# Temperature rise ratio $\delta\theta_{SPK}/\delta\theta_c$

Ratio of peak cyclic temperature rise of the cable surface to the permissible steady-state temperature rise of the conductor due to joule losses.

Symbol
$k_{r2}$
Unit
p.u.
Formulae
$\frac{\delta\theta_{SPK}}{\delta\theta_c} = 1-M^{2} (1-k) \left( \sum\limits_{i=0}^5 Y_i \left[\alpha(i+1)-\alpha(i)\right] + \mu\left( 1-\alpha(6) \right) \right)$
Related
$\delta \theta_{c}$
$\mu$
Used in
$\delta \theta_{SPK}$
$M_{1}$