Cableizer ®

Separation of conductors in a system

In multi-core cables, the axial separation depends on the sreen and sheath construction.

In arrangements with single-core cables, the axial separation is the shortest distance between the center of two phases.

Symbol
$s_{c}$
Unit
mm
Formulas
$d_{x}+t_{i1}$multi-core cables, sector-shaped conductors
$D_{i}$multi-core cables, common screen/sheath
$D_{i}+2\left(t_{scb}+t_{sc}+t_{scs}\right)$multi-core cables, separate screen and common sheath
$D_{sh}$multi-core cables, separate screen/sheaths
$D_{shj}$multi-core cables, jacket around each core
$D_{sw}$multi-core cables, pipe-type cables with skid wires
Related
$a_{12}$
Distance phases 1—2 [mm]
$a_{23}$
Distance phases 2—3 [mm]
$a_{31}$
Distance phases 3—1 [mm]
$D_{i}$
Diameter over insulation incl. insulation screen [mm]
$D_{sh}$
Diameter over sheath [mm]
$D_{shj}$
Diameter over sheath jacket [mm]
$D_{sw}$
Diameter over skid wires [mm]
$d_{x}$
Equivalent diameter conductor [mm]
$t_{i1}$
Thickness of insulation between conductors [mm]
$t_{sc}$
Thickness screen [mm]
$t_{scb}$
Thickness screen bedding [mm]
$t_{scs}$
Thickness screen serving [mm]
Used in
$a_{m}$
Mean distance between the phases [mm]
$c_{c}$
Distance conductor axis—cable axis [mm]
$\Delta_{1}$
Substitution coefficient $\Delta_1$ for eddy-currents
$\Delta_{2}$
Substitution coefficient $\Delta_2$ for eddy-currents
$GMR_{cc}$
Geometric mean radius conductor bundle [mm]
$\lambda_{0}$
Substitution coefficient $\lambda_0$ for eddy-currents
$\lambda_{21}$
Loss factor armour, circulating currents
$\lambda_{22}$
Loss factor shield, eddy currents
$\lambda_{3}$
Loss factor steel pipe pipe-type cable
$\lambda_{4}$
Loss factor magnetic duct
$S_{m}$
Separation of conductors in a system [m]
$X_{ar}$
Self reactance armour [$\Omega$/m]
$X_{e}$
Self reactance screen/sheath [$\Omega$/m]
$X_{S1}$
Reactance section 1 [$\Omega$/m]
$X_{S2}$
Reactance section 2 [$\Omega$/m]
$X_{S3}$
Reactance section 3 [$\Omega$/m]
$y_{p}$
Proximity effect factor conductor