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.
Highlights
Along with the development of smart grids, the stable operation of high-voltage cables, as important carriers of electric power transmission, is conducive to guaranteeing the quality of a power supply and improving the safety and reliability of power transmission lines [1,2,3]
When the cable is in operation, different ambient temperatures affect the temperature exchange between the cable trench and the outside world, and its temperature distribution changes
We propose a method for the long-distance temperature monitoring of cable lines using the Raman Distributed Temperature Sensor (RDTS) system and inferring the core temperature of the cable from the cable surface temperature, which provides a possible solution to the problem of calculating the conductor temperature
Summary
Along with the development of smart grids, the stable operation of high-voltage cables, as important carriers of electric power transmission, is conducive to guaranteeing the quality of a power supply and improving the safety and reliability of power transmission lines [1,2,3]. The monitoring of the temperature of cable conductors is significant for assessing the real-time load capacity of cables and ensuring their stable and efficient operation. As a representative of non-contact temperature measurement, infrared temperature measurement technology has a faster response time and simple equipment structure, but it will be affected by infrared electromagnetic waves and environmental factors radiating from non-measurement objects, resulting in poor measurement accuracy. This method requires the noise reduction processing of the infrared imaging to obtain accurate temperature information [6,7]. Compared to infrared temperature measurement, the arrangement is flexible and allows temperature measurement at multiple locations, but it is not easy to maintain a safe electrical distance between the point sensors and equipment with high voltage levels
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