HVDC Cable Ampacity Calculations Explained [Technical Webinar]

This webinar provides in-depth technical guidance on HVDC cable ampacity (current rating) calculation, focusing on advanced methodologies for electrical engineers and high-voltage cable system designers. Using the ELEK Cable High Voltage software (ELEK.com), we review the thermal and dielectric stress limitations defining operational limits for high-voltage DC cables. Topics Covered: HVDC Cable Current Rating Fundamentals: Detailed explanation of the impact of thermal constraints and dielectric stress on HVDC cable current-carrying capacity. Discussion includes stress-limited (electrical) ampacity and temperature-dependent changes in insulation conductivity and electric field distribution. Field Inversion in HVDC Cable Insulation: Analysis of field inversion, where maximum electrical stress shifts from the inner to the outer insulation as conductor temperature rises. Understanding the necessity of accounting for thermal and stress-limited ampacity in cable design. Installation Scenario Analysis: Cables in air: Influence of conductor size, material, system voltage, and ambient conditions on ampacity values. Buried cables: Effects of soil dry-out, burial depth, cable separation, and duct installations; results validated with Finite Element Method (FEM) simulations. Tunnel installations: Study how tunnel length, depth, and airflow impact ampacity in ventilated environments. Analytical and Numerical Calculation Methods: Step-by-step comparison of IEC 60287 analytical equations with numerical FEM approaches to calculate both thermal and stress-based current rating limits. Detailed procedure for determining insulation temperature drop related to dielectric stress constraints. Optimisation of Power Transmission Capacity: Technical review on how conductor size, operating voltage, and insulation thickness affect maximum transmissible current. Guidance on identifying the optimal operating voltage for cable systems, acknowledging that maximum current may not correspond to rated voltage. Validation and Case Studies: Examination of real-world examples and case studies, including parametric sensitivity analyses, confirming model predictions and software outputs. Practical recommendations for addressing variations due to soil drying, duct installations, and tunnel ventilation. Who Should View: This content is intended for professional electrical engineers, system planners, consultants, and cable designers involved in HVDC and high-voltage cable specification, rating, or verification. It is especially relevant for those seeking technical best practices using ELEK Cable High Voltage software in accordance with IEC and CIGRE methodologies. Visit elek.com for more information about high-voltage cable rating calculations and the ELEK Cable High Voltage software. Keywords: HVDC cable ampacity, high-voltage cable current rating, ELEK Cable High Voltage, cable sizing software, IEC 60287, CIGRE TB 880, HV cable rating calculation, dielectric stress, thermal ampacity, FEM cable analysis, field inversion, buried cable current, tunnel cable installation, parametric analysis, and cable system design.