Transfer impedance of nonmagnetic conduits of various shapes

Author

van Deursen, A.P.J. ; van Horck, F.B.M. ; Van Helvoort, Mark J A M ; van der Laan, P.C.T.

Author_Institution

Dept. of Electr. Eng., Eindhoven Univ. of Technol., Netherlands

Volume

43

Issue

1

fYear

2001

fDate

2/1/2001 12:00:00 AM

Firstpage

18

Lastpage

28

Abstract

Metallic conduits provide mechanical support for cables, and may also protect the cables against interference caused by currents induced by external electromagnetic fields. The conduit transfer impedance Z_t then is a good measure for the provided protection. We studied Z_t by means of conformal transformations and of the method of moments in a quasistatic, two-dimensional (2-D) approach. Practical U-, H-, L-, and T-shaped conduits are discussed. Conformal transformations provide simple engineering expressions for the mutual inductance part of Z_t for cable positions inside the conduit. The method of moments formulation results in useful approximations for the crossover frequencies in Z_t between DC and high frequency. Measurements on U-shaped conduits confirm the calculations

Keywords

conductors (electric); earthing; electric conduits; electric impedance; electromagnetic fields; electromagnetic induction; electromagnetic interference; inductance; integral equations; method of moments; DC; H-shaped conduits; HF; L-shaped conduits; T-shaped conduits; U-shaped conduits; cable positions; conformal transformations; crossover frequencies approximation; electromagnetic fields; engineering expressions; high frequency; induced currents; integral equation; interference protection; mechanical cable supports; metallic conduits; method of moments; mutual inductance; nonmagnetic conduits; parallel-earthing conductor; quasistatic 2D approach; transfer impedance; Electromagnetic fields; Electromagnetic interference; Electromagnetic measurements; Frequency; Impedance measurement; Mechanical cables; Moment methods; Protection; Shape; Two dimensional displays;

fLanguage

English

Journal_Title

Electromagnetic Compatibility, IEEE Transactions on

Publisher

ieee

ISSN

0018-9375

Type

jour

DOI

10.1109/15.917927

Filename

917927