Study on Design and Feasibility of Acrylic-Based Repair Liquid for Buffer Layer Ablation Failure

In recent years, the frequent occurrence of high-voltage cable buffer layer ablation faults seriously threatens the safe and stable operation of the power system. In order to eliminate the hidden danger of high-voltage cable ablation, a kind of buffer layer ablation fault repair liquid with acrylic resin as the matrix was designed in this paper. The influence of the repair liquid on the electrochemical corrosion of aluminum sheath was analyzed, and the application performance of the repair liquid was tested. The results shown that the repair liquid prepared with acrylic resin as the matrix, ethyl acetate as the solvent, and carbon black as the conductive filler adhered well to the buffer layer. In addition, the repair liquid formed an acrylic resin-carbon black coating in the ablative buffer layer. The corrosion current density of aluminum in the mixed liquid of water-blocking powder and acrylic resin was about 9.72 × 10–4 μA/cm2. Therefore, the acrylic-based repair liquid did not cause new electrochemical corrosion problems in a short time after injection into the cable. The repair liquid, at low viscosity, was able to reduce the volume resistivity of the ablative buffer layer, and cured quickly at a certain temperature by evaporating. The study provided a reference for the repair of high voltage cable ablation fault.