Naslov
An EMTP extension for computing earthing system transient step and touch voltages

Autori
Vujević, Slavko ; Sarajčev, Petar

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
CIGRE Symposium, Transient Phenomena in Large Electric Power Systems / - Pariz : CIGRÉ, 2007, (SII-1) 1

ISBN
978-2-85873-022-3

Skup
Transient Phenomena in Large Electric Power Systems, CIGRE Symposium

Mjesto i datum
Zagreb, Hrvatska, 18.04.2007. - 21.04.2007

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
average potential method; ATP-EMTP; earthing grid; Lightning analysis; step and touch voltages

Sažetak
This paper presents a novel technique for computing dangerous voltages due to lightning transients imposed on earthing system, which is based on the use of the well-known ATP EMTP software package. Earth surface transient potential distributions, as well as step and touch voltages computations, are performed through extending the widely used EMTP software package with a new post-processor (computer program), developed especially for that purpose. The earthing grid is approximated by the circular cross-section conductors. In numerical model, conductors are subdivided into segments (1D finite elements) and Clark's model with distributed constant parameters is then applied. Leakage conductance of conductor segments is modeled in EMTP as an additional lumped parameter. Analytical expressions for distributed and lumped segment parameters are derived using the average potential method. Due to the limitations of the EMTP, EM coupling between segments is neglected. The earth model is limited to the homogenous earth. Soil ionization effect is not accounted for, but could be incorporated, through some modifications of algorithms. Lightning surge model used is based on the Heidler's model of current source.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

POVEZANOST RADA