In the present study, a simplified and efficient numerical simulation approach has been developed for thermal analysis for the high voltage (HV) cable tunnel with extended length. The thermal behavior analysis of different HV cable arrangements, thermal properties, as well as the amount of heat dissipating towards the water-cooled system and the surroundings was analyzed and discussed in detail. With a typical sand-filled HV cable and pipe work arrangement, the circuit water-cooling system would take up around 85% of the total heat dissipation. The remaining heat is catered by the tunnel ventilation system and the soil surrounding the tunnel. Note that an air-filled cable trough is less preferable.

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