (advisor)
The thesis titled Individual stand-by of incoming feeder of Energetika Třinec 6 kV substantion is theoreticaly and practically concived work that offers comprehensive information on automatic standby focused on the selected operation of Energetika Třinec. At present, the standby is in authention mode and thesis solves shutdown of transformer T5. The extract of automatic device indicates trouble-free operation and thesis focus on the power take-off for transformer T5. The theoretical part provides information about problems of own comsumption of power plants, automatic device of standby and protection of electrical equipment. Thesis also sloves the protection settings, which is supported by calculations of short-circuit currents. The practical part is formed from the suggestion of solution in accordance to current criteria and the evaluation of possible settings of protective automatic devices together with an assessment of implementation option of standby. The aim of the thesis is to perform analysis of standby and evaluate effects which causes shutdown of own comsumption part. The final part assesses current settings of protection based on calculated values. Existing protections are unsuitable and it is recomennded to deploy digital multi-stage protections as a replacement for present relay protections.
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