Abstract
The hot-spot temperature of a dry-type air-core reactor is a crucial factor that determines the service life of the reactor. Although the environment elevation has a significant influence on the reactor’s heat dissipation performance and hot-spot temperature, studies seldom focus on the temperature distribution for different altitude scenarios. To this end, this paper proposes a temperature field simulation model with multi-parameter coupling constraints based on the laminar–turbulent flow state. The calculation of the temperature field with the hot-spot temperature at different altitudes is finally achieved. The simulation results show that the hot-spot is located at 6.3% from the top of the sixth encapsulated-winding. It also shows that the hot-spot temperature of the reactor increases by 5 K–11 K with the altitude ascending by 1 km. Moreover, the hot-spot temperature of the reactor exceeds the temperature index at an altitude of 3.25 km, which will result in a shortened service life. Fiber Bragg grating temperature sensors are embedded in encapsulated-windings to detect the temperature for verifying the validity of the temperature field model, which could provide critical temperature rise evaluation rules for the operation safety of the dry-type air-core reactor.
Highlights
The dry-type air-core reactor is one piece of important power equipment widely used in long-distance power transmission projects with ultra-high voltage in an alpine plateau
The temperature of the hot-spot increases by 5 K–11 K when the altitude increases by 1 km, and the service life of the reactor is reduced by about 1/3–2/3
The proposed calculation model is verified with the measurements by using the all-dielectric fiber Bragg grating (FBG) temperature sensor
Summary
The dry-type air-core reactor is one piece of important power equipment widely used in long-distance power transmission projects with ultra-high voltage in an alpine plateau. Jiang et al. designed a three-dimensional temperature rise calculation model for the dry-type air-core reactors including star-shaped supports, whose thermal loss is 3.7% of the encapsulation loss and modifies the encapsulation hot-spot for 3 K. According to the solution results, a laminar–turbulent flow convective heat transfer model is built, and the temperature field characteristics of the reactor at different altitudes with the hot-spot temperature rise rule are obtained. To verify the accuracy of the model, the all-dielectric FBG temperature sensors are embedded in the reactor EW to detect the temperature of the seven EWs of the dry-type air-core reactor under rated operating conditions It provides a theoretical basis for reactor material selection and reactor fault prediction in high altitude areas
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