Transient temperature rise of conductor

This is the transient temperature rise of conductor above ambient temperature.

After calculating separately the two partial transients and the conductor to cable surface attainment factor the total transient rise above ambient temperature is obtained

for buried configurations by simple addition of the cable and modified environmental partial transients;
for cables in air by modification of the cable partial transient.

Symbol

$\Delta \theta_{c,t}$

Unit

Formulae

$\Delta \theta_{c,t,o}$	cables in air
$\Delta \theta_{c,t,o}+\Delta \theta_{d,t}+\alpha_t \Delta \theta_{e,t}+\alpha_t v_4 \Delta \theta_{p,t}$	buried cables

Related

$\alpha_t$

Conductor to surface attainment factor

$\Delta \theta_{c,t,\infty}$

Steady-state temperature rise of conductor [K]

$\Delta \theta_{c,t,o}$

Transient temperature rise of conductor by ohmic losses [K]

$\Delta \theta_{d,t}$

Transient temperature rise by dielectric losses [K]

$\Delta \theta_{e,t}$

Transient temperature rise of outer surface [K]

$\Delta \theta_{p,t}$