Research on the fast calculation model for transient temperature rise of duct laying cable

For improving the efficiency of three-phase cable transient temperature calculation and the efficiency of rack pipe laying design, meeting the needs of running real-time analysis, a thermal circuit model of lumped parameter is established. It is used to quickly get the transient temperature rise of cable core and outer sheath. After the model is established, the accurate results of the transient temperature rise of the core and outer sheath can be obtained through the calculation of the simple hot path and the real-time correction of the loss directly. In this paper, a practical engineering example is given. This paper shows the convenience and accuracy of the quick calculation model mentioned by comparing the calculation results of the model and the calculation results of general software.