In this article, a portable XLPE cable insulation detection device is introduced. Such a device utilizes electromagnetic coupling, UHF electromagnetic wave and acoustic emission to detect partial discharge signals in power cables. By analyzing the partial discharge signals and cable temperatures, the insulation status of XLPE power cables is judged.

Current researches of material engineering give little investigations on the construction impacts of soil consolidation material property. Based on the Shanghai tunneling case, the excavation mechanics analyses for shield tunnels are conducted considering soil consolidation material property using 3D (three-dimensional) finite element numerical simulation method. The longitudinal deformation behaviors for existing tunnel after the completion of shield tunnel excavation are obtained under several typical cases of soil consolidation, including one month later, one year later, and ten years later. It is shown that the consolidation material property has a significant post-construction time effects on the vertical displacements of existing tunnels. The stringent stipulations on controlling the deformation for buried structures and strengthened monitoring measures are necessary and substantial for reducing potential service risks according to the post-construction state.

This paper introduces the electric cable partial discharge detection technology and elaborates pulse waveform characteristics of cable partial discharge, PD signal’s detection theory and basic method of cable PD source localization. On this basis, application examples of substation cable-site detection are given.