The high voltage design of superconducting power transmission systems

Forsyth, E.B.

doi:10.1109/57.63054

Cited by 30 publications

(4 citation statements)

References 9 publications

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“…With these constraints in measuring the above listed intrinsic properties, Swanson et al [15] suggested a relationship given by equation (1) to correlate the dielectric strength E with volume resistivity, relative permittivity and loss tangent.…”

Section: Introductionmentioning

confidence: 99%

“…THE discovery of high temperature superconductivity (HTSC) in 1986 sparked a fresh interest in research in this area so that they are put to industrial applications [1][2][3][4][5]. In practical HTSC devices, equipments and systems use of liquid nitrogen (LN 2 ) play a crucial role in applying high temperature superconducting materials to the apparatus; LN 2 being used as not only a coolant but also an insulating medium.…”

Section: Introductionmentioning

confidence: 99%

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Breakdown strength of solid dielectrics in liquid nitrogen

Masood

Zuberi

Husain

2008

IEEE Trans. Dielect. Electr. Insul.

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The objective of this research was to determine if a relationship could be found between dielectric strength and other properties of electrical insulating materials in the medium of liquid nitrogen on an empirical basis by using variables predicted by basic theory. A simple equation of the form E=A+Blog (ρ v /ξ r tanδ) to predict the dielectric strength of a solid insulating material in liquid nitrogen medium has been proposed. The equation requires the values of volume resistivity (ρ v ), relative permittivity (ξ r ) and loss tangent (tanδ) in the medium of liquid nitrogen, which may be obtained easily by low voltage non-destructive measurements. The values of electric strength calculated using this equation for Crepe paper, Kraft paper, varnished paper, pressboard, presspahn, mica, bakelite and asbestos are quite in agreement with the experimentally measured values. It is expected that the equations obtained will help the designers as a handy tool for quick estimation of breakdown strength of solid dielectrics dipped in liquid nitrogen.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Breakdown strength of solid dielectrics in liquid nitrogen

Masood

Zuberi

Husain

2008

IEEE Trans. Dielect. Electr. Insul.

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“…G ENERALLY, liquid nitrogen were adopted for cryogenic liquids and insulating media for high temperature superconducting devices [1], [2]. As for insulating characteristics of itself, it has insulating performance comparable to insulating oil which is widely used for conventional electric equipment for insulating media [3], [4].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Uniform and Non-uniform Breakdown Characteristics of Liquid Nitrogen With Different Electrode Materials

Shin

Seong

Hwang

et al. 2012

IEEE Trans. Appl. Supercond.

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High temperature superconducting devices utilize liquid nitrogen both for cryogenic liquids and insulating media. Regarding the insulating performance of , it shows excellent characteristics comparable to insulating oil which is widely used for conventional electric equipment. But, detailed complex insulating structure in composed of cryogenic liquids, solid insulating material and conductor material has not been fully considered yet. In order to commercialize superconducting devices, insulating characteristics of should be analysed and confirmed to the level of insulating oil. In this work, we focused on the breakdown characteristics of especially for different electrode materials. Aluminum, Stainless steel, and Copper electrode systems were fabricated and tested in to verify uniform and non-uniform characteristics of according to the electrode materials. AC withstand voltage test and lightning impulse test has been performed. From the test results, it was revealed that the breakdown voltages were significantly changed according to the electrode materials. Especially for Stainless steel, it shows prominent enhancement of breakdown voltage compared to copper and aluminum electrode in . Consequently, it was deduced that optimum choice of conductor materials in is another critical factor to determine complex insulating performance of superconducting devices.

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“…Furthermore, studies [4]- [6] have been undertaken for practical insulation design of superconducting power apparatus.…”

Section: Iintroductionmentioning

confidence: 99%

Electrical breakdown of Liquid Nitrogen viewed from area & volume effects

Masood¹,

Zuberi²,

Husain³

2008

2008 12th International Middle-East Power System Conference

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Liquid Nitrogen (LN 2 ) plays a crucial role in applying high temperature superconducting (HTSC) materials to the power apparatus. However limited literature is available pertaining to design of practical insulation for HTSC devices using LN 2 . This study attempts to investigate the area and the volume effects on the electrical breakdown strength in LN 2 so as to obtain better design of electrical insulation for superconducting power apparatus. Measurements were made to assess the ac breakdown voltages in LN 2 utilizing sphere-plane electrode configuration. Experimental results revealed that the breakdown voltage in LN 2 did not increase monotonously but decreased partially as the sphere diameter increased at a constant gap length. The ac breakdown voltages in LN 2 were also measured for coaxial cylindrical electrode geometry to examine the area & volume effects and the breakdown voltage showed a decrease with an increase in 90% stressed electrode area (SEA) 90 and 90% stressed liquid volume (SLV) 90 .

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The high voltage design of superconducting power transmission systems

Cited by 30 publications

References 9 publications

Breakdown strength of solid dielectrics in liquid nitrogen

Breakdown strength of solid dielectrics in liquid nitrogen

Evaluation of Uniform and Non-uniform Breakdown Characteristics of Liquid Nitrogen With Different Electrode Materials

Electrical breakdown of Liquid Nitrogen viewed from area & volume effects

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The high voltage design of superconducting power transmission systems

Cited by 30 publications

References 9 publications

Breakdown strength of solid dielectrics in liquid nitrogen

Breakdown strength of solid dielectrics in liquid nitrogen

Evaluation of Uniform and Non-uniform Breakdown Characteristics of Liquid Nitrogen With Different Electrode Materials

Electrical breakdown of Liquid Nitrogen viewed from area &#x00026; volume effects

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Electrical breakdown of Liquid Nitrogen viewed from area & volume effects