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Duct losses

In case of ducts made of (ferro)magnetic steel, the conductor current induces a current in the pipe which causes additional losses.

We calculate these losses using a separate loss-factor $\lambda_4$ for cables in a common magnetic steel pipe to distinguish them from the armour losses and from the losses in pipes of pipe-type cables.

Symbol
$W_{duct}$
Unit
W/m
Formulas
$\lambda_4 W_c$
Related
$\lambda_4$
Loss factor magnetic duct
$W_c$
Conductor losses (phase) [W/m]
Used in
$\Delta \theta_c$
Temperature rise conductor [K]
$\Delta \theta_{duct}$
Temperature rise duct (magnetic) [K]
$\theta_{de}$
Temperature duct outer surface [°C]