Theoretical and Experimental Evaluation of the Temperature Distribution in a Dry Type Air Core Smoothing Reactor of HVDC Station

Abstract

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.

The Optimization Design of Sound Arrester for the Dry Type Air Core Smoothing Reactor Based on the Multi‐Physical Field Coupling Method

“…In Reference [5], the 2D axial symmetry model of reactor is established, and the temperature rise distribution is obtained. In Reference [6], the detailed temperature rise distribution of the reactor with the rain cover is obtained based on the 3D simulation model, and the experimental results verify the correctness of the simulation calculation method. 2.…”

“…The sound pressure can be convert to the sound pressure level by the following Equation (6). The measurement point of sound pressure level is selected according to the standard of GB/T 25092-2010.…”

“…In Reference [5], the 2D axial symmetry model of reactor is established, and the temperature rise distribution is obtained. In Reference [6], the detailed temperature rise distribution of the reactor with the rain cover is obtained based on the 3D simulation model, and the experimental results verify the correctness of the simulation calculation method. The sound pressure level of reactor: In Reference [7], the mechanism of noise generation, the characteristics of sound power level and sound pressure level of reactor are discussed based on the theoretical analysis and simulation calculation. In Reference [8], the vibration and noise analysis of shunt reactor is achieved.…”

Research on the online measuring technology of inter-turn insulation of dry air-core reactor

“…The air heat dissipation is usually used for the dry air‐core reactors even under the bad environment, which causes occasional accidents. According to the related researches, 95% of accidents were caused by the inter‐turn short circuit [4–8 ]. In order to solve the problem which causes the accident expanding, a new method of inter‐turn insulation fault online monitoring based on the change of the power angle was proposed [9 ].…”

Distribution of electric field and structure optimisation on the surface of a ±1100 kV smoothing reactor

“…2 shows a 3D model of the ±1100 kV oblique-dry-type smoothing reactor. The smoothing reactor consists of the reactor's main body, pillar insulators, grading ring, rain cover, bus bar, bus insulators, and other parts, which are presented in [16][17][18]. The reactor's main body, grading ring, rain cover, and bar parts are made of metal, the pillar insulators are mainly composed of a composite material.…”