Short-Circuit Conditions and Thermal Behaviour of Different Cable Formations

Modern electrical installations widely use cable formations consisting of a few single cables connected in parallel. In this article, the short-circuit problem is analysed with its influence on cable temperature. In the assumed case study of supply lines, five equivalent cases were considered. Calculations of temperature increase during faults were performed using a simplified method and FEM model. This study shows the differences in calculation methods and points to better solutions in cable arrangements due to safety and operating conditions in cases of faults. Additionally, some problems in the simplified method were identified and pointed out in the range of its application.