Total thermal capacitance, transient

Total thermal capacitance of cable for transient calculations.

Symbol

$Q_{tot}$

Unit

J/m.K

Formulae

$Q_{a_{1}} + Q_{a_{2}} + Q_{ab_{1}} + Q_{ab_{2}} + Q_{ct} + Q_{it} + Q_{j} + Q_{sc} + Q_{scb} + Q_{scs} + Q_{sh}$	Single-core cables
$Q_{a_{1}} + Q_{a_{2}} + Q_{ab_{1}} + Q_{ab_{2}} + Q_{ct} + Q_{f} + Q_{it} + Q_{j} + Q_{sc} + Q_{scb} + Q_{scs} + Q_{sh}$	Multi-core cables type CC
$Q_{a_{1}} + Q_{a_{2}} + Q_{ab_{1}} + Q_{ab_{2}} + Q_{ct} + Q_{f} + Q_{it} + Q_{j} + Q_{sh} + n_{c} \left(Q_{sc} + Q_{scb} + Q_{scs}\right)$	Multi-core cables type SC
$Q_{a_{1}} + Q_{a_{2}} + Q_{ab_{1}} + Q_{ab_{2}} + Q_{ct} + Q_{f} + Q_{it} + Q_{j} + n_{c} \left(Q_{sc} + Q_{scb} + Q_{scs} + Q_{sh}\right)$	Multi-core cables type SS
$Q_{a_{1}} + Q_{a_{2}} + Q_{ab_{1}} + Q_{ab_{2}} + Q_{ct} + Q_{f} + Q_{it} + Q_{j} + n_{c} \left(Q_{sc} + Q_{scb} + Q_{scs} + Q_{sh} + Q_{shj}\right)$	Multi-core cables type SS with jacket over each sheath

Related

$n_{c}$

Number of conductors in object

$Q_{a_{1}}$

Thermal capacitance of 1st armour [J/m.K]

$Q_{a_{2}}$

Thermal capacitance of 2nd armour [J/m.K]

$Q_{ab_{1}}$

Thermal capacitance of 1st armour bedding [J/m.K]

$Q_{ab_{2}}$

Thermal capacitance of 2nd armour bedding [J/m.K]

$Q_{ct}$

Thermal capacitance of conductor (IEC 60853) [J/m.K]

$Q_{f}$

Thermal capacitance of filler [J/m.K]

$Q_{it}$

Thermal capacitance of insulation (IEC 60853) [J/m.K]

$Q_{j}$

Thermal capacitance of jacket [J/m.K]

$Q_{sc}$

Thermal capacitance of screen [J/m.K]

$Q_{scb}$

Thermal capacitance of screen bedding [J/m.K]

$Q_{scs}$

Thermal capacitance of screen serving [J/m.K]

$Q_{sh}$

Thermal capacitance of sheath [J/m.K]

$Q_{shj}$

Thermal capacitance of sheath jacket [J/m.K]

Used in

$TQ$

Cable thermal time constant [s]