Effects of depth burial on current carrying capacity of XLPE 86/150 (170) kV underground cable

Indonesia Jabodetabek region tends to have high-density of population. This phenomenon contributes to the lack of land availability for 150 kV over-head line (OHL) transmission and to the development of new OHL circuit due to limitation issues by the local government regulation. To overcome this problem, the underground cables (UGC) transmission could be a solution. However, because there are existing installations laid on the ground, the newly developed UGC should be adjusted on the safe burial depth to avoid collision with the existing installations. This paper discusses on relation of current carrying capacity of single core 150 kV high-voltage UGC transmission at different common cable cross-section sizes applied in Jabodetabek region on its laying varied at 1 to 10 meter-depth referring to the ampacity value at the land surface laying (0 meter-depth) using statistical and econometric analysis. The results may represent as a general characteristics of UGC in its region.