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The soil ionization influence on the lightning performance of transmission lines

Einfluss der erdionisation auf das Überschlagsverhalten an Freileitungen

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Contents

The paper presents a mathematical model for analyzing impulse characteristics of complex grounding grids in the cases with soil ionization. The model is based on the grounding grid equivalent circuit with lumped and current dependent parameters, described by a system of differential equations. The proposed model is convenient for practical application. It is incorporated into the present lightning overvoltage computation program. The soil ionization influence on the grounding grid impulse characteristics and lightning performance of 400 kV overhead line for various magnitudes of the soil ionization gradient, soil resistivities, grounding grid configurations as well as impulse current shapes and magnitudes is illustrated.

Übersicht

Diese Arbeit befaßt sich mit einem mathematischen Modell zur Analyse von Impulsformen auf ein komplexes Erdungssystem im Falle der Erdionisation. Dieses Modell beinhaltet verteilte Parameter der Leitungen und stromabhängige Parameter, welche mit einem Differentialgleichungssystem beschrieben werden. Dieses vorgestellte Modell ist gültig für praktische Anwendungen. Es wurde schon in ein bestehendes Simulationsprogramm zur Berechnung von Blitzüberspannungen eingebunden. Der Einfluß der Erdionisation auf Impulsformen am Erdungssystem und die Überspannungen auf 400 kV Freileitung für verschiedene Amplituden des Erdionisationsgradienten, Leitfähigkeiten der Erde, Anordnung des Erdungssystems, Forme und Amplitude des Strom wird vorgestellt.

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  1. Faculty of Electrical Engineering, University of Belgrade, Bulevar revolucije 73, YU-11120, Belgrade, Yugoslavia

    Z. Stojković

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  1. Z. Stojković
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Correspondence to Z. Stojković.

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Stojković, Z. The soil ionization influence on the lightning performance of transmission lines. Electrical Engineering 82, 49–58 (1999). https://doi.org/10.1007/s002020050076

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