Naslov
Direct Time Domain Analysis of a Grounding Electrode Based on the Antenna Theory

Autori
Dorić, Vicko ; Poljak, Dragan ; Roje, Vesna

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts / Rachidi, Farhad - Lausanne : École polytechnique fédérale de Lausanne (EPFL), 2008, 187-187

Skup
EUROEM 2008 European Electromagnetics

Mjesto i datum
Lausanne, Švicarska, 21.07.2008. - 25.07.2008

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Grounding electrodes; direct time domain analysis; thin wire antenna; GB-IBEM

Sažetak
The grounding electrodes play important role in protection of telecommunication systems and electrical power systems against overvoltages and fault currents. Thus, the analysis of the transient behavior of grounding electrodes is necessary for an efficient design of the protection system. In general, the transient response of any linear system could be obtained directly, by solving the time domain equations, or by frequency domain approach and inverse Fourier transform. Previously used models can be classified as circuit approach, transmission-line approach and antenna theory approach. Antenna theory approach is most accurate one, but also the most demanding and, until now, limited to the frequency domain analysis. In this work a novel time domain model of the grounding electrode based on the wire antenna theory is proposed. Grounding electrode is modelled as a thin wire antenna excited with the current source at the wire end. The formulation is based on the correspondig homogeneus time domain Pocklington integrodifferential equation for thin wire in infinite lossy medium. Rather demanding Green function containing convolution and the Bessel function is simplified assuming the low conductivity of the soil. Thus obtained equation is numerically handled via the time domain Galerkin-Bubnov scheme of the Indirect Boundary Element Method (GB-IBEM). Current distribution along the wire for each time step is obtained using the adequate marching on in time procedure. Validity of the proposed model is tested using antenna theory approach in frequency domain and inverse Fourier transform.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

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