Detection and Prediction of Internal-Caused Fire in Tunnel Cable by an Equivalent Transient Thermal Circuit Model

Table 1

Parameters of layers of YJV22 6/10 kV cable.

Structure	Inner diameter (mm)	Outer diameter (mm)	Thermal conductivity	Volumetric heat capacity
Conductor		8.6	400	434.14
Insulation layer	8.6	17.6	0.32	303.12
Insulation shielding layer	17.6	19.2	400	434.14
Wrapping tape	44.4	45.4	0.2	196.00
Inner sheath	45.4	49.2	0.2	124.2
Cable armored layer	49.2	50.2	48	372.88
Outer sheath	50.2	55.6	0.2	124.2