Development of a Compressed-Gas-Insulated Transmission Line

Pedersen, B. O.; Doepken, H. C.; Bolin, P. C.

doi:10.1109/tpas.1971.292916

Cited by 16 publications

(5 citation statements)

References 4 publications

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“…Applications have included nuclear reactor design, cooling of electronic equipment, aircraft cabin insulation and thermal storage systems. The horizontal concentric cylinder geometry is used in pressurized-gas underground electric transmission cables (Pedersen, Doepken & Bolin 1971).…”

Section: Introductionmentioning

confidence: 99%

An experimental and theoretical study of natural convection in the annulus between horizontal concentric cylinders

1976

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An experimental and theoretical-numerical investigation has been carried out to extend existing knowledge of velocity and temperature distributions and local heat-transfer coefficients for naturel convection within a horizontal annulus. A Mach—Zehnder interferometer was used to determine temperature distributions and local heat-transfer coefficients experimentally. Results were obtained using water and air at atmospheric pressure with a ratio of gap width to inner-cylinder diameter of 0·8. The Rayleigh number based on the gap width varied from 2·11 × 104to 9·76 × 105. A finite-difference method was used to solve the governing constant-property equations numerically. The Rayleigh number was changed from 102 to 105 with the influence of Prandtl number and diameter ratio obtained near a Rayleigh number of 104. Comparisons between the present experimental and numerical results under similar conditions show good agreement.

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Section: Introductionmentioning

confidence: 99%

An experimental and theoretical study of natural convection in the annulus between horizontal concentric cylinders

1976

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“…By using the formulas in the literature [2]- [4] and the matrix approach in Section III, the phase and enclosure temperatures can be evaluated. The following equations allow to compute the heat transfer by both radiation and free convection: (6) from the conductor to enclosure and (7) from enclosure to the ambient air:…”

Section: Analytical Approach For Calculating Heat Transfer In Gilmentioning

confidence: 99%

Solution of coupled electromagnetic and thermal problems in gas-insulated transmission lines

Benato

Dughiero

2003

IEEE Trans. Magn.

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Gas-insulated high-voltage and extra high-voltage transmission lines are a new technology for transmitting high-power ratings over long distances. A previous paper was devoted to predict the current distribution along with the external flux density in this multiconductor system, highlighting its proximity effect. It served as the vehicle for the present further research taking into account the thermal problems coupled to the electromagnetic field. The aim of the present paper, therefore, is to show the concordance between literature analytical formulas and the finitel-element method (FEM) approach considering the concrete tunnel installations. The FEM model is able to study the precise thermal distribution inside the phase and enclosure thickness both in the steady-state regime and transient condition due to the phase-to-ground short circuit.Index Terms-Coupled electromagnetic and thermal problems, finite-element method (FEM), integral numerical method, proximity effect.

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“…The numerical solution procedure follows the central-difference, finitedifference technique outlined in [1]. The governing equations (3)(4)(5)(6)(7)(8)(9)(10)(11) to (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13) of reference [1] are solved with the boundary conditions (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) to (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17) of [1] except for changes in boundary conditions as outlined below.…”

Section: Numerical Studymentioning

confidence: 99%

“…These may be radial [12,13], conical [14], or axial [9,10]. Fluid flow and heat transfer are essentially the same as for a simple annuius when radial or conical spacers are used.…”

Section: Introductionmentioning

confidence: 99%

Natural Convection in the Annulus Between Horizontal Circular Cylinders With Three Axial Spacers

Kwon

Kuehn

Lee

1982

Journal of Heat Transfer

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Conjugate natural convection heat transfer in an annuius between horizontal isothermal circular cylinders with three equally spaced axial spacers has been studied theoretically and experimentally. A thin-fin approximation was used to model the thermal boundary condition of the spacers in the two-dimensional finite difference numerical computations. Rayleigh number, Prandtl number, diameter ratio, and location and thermal conductivity of the spacers were varied parametrically to determine the variation in flow patterns, temperature distribution and heat transfer. Spacers of low conductivity can decrease the natural convection heat transfer by as much as 20 percent below that for a simple unobstructed annuius. However, radial conduction through spacers of high conductivity overwhelms the natural convection heat transfer between the cylinders. Two diameter ratios were tested experimentally in a Mach-Zehnder interferometer using air at atmospheric pressure with stainless steel spacers between copper cylinders. The numerical and experimental temperature distributions and local convective heattransfer coefficients show good agreement.

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Development of a Compressed-Gas-Insulated Transmission Line

Cited by 16 publications

References 4 publications

An experimental and theoretical study of natural convection in the annulus between horizontal concentric cylinders

An experimental and theoretical study of natural convection in the annulus between horizontal concentric cylinders

Solution of coupled electromagnetic and thermal problems in gas-insulated transmission lines

Natural Convection in the Annulus Between Horizontal Circular Cylinders With Three Axial Spacers

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