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Conductor temperature rise above ambient temperature

This is the conductor temperature rise above ambient temperature.

$\delta\theta_R(t)$: Conductor temperature rise above ambient at time t after application of current $I_{R}$, neglecting variation in conductor resistance.
$\delta\theta_R(i)$: Conductor temperature rise above ambient, when the magnitude for the step function current is the sustained rated current, and $i$ is expressed in hours.
$\delta\theta_R(\infty)$: Conductor temperature rise above ambient in the steady state, i.e. the standard maximum permissible temperature rise.

Symbol
$\delta \theta_R$
Unit
K
Related
$\delta \theta_{R,\infty}$
Max permissible conductor temperature rise in the steady-state [°C]
$\delta \theta_{R,t}$
Conductor temperature rise at time t [°C]
$M$
Cyclic rating factor [p.u.]