Transient Thermal Performance of Power Cable Ascertained Using Finite Element Analysis

Abstract

This paper presents the computation of the cable ampacity and the temperature distribution through long duration based on the equivalent thermal circuit based on IEC 60287 standard and the Finite element method using COMSOL (Multiphysics environment, version 5.5). This study investigated the cable ampacity and the temperature rise of the cable core and sheath at steady state and emergency conditions. The cable ampacity was investigated at different conditions such as the variation of cable depth, soil properties, and soil temperature. The results confirmed the adaptation between the thermal circuit results and the COMSOL results as well as the effectiveness of using the numerical method to compute the cable ampacity. Using the COMSOL-based thermal properties evaluations, the transient performance of the cable is ascertained. The transient study is performed for different cable loading currents and dry zone sizes.

A Method for Determining the Impact of Ambient Temperature on an Electrical Cable during a Fire

“…Determining the equivalent heat losses R and C from the cable to the environment is a very important stage for calculating the T erfc (x, t) model determined by Equation ( 14). They impact the shape of the model temperature curves and the process accuracy of the temperature modelling as a function of time and distance from the heat source [6,32].…”

“…According to these models, heat losses caused to the environment are treated as global and do not specify individual components in the loss balance. The calculation algorithms of these models use the finite element method (FEM) [6] and assume stationary conditions of the electric current flow through single, multi-layer, or bundled cables. For similar current flow conditions, t pervious works have proposed a thermal model for the cable based on experimentally determined time constants for heating the electric cable [7].…”

A Multiphysics Analysis of Coupled Electromagnetic-Thermal Phenomena in Cable Lines

“…The flowchart of the computation routines is depicted in Figure 3. For the case of buried cables there are additional problems due to soil inhomogeneity [35,36,46,47] and heat exchange conditions between the cable shield and the soil or the backfill material [36,39,46,[48][49][50].…”

Conductor Temperature Monitoring of High-Voltage Cables Based on Electromagnetic-Thermal Coupling Temperature Analysis

“…The above methods are usually used to detect the surface temperature of high-voltage cables, but the direct measurement of the conductor temperature of the cable is difficult to achieve. At present, the main estimation methods for the conductor temperature of power cables include the equivalent thermal circuit models [14,15], artificial intelligence algorithms [16], and finite element analysis [17][18][19]. IEC 60287 is the standard for the equivalent thermal circuit method, which provides a complete analysis method and formula for calculating the load capacity [20].…”