High voltage insulation for power cables utilizing high temperature superconductivity

Bulinski, A.T.; Densley, J.

doi:10.1109/57.753927

Cited by 29 publications

(11 citation statements)

References 25 publications

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“…Compared to Kraft paper, PPLP shows a significantly higher breakdown voltage under both AC and impulse voltages. This is in agreement with what reported in references [5,6,8,11]. This result could confirm the fact that the corona-proof of PPLP is higher than that of Kraft paper.…”

Section: Kraft Paper and Pplpsupporting

confidence: 93%

“…thickness. Similar results were presented in references [5,11]. For both positive and negative polarities, impulse breakdown voltage is about 2 times higher than AC breakdown voltage.…”

Section: Kraft Paper and Pplpsupporting

confidence: 89%

“…Recently, PPLP has been used as insulation for HTS power cable because its dielectric loss is smaller than that of Kraft paper and nearly the same with oriented polypropylene laminated. In addition, the breakdown strength of PPLP was observed to be higher than that of Kraft paper, but its lifetime index is smaller than that of Kraft paper [5,6]. The studies on the use of PPLP as ________ tape insulation for HTS cable were carried out [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Breakdown Characteristics of Composite Insulation for High Temperature Superconducting Cable

Dung,

Truong

2021

MaP

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Polypropylene laminated paper (PPLP) and Kraft paper have been studied as multi-layer insulation for high temperature superconducting cable. The experiment was examined with AC and impulse voltages. Short-term and long-term breakdown of insulation samples were investigated. It was found from the experimental results that the breakdown voltage becomes smaller in the order of PPLP, PPLP/Kraft and Kraft, but the lifetime index increases with the presence of Kraft layer in the multi-layer insulation. In addition, the position of PPLP layers has a significant effect on the breakdown voltage of PPLP/Kraft samples under positive impulse voltage. Finally, breakdown mechanism of PPLP/Kraft composite insulation was suggested. Partial discharges in butt-gaps and in the porous structure of insulation layers combined with electric discharges on the surface of these layers are considered to be main factors causing the puncture of multi-layer insulation.

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Section: Kraft Paper and Pplpsupporting

confidence: 93%

“…thickness. Similar results were presented in references [5,11]. For both positive and negative polarities, impulse breakdown voltage is about 2 times higher than AC breakdown voltage.…”

Section: Kraft Paper and Pplpsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Breakdown Characteristics of Composite Insulation for High Temperature Superconducting Cable

Dung,

Truong

2021

MaP

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“…The dielectric losses in high voltage HTS cables are dependent on the dielectric properties, i.e. the relative permittivity and dissipation factor which are dependent on frequency as well as on operating temperature [2] [12].…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of Dielectric Losses of PPLP for Single Phase HTS Cable at Subcooled LN₂ Temperatures

Sarkar

Souza

Sarkar

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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For the operation of high-temperature superconducting (HTS) power cables in liquid nitrogen (LN2 ) at high voltage levels, there is a need for reliable and cost-effective insulating materials. This article investigates the dielectric losses in poly-propylene laminated paper (PPLP- Sumitomo) which is used as a cold dielectric for HTS cables. To calculate the dielectric losses, an experimental setup was developed to measure the relative permittivity of PPLP at different temperatures from 65 to 300 K at various frequencies. Using an in-house developed experimental setup, the dielectric loss for different layers of PPLP, at various temperatures and operating frequencies was estimated to evaluate one of the criteria of cold dielectric material and the same was compared with the data at room temperature. The temperature was reduced to 65 K using a vacuum pump-assisted sub-cooling system. The effective relative permittivity increases marginally for subcooled LN2 impregnated PPLP, however there is reduction in tan delta loss which in turn reduces the dielectric loss and is useful for high voltage HTS based AC cables. This paper provides a comparative study on PPLP performance variation with respect to operating temperature and frequency.

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“…Polypropylene laminated paper (PPLP), which is developed by J-Power company in Japan and composed by 2 layers kraft and 1 layer Polypropylene (PP) has good dielectric and mechanical characteristics in liquid nitrogen environment. So PPLP is widely used as lapped dielectric materials for HTS cables [4]- [6]. However, it is proved that some other polymer sheet materials such as polyimide and PTFE are also suit for cryogenic environment.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Characteristics of Laminated Paper and Polymer Sheets Used for Lapping Dielectric Structure at 77 K

Yang

Song

Cao

et al. 2014

IEEE Trans. Appl. Supercond.

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110 kV cold dielectric high temperature superconducting (HTS) cable has been developing in China. Generally, the lapped dielectric structure is adapted for cable body, so dielectric characteristics of dielectric sheets are very important. Polyimide, Polypropylene laminated paper (PPLP) and polyimide and poly tetra fluoro ethylene (PTFE) are widespread dielectric sheet materials for HTS equipments with lapped structure. In this paper, the lightning impulse dielectric strengths of three materials under tensile statuses are tested by a special electrode system. The experimental results are processed by method of Weibull plot. As a result, the impulse dielectric strengths of all three materials have good adaptive capacity for tensile stresses in liquid nitrogen. The impulse dielectric strengths of polyimide are highest of three materials under normal using stresses. The AC dielectric strengths of three materials are also concluded from previous papers. Combining experimental results, data in previous papers and design methods related, the multi-layered dielectric thickness and layers of PPLP used for 110 kV cold dielectric HTS cable body are designed.Index Terms-Cold dielectric high temperature superconducting (HTS) cable, dielectric design, impulse dielectric breakdown strength, lapped dielectric structure.

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High voltage insulation for power cables utilizing high temperature superconductivity

Cited by 29 publications

References 25 publications

Breakdown Characteristics of Composite Insulation for High Temperature Superconducting Cable

Breakdown Characteristics of Composite Insulation for High Temperature Superconducting Cable

Experimental Evaluation of Dielectric Losses of PPLP for Single Phase HTS Cable at Subcooled LN₂ Temperatures

Dielectric Characteristics of Laminated Paper and Polymer Sheets Used for Lapping Dielectric Structure at 77 K

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High voltage insulation for power cables utilizing high temperature superconductivity

Cited by 29 publications

References 25 publications

Breakdown Characteristics of Composite Insulation for High Temperature Superconducting Cable

Breakdown Characteristics of Composite Insulation for High Temperature Superconducting Cable

Experimental Evaluation of Dielectric Losses of PPLP for Single Phase HTS Cable at Subcooled LN2 Temperatures

Dielectric Characteristics of Laminated Paper and Polymer Sheets Used for Lapping Dielectric Structure at 77 K

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Experimental Evaluation of Dielectric Losses of PPLP for Single Phase HTS Cable at Subcooled LN₂ Temperatures