Analysis of Thermo-electric Coupled Simulation for 10 kV AC XLPE Cable under Different DC Topologies and Laying Modes

Abstract

This research aims to provide a theoretical reference for the 10 kV AC cable under the DC operation. To study the DC operation parameters of the AC cable in different laying methods and DC topologies, the temperature field, flow field, and electric field coupled simulation models are developed according to the parameters of the typical 10 kV three-core XLPE cable. The temperature field, flow field, steady electric field, and transient electric field of the cable under DC operation are obtained by simulation. The cable-laying methods consisting of soil, pipeline, and trench under the bipole, monopole, and triple DC topologies are analyzed. The results show that the cable in the trench and tripole DC operation has the highest ampacity, while the cable in the pipeline and monopole DC operation has the lowest ampacity. The range of the DC voltage levels of the cable in the aforementioned laying modes and DC topologies is ±10~11 kV. The maximum transmission power of the cable in the trench and monopole DC operation is the highest, while that of the cable in the pipeline and bipole DC operation is the lowest. The maximum transmission power of the AC cable significantly increases under DC operation.