A lumped parameter model is proposed to improve the calculation efficiency of transient temperature riseof buried single-core cable. In order to build the model without monitoring jacket temperature

balancing thermalresistance and inductance are used to simulate the time-variant characteristic in the process of thermal diffusion. Inthe case study

the temperature rise under the same condition is obtained respectively by the lumped parametermodel

finite element method

and CYMCAP. The comparative results show that the lumped parameter model isconsistent with the other two methods

which verifies the accuracy of the method proposed in this paper. Besides

themodel is optimized by building models considered the effects of cable heat and environment temperature

respectively

based on the superposition principle of heat conduction

so that the algorithm can adapt to the changeof environment temperature wells.