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Earthing effects of uncoated underground cables and transferred potentials

Wirkung von Erdkabeln mit nichtisolierten Mänteln und die erzeugte Potentialverteilung

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Contents

A model for the analysis of earthing effects of uncoated metallic sheathed underground cables is suggested. The model includes the proximity effects between the cable sheath and the earth electrodes of the transformer stations at the cable's terminals. Diagrams for assessing apparent sheath impedances to earth as well as transferred potentials and dangerous voltages at terminal stations are constructed appropriate for practical design.

Übersicht

Ein Modell für die Analyse der Erderwirkung von Kabeln mit nichtisolierten Mänteln wird vorgestellt. Das Modell berücksichtigt die gegenseitigen Beeinflussungen zwischen Kabeln und Erderanlagen an den Kabelenden. Diagramme für die Beurteilung der Erdausbreitungsimpedanzen von Kabeln, der erzeugten Potentialverteilung und Berührungs- und Schrittspannungen entlang der Kabeltrassen werden für die praktische Anwendung angegeben.

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Abbreviations

J :

fault current at the HV/MV station flowing into the earth

u k :

potential of earthing system elementk

i k :

current emanating into the soil from elementk

E t,E s :

touch- and step-voltages

Y :

longitudinal admittance of a cable sheath segment

Y n :

admittance to earth of the earthing structure bonded with the terminal station earth electrode

r kj :

mutual earth resistance for elementsk andj

r kk :

self resistance to earth of elementk

r kM :

mutual earth resistance of elementk and pointM

Z eq :

equivalent system impedance to earth as viewed at HV/MV station

Z a :

apparent cable's impedance to earth

l(l 1):

cable (characteristic) length

s :

sheath's segment length

H, d :

cable's depth of burial and diameter

D :

diameter of the equivalent plate modeling HV/MV station electrode

l r,d r :

rod length and diameter

ρ:

earth resistivity

References

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Authors and Affiliations

  1. Faculty of Electrical Engineering, P.O. Box. 816, 11001, Belgrade, Yugoslavia

    J. M. Nahman

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  1. J. M. Nahman
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Nahman, J.M. Earthing effects of uncoated underground cables and transferred potentials. Electrical Engineering 79, 55–60 (1996). https://doi.org/10.1007/BF01840708

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  • DOI: https://doi.org/10.1007/BF01840708

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