Abstract
The outdoor ultra-high voltage (UHV) dry-type air-core smoothing reactors (DASR) of High Voltage Direct Current systems are equipped with a rain cover and an acoustic enclosure. To study the convective heat transfer between the DASR and the surrounding air, this paper presents a coupled model of the temperature and fluid field based on the structural features and cooling manner. The resistive losses of encapsulations calculated by finite element method (FEM) were used as heat sources in the thermal analysis. The steady fluid and thermal field of the 3-D reactor model were solved by the finite volume method (FVM), and the temperature distribution characteristics of the reactor were obtained. Subsequently, the axial and radial temperature distributions of encapsulation were investigated separately. Finally, an optical fiber temperature measurement scheme was used for an UHV DASR under natural convection conditions. Comparative analysis showed that the simulation results are in good agreement with the experimental data, which verifies the rationality and accuracy of the numerical calculation. These results can serve as a reference for the optimal design and maintenance of UHV DASRs.
Highlights
Dry-type air-core smoothing reactors (DASR) are primary inductive devices used in ultra-high-voltage direct current (UHVDC) lines for their high linearity, low running-noise, and simple structures
±800 kV-dry-type air-core smoothing reactors (DASR) has 21 encapsulations, and it is equipped with a rain cover and an acoustic enclosure
±800 kV-DASR has 21 encapsulations, and it is equipped with a rain cover and an acoustic enclosure when operated outdoors
Summary
Dry-type air-core smoothing reactors (DASR) are primary inductive devices used in ultra-high-voltage direct current (UHVDC) lines for their high linearity, low running-noise, and simple structures. When a DASR is operated outdoors, a rain cover and an acoustic enclosure are used to protect it from aging caused by weather phenomena and increasing noise levels Such installations limit the convective heat transfer between the DASR and the air and may cause overheating. Liu et al [11] calculated the heat source of encapsulations and the temperature distribution in the reactor with a field-circuit and fluid-solid coupling model, and the simulation results agreed well with the test data. The abovementioned studies have established a foundation for research on UHVDC DASRs. To accurately determine the 3-D temperature field distribution of a DASR with rain cover and acoustic enclosure, a finite volume method (FVM) was employed to calculate the fluid and thermal field by coupled analysis, thereby discerning the distribution properties of the temperature field.
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