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Correction depth of corrugation

Correction to consider larger diameter over corrugated sheath as by applying the depth of corrugation $H_{sh}$.
For example, to calculate CIGRE TB 880 Case study 5 a value of 0.25 mm needs to be set.

Symbol
$\Delta H$
Unit
mm
Used in
$A_{shj}$
Cross-sectional area sheath jacket [mm$^2$]
$D_{sh}$
Diameter over sheath [mm]
$d_{sh}$
Mean diameter sheath [mm]
$r_{z2,sh}$
Radius sheath (inner) [m]
$r_{z3,sh}$
Radius sheath (outer) [m]
$t_1$
Thickness conductor—sheath [mm]
$t_{1,t}$
Thickness conductor—sheath, transient [mm]
$T_2$
Thermal resistance armour bedding [K.m/W]
$t_2$
Thickness sheath—armour [mm]
$T_{ab}$
Thermal resistance armour bedding [K.m/W]
$T_{ab,1}$
Thermal resistance armour bedding 1 [K.m/W]
$T_{dsh}$
Thermal resistance corrugation filling [K.m/W]
$T_{shj}$
Thermal resistance sheath jacket [K.m/W]