Cableizer ®

Transverse relative permeability steel wires

The traverse relative permeability of steel wires varies with the particular sample of steel. Unless reference can be made to measurements on the steel wire to be used, some average value must should be assumed. No appreciable error is involved if, for wires of diameters from 4 mm to 6 mm and tensile breaking strengths around 400 N/mm$^2$, a value of $μ_t = 10$ is assumed when wires are in contact an $μ_t = 1$ where wires are separated.

Touching or separated wires can be selected in the cable editor and is valid for both layers in case of double layer armour. We also consider the armour to be touching, independent from the checkbox, when the wires cover 95 % of the circumference.

Symbol
$\mu_t$

Default
10

Formulas
$10$touching wires
$1$wires not touching
Used in
$H_3$
Inductance $H_3$ armour [H/m]