As LV networks are inconstant and stochastic in geometry
over their extent, the distributed line elements are also not uniform
over length. Therefore, the characteristic impedance of LV
networks is inconstant over its elongation and, consequently,
impedance matching is not possible. Additionally, the line resonances
of single wires are coupled to adjacent wires within the
harness via crosstalk; thus, the line resonances of singlewires are
damped and occur irregularly over frequency. In contrast, HV
cables have constant per unit length lumped elements, as their
cross-section geometry is constant over elongation. Therefore,
they have constant characteristic impedances, depending on cable
diameter, geometry, and permittivity of the insulation material
applied. Termination becomes essential, because HV cables
act as transmission lines above frequencies, where ≥ λ(f)/10
and, therefore, need to be terminated with their characteristic
impedance (for typical harness lengthsf >∼10 MHz) [12].
Line resonances which occur, caused by HV cable’s termination
mismatch within the component level EMC test setup according
to CISPR 25, are able to falsify the measurement results of
conducted emissions [19].