Estimates of lightning-induced voltage stresses within buried shielded conduits

Author

Tesche, F.M. ; Kälin, A.W. ; Brändli, B. ; Reusser, B. ; Ianoz, M. ; Tabara, D. ; Zweiacker, P.

Author_Institution

EMC Consultant, Dallas, TX, USA

Volume

40

Issue

4

fYear

1998

fDate

11/1/1998 12:00:00 AM

Firstpage

492

Lastpage

504

Abstract

This paper examines the responses of four different types of shielded conduits to a direct lightning strike. The conduits are buried in the ground and run between two shielded enclosures, one of which is struck by lightning. An induced current flows on the conduit and this induces a voltage on the inner wires within the shield. Using a simple resistive model, this voltage is estimated and the effectiveness of the shielding provided by the various conduits is determined. A key element in the calculations is the transfer impedance of the conduits and an experimental program for determining these quantities is described. From this study, requirements for lightning surge protection devices can be developed

Keywords

cable shielding; electric conduits; electric current; electromagnetic induction; lightning; lightning protection; magnetic shielding; surge protection; underground cables; buried shielded conduits; direct lightning strike; experimental program; induced current; inner wires; lightning surge protection devices; lightning-induced voltage stresses; resistive model; shielded enclosures; shielding effectiveness; transfer impedance; Buildings; Earth; Electronic equipment; Lightning; Power cables; Stress; Surge protection; Surges; Voltage; Wires;

fLanguage

English

Journal_Title

Electromagnetic Compatibility, IEEE Transactions on

Publisher

ieee

ISSN

0018-9375

Type

jour

DOI

10.1109/15.736209

Filename

736209