Heat Transfer Analysis of Different Conditions for SF$_{6}$/N$_2$ Gas-Insulated Transmission Lines

Qiao, Yu; Liang, Rui; Gao, Peng; Zhu, Si Yao; Chen, Chun Yu; Qin, Yu Xuan; Tang, Xiao Zheng

doi:10.1109/tpwrd.2020.2994928

Cited by 14 publications

(23 citation statements)

References 23 publications

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“…As shown in the figure, with an increase in the gas pressure, the temperature of the spacer decreased. A similar tendency in a model without a spacer has been reported by Y. Qiao et al [19], who showed that with an increase in the pressure, the temperature of the conductor decreased. With an increase in the pressure from 0.4 MPa to 0.6 MPa, the gas density increased from 25.2 to 38.9 kg•m −3 and the specific heat at constant pressure increased from 0.677 to 0.69 J•kg −1 •K −1 leading to the increase in the product of the density and specific heat.…”

Section: Influence Of Gas Pressure On Temperature Distributionsupporting

confidence: 85%

Temperature and Electric Field Distribution Characteristics of a DC-GIL Basin-Type Spacer with 3D Modelling and Simulation

Wan

Shan

et al. 2021

Energies

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The temperature properties of real-type direct-current gas-insulated transmission lines (DC-GIL) with a basin-type spacer were investigated by the finite element method in this paper. A horizontally installed model was established and the temperature distribution was obtained with a 3D model. The specific heat capacity and thermal conductivity of the spacer were measured and applied in the simulation. The results show that the temperature of the convex surface was slightly higher than that of the concave surface. With an increase in the SF6 pressure, the temperature of the spacer decreased, which can be attributed to the improvement of convection due to increases in the heat capacity per unit volume. With an increase in the ambient temperature, the temperature of the spacer increased linearly. The temperature difference between the inner and outer parts of the spacer increased with increases in the load current. Besides, an obvious increase in the surface electric field strength appeared under the influence of the thermal gradient compared to the results without the thermal gradient. Thus, special attention should be paid to the insulation properties of the spacer considering the influence of temperature distribution. This study evaluates both the thermal and insulation characteristics of the GIL along with the spacer under various conditions.

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Section: Influence Of Gas Pressure On Temperature Distributionsupporting

confidence: 85%

Temperature and Electric Field Distribution Characteristics of a DC-GIL Basin-Type Spacer with 3D Modelling and Simulation

Wan

Shan

et al. 2021

Energies

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“…When dealing with the simulation of charge accumulation, it costs much computing time and memory with the 3D model, even this model has been reduced to half of the original geometry. This is due to the fact that in the governing equations of ion transportation (10) and (11), the convection terms (migration terms) dominate over diffusion terms. This will cause oscillation to the solution at the boundary, further this oscillation will propagate to the gas domain [28].…”

Section: B Optimization Of Solving Methodsmentioning

confidence: 99%

“…Thus, simulation shows an obvious advantage over measurement in dealing with the surface charge characteristics of the insulator during long-term operation in real GIS/GILs. On the other hand, large current flows through the central conductor, and the thermal gradient would be established inside the pipe due to Joule heat [11]. Meanwhile, it was found that the electric conductivity of the insulator would affect the surface charge distribution characteristics [12], [13].…”

Section: Introductionmentioning

confidence: 99%

Transient Surface Charge Characteristics of DC-GIL Insulator Under Thermal-Electric Coupled Fields

Han

Wan

et al. 2022

IEEE Access

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The insulator in direct current gas-insulated transmission lines (DC-GIL) would suffer discharge risk due to surface charge accumulation under thermal-electric coupled fields. In this paper, the transient surface charge accumulation characteristics of a basin-type DC-GIL insulator is investigated via finite element method based on a three-dimension horizontally installed GIL model. The stationary temperature distribution of the model is obtained and then applied to the transient simulation of charge. Weak form partial differential equation is employed to deal with the ion transportation equation. Equations and parameters in the simulation are optimized to reduce the computing memory and time. Results indicate that the charge accumulation is accelerated due to the promotion of conduction through the insulator under thermal gradient. Higher charge density is obtained under thermal gradient. And the surface charge density of the convex surface is higher due to the promoted conduction. The highest field strength increases and the corresponding location moves along the convex surface during the transient process. This could attribute to the influence of transient charge behavior under thermal gradient on the electric field distribution. This study indicates that the thermal gradient and transient charge accumulation should be considered when dealing with the insulation characteristics of DC-GIL with insulators.INDEX TERMS Gas insulated transmission lines, insulator, surface charge, thermal-electric coupled fields.

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“…In terms of coupling calculation of magnetic-thermal-fluid model, Qiao et al [6] used finite element method and multiphysics coupling, heat transfer properties were analyzed by a three-dimensional axisymmetric GIL model under different gas pressures, conductor currents and ambient temperatures. Doukas et al [7] presented a coupled electro-thermal model for transient analysis of GIL.…”

Section: Introductionmentioning

confidence: 99%

“…Particularly, magneticthermal-fluid field is directly coupled and thermal-stress is sequentially coupled. In contrast, work [6][7][8][9][10] only considered current loss as heat source for thermal field without considering thermal influence on metal conductivity, which means the magnetic-thermal field is sequentially coupled rather than directly coupled.…”

Section: Introductionmentioning

confidence: 99%

Multi-Physical Coupling Field Study of 500 kV GIL: Simulation, Characteristics, and Analysis

et al. 2020

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With the construction of a large number of hydropower stations, transmission lines crossing a river and urban utility tunnels, gas insulated transmission line (GIL) has been applied widely due to its large transmission capacity, low environmental impact and high reliability. Accurate modelling of physical quantities and their characteristics of GIL provides a theoretical basis for its design and operation, which is of great significance to ensure the safety and reliability of GIL operation. The mathematical model and their relationship of GIL multi-physical fields are analyzed at first, upon which simulation model of GIL is built. Secondly, multi-physical coupling field model of electric, magnetic, thermal, fluid and stress field for GIL is studied, while simulation results are basically in consistent with experimental data to verify effectiveness of the model. Thirdly, distribution of multi-physical fields and their relationship are simulated and analyzed, while proximity effect, edge effect and compression factor of GIL multi-physical field are discussed. The results show that the radial temperature inside GIL is higher at the top, lower at the bottom, leading to uneven distribution of thermal expansion displacement, while the axial temperature distribution is basically uniform, which falls firstly and then rises near basin insulator thus results in edge effect. Proximity effect leads to asymmetric distribution and a slight increase of temperature inside GIL as well as a dramatic increase of air velocity around GIL. In addition, when ambient temperature is lower than-5 ℃, the compression factor is much lower than 1 and the effect of compression factor should be considered in simulation. INDEX TERMS GIL, multi-physical coupling field, finite element method, multi-physical characteristics. I.

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Heat Transfer Analysis of Different Conditions for SF$_{6}$/N$_2$ Gas-Insulated Transmission Lines

Cited by 14 publications

References 23 publications

Temperature and Electric Field Distribution Characteristics of a DC-GIL Basin-Type Spacer with 3D Modelling and Simulation

Temperature and Electric Field Distribution Characteristics of a DC-GIL Basin-Type Spacer with 3D Modelling and Simulation

Transient Surface Charge Characteristics of DC-GIL Insulator Under Thermal-Electric Coupled Fields

Multi-Physical Coupling Field Study of 500 kV GIL: Simulation, Characteristics, and Analysis

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