The conductor to cable surface temeperature rise attainment factor for the transient temperature rise between the conductor and outside surface of the cable.

The following formula is equal to the formula in the IEC 60853: $Δθ_{c_t}/(n_{c}W_{c}(T_A+T_B))$

Symbol
$\alpha_{\mathrm{t}}$
Unit
-
Formulae
$\frac{1}{T_{\mathrm{A}} + T_{\mathrm{B}}} \left(T_{\mathrm{a0}} \left(1 - e^{- a_{\mathrm{0}} \tau}\right) + T_{\mathrm{b0}} \left(1 - e^{- b_{\mathrm{0}} \tau}\right)\right)$
$T_{\mathrm{a0}}$
$T_{\mathrm{b0}}$
Used in
$\Delta \theta_{\mathrm{t}}$