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

Abstract

As a key state parameter of high-voltage cables, conductor temperature is an essential determinant of the current carrying capacity of cables, but in practice, this is difficult to measure directly during the operation of high-voltage cables. In this paper, the electromagnetic-thermal coupling analysis model of a 110 kV high-voltage cable is established using the finite element analysis software COMSOL. By analyzing the temperature distribution law of high-voltage cables under different load currents and ambient temperatures, the relationship between the change in the high-voltage cable surface temperature and the conductor temperature is deduced, which allows the monitoring of the high-voltage cable conductor temperature. Taking the 110 kV cable of the Yanzhong line in Shanxi Province as an example and using the electromagnetic-thermal coupling temperature field analysis method, the conductor temperature of the high-voltage cable can be measured using the data obtained from the cable surface temperature, which is measured by the self-developed Raman Distributed Temperature Sensor (RDTS) system with a maximum measurement error of about 2 °C. The method is easy to use and can achieve the accurate measurement of the conductor temperature without damaging the cable body.

A precise inversion method of cable joint core temperature with non-embedded detection based on UMAP and ISSA-BPNN

“…Due to its ease, monitoring the temperature of the cable surface for non-embedded internal core temperature detection has attracted much interest lately. Numeric methods include the thermal circuit method (Swift et al, 2001;Liang, 2016) and the finite element method (FEM) (Klimenta et al, 2011;Ghoneim et al, 2021;Zhang et al, 2022). The former was proposed by Neher (1949) since the Kennelly hypothesis (Neher and Mcgrath, 1957) was put forward.…”

Analytical Review of Electromagnetic Field Monitoring Systems for Primary Aluminum Production Plants

“…В этом заключается одна из проблем алюминиевых электролизеров. Приблизить решение данного вопроса можно, изучая схемы течения в плоском резервуаре электролизера, содержащего проводящую жидкость, через которую ток протекает поперек слоя (площадь поперечного сечения анода на верхней границе меньше площади резервуара) [19] [25].…”