An assessment of conductor temperature rises of cables, caused by a sudden application of short pulse in a daily cyclic load

The method for calculating cyclic and emergency current power cable ratings has been elaborated for many years and has been standardized in form of IEC standards based on the application of a step function. To achieve a better accuracy, a computer method has been developed, based on finite difference approaches. With the propose procedures, this paper provides a sound basis for the accurate evaluation of temperature rises of conductor in cyclic load calculations. In addition, it proposes a compression-decompression approach for evaluating the temperature rise of the conductor, caused by the application of rectangular current pulses in daily cyclic load.