Traverse relative permeability of steel wires

The traverse relative permeability of steel wires depends on the particular sample of steel. The used value is an average value for wires of diameter from 4 to 6 mm. It also depends whether the wires are touching or not. This 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

$\mu_t$

Formulae

$10$	touching wires
$1$	wires not touching

Used in

$H_3$

Component of inductance $H_3$ of armour [H/m]