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Steel pipe losses (phase)

In case of pipe-type cables, the conductor current induces a current in the (ferro)magnetic steel pipe which causes additional losses. According to IEC, the losses in magnetic steel pipes are part of the armour losses $W_{ar}$ for pipe-type cables.

We calculate these losses using a separate loss-factor $\lambda_3$ to distinguish them from the armour losses.

Symbol
$W_{sp}$
Unit
W/m
Formulas
$\lambda_3 W_c$
Related
$\lambda_3$
Loss factor steel pipe pipe-type cable
$W_c$
Conductor losses (phase) [W/m]
Used in
$\Delta \theta_c$
Temperature rise conductor [K]