Research on Real-time Calculation Model for Transient Temperature Rise of Direct Buried Single-core Cable

A lumped parameter model (LPM) was proposed to achieve the real-time calculation of transient temperature rise for buried single-core cable. In order to develop a model without monitoring cable surface temperature, the balanced thermal resistance and inductance were used to simulate the transient temperature characteristics in the process of heat diffusion. In the case studied, the temperature rise under the same condition was obtained with the LPM, finite element method, and commercial software (CYMCAP), respectively. The calculation results show that, the LPM can agree well with the other two methods, which verifies the accuracy of the method proposed in this paper. Furthermore, the model was improved through consideration of the effects of cable heat and environment temperature, respectively, based on the superposition principle of heat conduction. The calculation model was then promoted to be used for analysis of transient temperature rise with time-varying boundary conditions.