Transient temperature rise of conductor

This is the transient temperature rise of conductor above ambient temperature due to Joule losses.

After calculating separately the two partial transients and the conductor to cable surface attainment factor the total transient rise above ambient temperature is obtained

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Symbol
$\Delta \theta_{t}$
Unit
K
Formulae
$\Delta \theta_{c_{t}}$cables in air
$\Delta \theta_{c_{t}} + \Delta \theta_{e_{t}} \alpha_{t} + \Delta \theta_{p} \alpha_{t} v_{4}$buried cables
$\Delta \theta_{t_{\infty}}$
Used in
$\Delta \theta_{a_{t}}$