Emergency load current

This is the current which may be applied for time $\tau$ so that the conductor temperature at the end of the period of emergency loading reaches $\theta_{max}$.

The method only holds for values of $I_2\leq2.5I_R$

Symbol
$I_2$
Unit
A
Formulae
$I_R \sqrt{\frac{{h_1}^2 R_1}{R_{max}}+\frac{1-{h_1}^2 \frac{R_1}{R_{max}}}{\frac{\Delta \theta_t}{\Delta \theta_{R,\infty}}}}$