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PRIČAKOVANE VREDNOSTI PREHODNIH PRENAPETOSTI V SEKUNDARNIH TOKOKROGIH ELEKTROENERGETSKIH POSTROJEV PRI STIKALNIH PREKLOPIH Z LOČILNIKI
ŽIVIC, TOMAŽ (Author), Papič, Igor (Mentor) More about this mentor... This link opens in a new window

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Abstract
Obravnavan je en od parametrov elektromagnetnega okolja v elektroenergetskem postroju, t.j. prehodne prenapetosti, ki se pojavijo v sekundarnih tokokrogih pri stikalnih preklopih z ločilniki. Opredeljeni so načini prenosa prehodnih prenapetosti v sekundarne tokokroge in nastanek prehodnih prenapetosti. Prikazani so teoretični načini za zmanjševanje prenosa motenj s pasivnimi ukrepi in uporaba pasivnih ukrepov v postroju. Z računskim modelom je prikazan vpliv materiala osnovne ozemljitvene mreže in vrste kabla sekundarnega tokokroga na prehodno prenapetost. Rezultat računskega modela kaže, da je raven prenapetosti v kablu z opletom nižja od tiste v kablu brez opleta. V retrospektivni statistični analizi so na merilnih rezultatih iz različnih postrojev raziskani vplivi pasivnih ukrepov. Pričakovano najbolj izstopa nizka raven prenapetosti v kablih sekundarnih tokokrogov z opletom. Drugi pasivni ukrepi so izraženi manj izrazito. Rezultati analize kažejo na več neznanih parametrov postroja. Iz spremljajočih podatkov merilnih rezultatov ni bilo možno ugotoviti neznanih vplivnih parametrov. Vendar lahko sklepamo, da so dodatno potrebni parametri še vsaj kakovost izvedbe pasivnih ukrepov in podrobnejši podatki instrumentnih transformatorjev. Zasnovan je kriterij za ocenjevanje zagotovitve elektromagnetne združljivosti v elektroenergetskih postrojih. Kriterij temelji na statistični analizi izmerjenih prehodnih prenapetosti in upoštevanju tipske preskusne vrednosti za odpornost sekundarne naprave.

Language:Slovenian
Keywords:elektroenergetski postroj, elektromagnetna združljivost, elektromagnetne motnje, sekundarni sistem, pasivni ukrepi, zmanjševanje motenj, statistika
Work type:Master's thesis (m2)
Organization:FE - Faculty of Electrical Engineering
Year:2016
Views:460
Downloads:190
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Secondary language

Language:English
Title:EXPECTED VALUES OF TRANSIENT OVERVOLTAGES ON SECONDARY CIRCUITS IN ELECTRIC POWER SUBSTATIONS AT SWITCHING MANOEUVRES WITH DISCONNECTORS
Abstract:
Considered is one of the parameters of the electromagnetic environment in the electric power substation, i.e. transient over-voltage that occur in the secondary circuits at switching manoeuvres with disconnectors. Described are transmission modes of transient over-voltage to secondary circuits and the formation of transient over-voltage. The theoretical background of passive means and the use of passive means in substation for reducing interference transmission are shown. According to the computing model the impact of ground network material and cable type of secondary circuit on transients are shown. The result of numerical modelling shows that the level of over-voltage in the cable with the shield is lower than that of the cable without shield. In a retrospective statistical analysis of the measurement results from different substations the effects of passive means are studied. As expected it stands out the lowest over-voltages are on the secondary circuit cables with shield. Impact of other passive means on over-voltages is less pronounced. The results of the analysis indicate several unknown parameters. From the accompanying data of measurement results, it was not possible to determine the unknown influencing parameters. However, it can be concluded that the additional parameters required are at least the quality of the implementation of passive means and more detailed information about instrument transformers. The criterion for evaluation of electromagnetic compatibility assurance in electric power plants is designed. The criterion is based on a statistical analysis of the measured transient over-voltages and immunity type test value of secondary equipment.

Keywords:electric power substation, electromagnetic compatibility, electromagnetic disturbance, secondary system, passive means, interference reducing, statistics

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