ANSYS-based crosslinking polyethylene insulated cable temperature field finite element calculation method

Abstract

The invention discloses an ANSYS-based crosslinking polyethylene insulated cable temperature field finite element calculation method. The method successively comprises the following steps: firstly, taking a crosslinking polyethylene insulated cable as a research object and performing parametric geometric modeling based on a simulation software ANSYS, secondly, applying current excitation to the crosslinking polyethylene insulated cable to perform magnetic field analysis, applying voltage excitation to the crosslinking polyethylene insulated cable to perform electric field analysis then, and simultaneously loading joule heat loss, eddy-current loss and medium loss obtained from the magnetic field analysis and the electric field analysis to the crosslinking polyethylene insulated cable to be taken as heat sources, perform temperature field analysis and perform calculation of a crosslinking polyethylene insulated cable temperature field. The method has great flexibility and adaptability of solving for complex regional and border problems, can more accurately calculate the temperature of a crosslinking polyethylene insulated cable conductor, and then can explore the potential of cable current carrying capability; and the method can save cable investment, and also can improve the cable utilization rate and cable operating level.

Description

technical field [0001] The invention relates to the technical field of power cables, in particular to an ANSYS-based finite element calculation method for the temperature field of cross-linked polyethylene insulated cables. Background technique [0002] With the wide application of power cables in transmission and distribution lines, it is of great significance to accurately determine the distribution of the temperature field of power cables and their surrounding environment and the ampacity of cables to improve the utilization rate of power cables and dynamically adjust the load of power cables. [0003] Nonlinear loads account for an increasing proportion of electrical loads in industrial and commercial power systems. Nonlinear loads distort the sinusoidal waveforms of current and voltage in the grid, thereby generating a large number of harmonics. Power companies use a large number of capacitor banks to improve power factor, and the industry widely uses power electronic c...

AI Technical Summary

Problems solved by technology

The analytical method can accelerate the calculation speed on the basis of satisfying the accuracy for relatively simple cases, but for complex cable groups, when calculating the skin effect, proximity effect, and eddy current loss at the same time, the analytical method has too large a set of equations and is difficult to solve. shortcoming

Common numerical calculation methods such as finite difference method and boundary element method also have deficiencies. Specifically, the use of finite difference method analysis is suitable for the situation where the shape of the laying area is simple, and the error is large for more complex areas.

When using the BEM analysis, when dealing with the problem of laying multiple cables or an actual cable trench problem with multiple layers of soil, the boundaries of the BEM are too many and too complicated, and the amount of calculation is very large

Images