Effects of lightning strikes on 20 kV earthcables

Author

Muhr, Michael ; PACK, Stephan ; HAIDVOGL, Herbert ; KREYCA, Franz

Author_Institution

Inst. fur Hochspannungstechnik, Tech. Univ. Graz, Austria

Volume

3

fYear

1997

fDate

1997

Abstract

Recently appeared defects on high voltage cables made an urgent evaluation of the impact of lightning strikes necessary. Sometimes overvoltages between the copper wire screen of the cable and earth causes damage to the oversheath. Field measurements with a classification of the voltage impulses at the copper wire screen have been made to evaluate the number of events. Additionally, a numerical model was developed to study the effects of atmospheric discharges on underground power cables with emphasis to the influence on the oversheath. This numerical method was also applied to estimate the effectiveness of different protection arrangements. This contribution presents evaluation methods for overvoltages of power cables and a model used firstly for calculating the stress caused by differential voltages and secondly to determinate the influence of protection measures

Keywords

underground cables; 20 kV; atmospheric discharges; grounding; high voltage power cables; lightning strikes; numerical model; oversheath damage; overvoltages; protection arrangements; underground power cables;

fLanguage

English

Publisher

iet

Conference_Titel

Electricity Distribution. Part 1: Contributions. CIRED. 14th International Conference and Exhibition on (IEE Conf. Publ. No. 438)

Conference_Location

Birmingham

ISSN

0537-9989

Print_ISBN

0-85296-674-1

Type

conf

DOI

10.1049/cp:19970534

Filename

667975