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Thermal resistance backfill correction Neher

Thermal resistivity correction for native soil outside of trench for ac losses Please refer to CIGRE TB 880 chapter 7.11 (case study 3).

Symbol
$T_{4c}$
Unit
K.m/W
Formulas
$\frac{\mu \left(\rho_4-\rho_b\right)}{2\pi} G_b$
Related
$G_b$
Geometric factor backfill
$\mu$
Loss factor daily load variation [p.u.]
$\pi$
Archimedes' constant $\pi$
$\rho_4$
Thermal resistivity soil [K.m/W]
$\rho_b$
Thermal resistivity backfill [K.m/W]
$T_{4\mu}$
Thermal resistance ambient [K.m/W]