Increasing Reliability of XPLE-Insulated Cables: FEA-Based Ampacity Calculation and Online Monitoring of Insulation Degradation

The length of service of a HV power cable line is determined by accurate prediction of its temperature state during normal and emergency operation. In addition to calculating line ampacity according to IEC 60278 standard, it is proposed to use FEM simulation to account for mutual electromagnetic and thermal influence of several cable lines.During the operation of the line it is necessary to monitor online the parameters reflecting the degradation of the cable insulation. Gradual degradation of cable insulation is a complex physical and chemical process. It is reflected in some electrically measured parameters available for long-term monitoring without interrupting normal operation.The frequency dependence of loss factor tan δ is proposed as a parameter that is sensitive to cable degradation. Proposed the way of estimation of residual resource of cable line by analyzing the rate of change of frequency dependency of loss factor.