Short -- Circuit Temperature Ratings of Buried Extruded Dielectric Cables

This paper describes a computer program which can calculate the steady state and. transient temperature distribution in underground extruded dielectric power cables. The transient, conditions are assumed to be caused by short-conditions and the subsequent circuit breaker reclosure cycles. The program is a design tool that can be used to predict cable properties, geometries and operating conditions which can lead to safe temperatures under steady and transient conditions. The analysis results from an energy balance on up to four cable materials and the earth. The energy equation is solved by an implicit finite difference technique. The analysis includes dielectric losses, skin effect, circulating shield currents and mutual heating between cables. Both steady state and transient results are compared with available data.