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

$\delta \theta_c$

Ohmic steady-state temperature rise [K]

$M$

Cyclic rating factor [p.u.]

$\mu$

Loss factor [p.u.]

Used in

$\delta \theta_{SPK}$

Peak cyclic temperature rise [K]

$M_1$

Corrected cyclic rating factor [K]