Transient behavior of line-connections between GIS and transformer

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23220%2F17%3A43932540" target="_blank" >RIV/49777513:23220/17:43932540 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Transient behavior of line-connections between GIS and transformer

Popis výsledku v původním jazyce

It is obvious in EHV/ UHV- range, that a grid transformer is connected with a gas- insulated switchgear (GIS) by a certain kind of a transmission line. The distances from GIS to transformer can be hundreds meters dependent on the grid configuration. Especially for longer distances of such line-connection at switching operation in the GIS dangerous overvoltages may occur caused by travelling wave phenomena on the line and within the transformer. They are influenced not only by the speed of the pswitching operation (GIS) but they are also depending on the type of the line-connection and the wave properties of the connected transformer. The mentioned very fast transient phenomena were investigated for three line types: overhead line, cable and GIL, for various values of switching speed and different line length. Because of the very short rise time of switching operation it has been necessary to consider the wave propagation within the entire system. Therefore, the system consisting of the switching source (GIS), the line-connection and the transformer winding was modelled like a circuit with distributed parameters. Its analysis was carried-out numerically in time domain and an algorithm based on FDTD has been developed. It provides the time and space distribution of voltage and current waves along the line and the transformer windings. The impact of the line type and its length on the propagating voltage and current waves could be studied for various rise time of the switching operation. The analysis has shown, that in the case of the shorter rise time like for SF6- insulation type of GIS the connected transformer will be stressed significantly more than in the case of a lower switching speed. The obtained results enable deeper understanding of the behaviour at very fast transients not only along the line but also within the transformer winding. That can be used even for more secure design of electrical insulation and for protection systems.

Název v anglickém jazyce

Transient behavior of line-connections between GIS and transformer

Popis výsledku anglicky

It is obvious in EHV/ UHV- range, that a grid transformer is connected with a gas- insulated switchgear (GIS) by a certain kind of a transmission line. The distances from GIS to transformer can be hundreds meters dependent on the grid configuration. Especially for longer distances of such line-connection at switching operation in the GIS dangerous overvoltages may occur caused by travelling wave phenomena on the line and within the transformer. They are influenced not only by the speed of the pswitching operation (GIS) but they are also depending on the type of the line-connection and the wave properties of the connected transformer. The mentioned very fast transient phenomena were investigated for three line types: overhead line, cable and GIL, for various values of switching speed and different line length. Because of the very short rise time of switching operation it has been necessary to consider the wave propagation within the entire system. Therefore, the system consisting of the switching source (GIS), the line-connection and the transformer winding was modelled like a circuit with distributed parameters. Its analysis was carried-out numerically in time domain and an algorithm based on FDTD has been developed. It provides the time and space distribution of voltage and current waves along the line and the transformer windings. The impact of the line type and its length on the propagating voltage and current waves could be studied for various rise time of the switching operation. The analysis has shown, that in the case of the shorter rise time like for SF6- insulation type of GIS the connected transformer will be stressed significantly more than in the case of a lower switching speed. The obtained results enable deeper understanding of the behaviour at very fast transients not only along the line but also within the transformer winding. That can be used even for more secure design of electrical insulation and for protection systems.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20201 - Electrical and electronic engineering

Projekt

<a href="/cs/project/LO1607" target="_blank" >LO1607: RICE – Nové technologie a koncepce pro inteligentní průmyslové systémy</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Conference proceedings : 20th International Symposium on High Voltage Engineering (ISH 2017)

ISBN

978-987-45745-6-5

ISSN

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e-ISSN

neuvedeno

Počet stran výsledku

6

Strana od-do

1-6

Název nakladatele

National University of Tucumán

Místo vydání

Tucumán

Místo konání akce

Buenos Aires, Argentina

Datum konání akce

28. 8. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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