Numerical Calculation of Real-Time Ampacity of High Voltage Power Cable Duct Laying Based on Environmental Information

In order to fully utilize the current-carrying capacity of power cables, it is demanding to accurately calculate cables real-time ampacity. In this point of view, a real-time ampacity calculation methodology based on environmental information is proposed. Firstly, a coupled multi-physics cable model is constructed. Secondly, the real-time environmental information is obtained based on a thermocouple and a distributed optical fiber temperature measurement system (DTS). Based on these, the real-time ampacity of cables is calculated by Newton method. The numerical results on a case study indicate that the real-time ampacity calculated by using the proposed methodology is approximately 39.08% higher as compared to the nominal ampacity.