Heat Transfer Characteristics of Gas Spacer Cables

Itaka, K.; Araki, T.; Hara, T.

doi:10.1109/tpas.1978.354649

Cited by 22 publications

(4 citation statements)

References 3 publications

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“…From the above obtained power losses, the temperature increase of the busduct (or GIL) phase conductors and shields are determined for each of the phases as follows (equations are here provided for the phase L1 only), [24,25,26 (15) and (16), with particular emphasis on the wind influence, consult [25]. These equations were in-fact derived by the application of the well-known Stefan-Boltzman formula for the radiative heat transfer, where various constants have been experimentally obtained, see [25] for additional information and necessary explanations.…”

Section: Power Losses and Temperature Increasementioning

confidence: 99%

Coupled Electromagnetic and Thermal Analysis of Single-Phase Insulated High-Current Busducts and GIL Systems

Sarajčev¹,

Martinac²,

Radic³

2013

AJEEE

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This paper presents a mathematical model for the coupled electromagnetic and thermal analysis of the single-phase insulated high-current busducts of circular cross-section geometry and of gas-insulated transmission lines (GIL). The mathematical model, accompanied by a numerical solution procedure, features an exact current distribution in phase conductors and shields of the busduct or GIL system, accounting for the skin and proximity effects, and including the complete electromagnetic coupling between phase conductors and shields. The current distribution is based on the conductor filament method in combination with the mesh-current method. The mathematical model further couples the analysis of current distribution with the computation of (Joule) power losses and subsequent temperature increase in the high-current busducts or GIL systems, accounting for the material properties (electrical conductivity, thermal emission and convection coefficients) as well as for the surrounding ambient properties (ambient temperature, wind and solar radiation influences).

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Section: Power Losses and Temperature Increasementioning

confidence: 99%

Coupled Electromagnetic and Thermal Analysis of Single-Phase Insulated High-Current Busducts and GIL Systems

Sarajčev¹,

Martinac²,

Radic³

2013

AJEEE

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“…The temperature rise in the conductor and the tank surfaces can be calculated using the following equations which consider the effects of thermal emissions to the exterior from the heating due to current and the convection/radiation [13,14].…”

Section: Temperature Rise In the Conductor And Tank Surfacementioning

confidence: 99%

A fundamental study on electrical insulation of N₂/SF₆ gas‐insulated electric power apparatus

Sato

Morita

Kikkawa

et al. 2002

Electrical Engineering Japan

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SUMMARYIn this paper, we carried out a case study on fundamental insulation design for the application of N 2 /SF 6 gas mixtures to a 275-kV gas-insulated busbar. First, we investigated the impulse ratio in N 2 /SF 6 gas mixtures and point out that the insulation design might be based on the negative switching impulse voltage in the case of lower SF 6 content. Second, we estimated the tank diameter and SF 6 gas amount with consideration of the electric field strength on conductor surface and temperature rise in gas mixtures. We clarified that the tank diameter at the lower SF 6 content is mainly determined by the electric field strength on the conductor surface and quantified the optimum gas pressure and SF 6 content for a target reduction of SF 6 gas amount.

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“…During the operation of HVDC energy transmission systems, the conductor temperature fluctuates because of Joule heating caused by changing conducting current or by longterm operation, can sometimes reach up to 90 °C [27,28]. This implies that, in the case where energy transmission occurs, the temper ature of the conductor could be in the range from ambient temperature to very high temperatures in some regions while operating under heavy load conditions [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Tailoring charge transport in epoxy based composite under temperature gradient using K₂Ti₆O₁₃ and asbestine whiskers

He¹,

Lin

et al. 2018

J. Phys. D: Appl. Phys.

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The solid-gas interface flashover performance of insulators under dc is influenced to a considerable extent by the residual charge effect. The investigation of the charge origin and charge transport in dielectric materials is a significant topic. In this work, the Al 2 O 3 -filled epoxy resin composite was manufactured as the basic dielectric composite. To investigate the charge transport behavior and restrain the charge injection under the temperature gradient, asbestine and K 2 Ti 6 O 13 whiskers were doped into the basic matrix and post type model insulators were prepared. Experimental results demonstrate that the introduction of K 2 Ti 6 O 13 whiskers can effectively restrain heat propagation due to its excellent thermal barrier property, which can restrain the charge transport under temperature gradient to some extent. The charge injection level increases for insulator doped with asbestine whisker, which is due to the introduction of large amounts of shallow traps with trap level density ranging from 0.75-0.91 eV. This work is helpful to understand DC charge transport behavior under temperature gradient and provides important significance in design of a suitable insulator inside HVDC GIL.

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Heat Transfer Characteristics of Gas Spacer Cables

Cited by 22 publications

References 3 publications

Coupled Electromagnetic and Thermal Analysis of Single-Phase Insulated High-Current Busducts and GIL Systems

Coupled Electromagnetic and Thermal Analysis of Single-Phase Insulated High-Current Busducts and GIL Systems

A fundamental study on electrical insulation of N₂/SF₆ gas‐insulated electric power apparatus

Tailoring charge transport in epoxy based composite under temperature gradient using K₂Ti₆O₁₃ and asbestine whiskers

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Heat Transfer Characteristics of Gas Spacer Cables

Cited by 22 publications

References 3 publications

Coupled Electromagnetic and Thermal Analysis of Single-Phase Insulated High-Current Busducts and GIL Systems

Coupled Electromagnetic and Thermal Analysis of Single-Phase Insulated High-Current Busducts and GIL Systems

A fundamental study on electrical insulation of N2/SF6 gas‐insulated electric power apparatus

Tailoring charge transport in epoxy based composite under temperature gradient using K2Ti6O13 and asbestine whiskers

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Product

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A fundamental study on electrical insulation of N₂/SF₆ gas‐insulated electric power apparatus

Tailoring charge transport in epoxy based composite under temperature gradient using K₂Ti₆O₁₃ and asbestine whiskers