Numerical Study of Heat Transfer in Trefoil Buried Cable with Fluidized Thermal Backfill and Laying Parameter Optimization

Table 1

Typical geometric and physical parameters of trefoil cables (cable quadrature = 1600 mm²).

Cable	Radius [mm]	Material	Thermal conductivity [W/(m·K)]	Electronic conductivity [S/m]
Cable core	24.8	copper	400	5.998 × 10^7
Insulation layer	55.3	XLPE	0.38	1.0 × 10^−15
Sheath layer	61.7	copper	400	5.998 × 10^7
Jacket layer	66.8	HDPE	0.38	1.0 × 10^−15