Transient Temperature Rise Calculation for Power Cable in Ducts under Periodical Current

Transient temperature rise calculation is necessary for electrical engineers to obtain the accurate cable core temperature under cyclic current condition and manage power cable load. A lumped parameter transient thermal circuit model has been developed to evaluate the real-time transient temperature rise of the power cable in ducts. The temperature rise of each cable is divided into self-heating temperature rise caused by the heat in this cable and mutual-heating temperature rise caused by nearby other cables. Because it is difficult to calculate the value of thermal parameters in the lumped parameter model, all parameters are obtained with generic algorithm. The fitness function is the difference between transient thermal circuit analysis results and CYMCAP calculation results. The results obtained form the model agree with the accurate results obtained from CYMCAP well. It proved that the model can be used as a straightforward tool to calculate the transient temperature rise of power cable in ducts under periodical current.