Title :
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
fDate :
2/1/2001 12:00:00 AM
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 Zt then is a good measure for the provided protection. We studied Zt 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 Zt for cable positions inside the conduit. The method of moments formulation results in useful approximations for the crossover frequencies in Zt 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;
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
