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Thermal resistivity armour bedding

Typical values for different materials are listed below.

Values are taken from IEC 60287-2-1 with following additions or deviations:

Note: The value is the average of the thermal resistivities of 1st and 2nd armour bedding layer weighted by their thicknesses.

Symbol
$\rho_{ab}$
Unit
K.m/W
Formulas
$\frac{\rho_{ab,1} t_{ab,1}+\rho_{ab,2} t_{ab,2}}{t_{ab}}$
Related
$M_{ab}$
Armour bedding material
$\rho_{ab,1}$
Thermal resistivity armour bedding 1 [K.m/W]
$\rho_{ab,2}$
Thermal resistivity armour bedding 2 [K.m/W]
$t_{ab}$
Thickness armour bedding [mm]
$t_{ab,1}$
Thickness armour bedding 1 [mm]
$t_{ab,2}$
Thickness armour bedding 2 [mm]
Used in
$a_{shj}$
Factor $a_{shj}$ for jacket around each core
$b_{shj}$
Factor $b_{shj}$ for jacket around each core
$c_{shj}$
Factor $c_{shj}$ for jacket around each core
$T_2$
Thermal resistance armour bedding [K.m/W]
$T_{ab}$
Thermal resistance armour bedding [K.m/W]
Choices
MaterialValueReference
PE3.5IEC 60287-2-1
PVC5.0 (U_n <= 30kV)
6.0 (U_n > 30kV)
IEC 60287-2-1
EPR3.5 (U_n <= 30kV)
5.0 (U_n > 30kV)
IEC 60287-2-1
POC3.5= PE
IIR5.0IEC 60287-2-1
NR7.0matweb.com
PP5.9Polypropylene - The Definitive User's Guide and Databook
SiR5.0shinetsusilicone-global.com
CR5.5IEC 60287-2-1
CSM9.1IEC 60287-2-1
CJ6.0IEC 60287-2-1
RSP6.0IEC 60287-2-1
BIT6.0IEC 60287-2-1
fPOC6.6Handbook of Polyolefins
fPP9.0Hearle and Morton 2008
fPE7.02 x PE
fPVC12.02 x PVC
tape6.0mix
Ot10.0fibrous polypropylene, IEC 60287-2-1