Electrical Insulation Characteristics of PPLP as a HTS DC Cable Dielectric and GFRP as Insulating Material for Terminations

Kim, S. H.; Choi, Jaehoon; Kim, W. J.; Kim, K. L.; Lee, H. G.; Kim, Y. S.; Jang, Hye Sook; Lee, S. K.

doi:10.1109/tasc.2011.2181470

Cited by 21 publications

(7 citation statements)

References 8 publications

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“…Special consideration must be taken when designing structural components made from plastic materials, as they typically have much lower compressive strength and toughness when compared to metals [8][9][10]. In spite of this, plastic materials are sometimes the best choice for a variety of reasons, such as manufacturing cost [11][12][13], electrical and thermal resistance [14][15][16][17], vibration absorption [18][19][20], and recycling needs [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Critical Buckling Load of Thin-Walled Plastic Cylinders in Axial and Radial Loading: Overview and FEA Case Study

Pereira¹,

Patterson²,

Lee³

et al. 2019

Preprint

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This technical note discusses the theoretical static buckling load of thin-walled plastic cylinders under axial and radial loading. While the buckling of thin-walled cylinders is a well-researched topic, a variety of new design and manufacturing methods, as well as advances in polymer technologies, have brought plastic structures into prominence in recent years, necessitating a re-examination and exploration of their behavior under buckling loads. This work provides a background review of the problem, a discussion of the appropriate buckling equations, an extensive case study to demonstrate the concepts, and a brief review of some previously developed thin-walled structure reinforcement techniques. The presented work and results are intended to provide a helpful perspective, background review, and starting place for future research on the buckling behavior of thin plastic structures.

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Section: Introductionmentioning

confidence: 99%

Critical Buckling Load of Thin-Walled Plastic Cylinders in Axial and Radial Loading: Overview and FEA Case Study

Pereira¹,

Patterson²,

Lee³

et al. 2019

Preprint

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“…Since it can transmit a large amount of electric power, a compact size is possible to make the overall construction cost lower than that of the conventional cable. The HTS cable system is basically composed of a conductor including all its constituent parts, cooling system and electric insulation [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Without viable cryogenic dielectric, there is no transmission or conversion of power [3]. Nowadays, polypropylene laminated paper (PPLP) is used as insulation in superconducting cables due * Corresponding author: hsshin@andong.ac.kr to its low dielectric loss and superior dielectric property [2,4,5]. The use of PPLP as an insulation for the electric cable application is already well-known and it has become a standard in the field of underground transmission cables.…”

Section: Introductionmentioning

confidence: 99%

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Establishment of CTE Measurement Procedure for PPLP at 77 K for HTS Power Cables using Double Extensometers

Dedicatoria¹,

Dizon²,

Shin³

et al. 2012

Progress in Superconductivity and Cryogenics

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The measurement of the coefficient of thermal expansion (CTE) of polypropylene laminated paper (PPLP) as electric insulating material is important for its practical superconducting device application. The thermal strain induced to HTS tapes and its insulating material during cooling from room temperature might largely affect the critical current (I c) of HTS tapes. In this study, the thermal contraction of PPLP material was measured during cooling from 300 K to 77 K using double extensometers. Initially, the CTE of a brass tape was measured and it was compared with a reference data. It was found that the measured thermal expansion data of the brass material approaches that of the reference one. Based on the results, it was then confirmed that the measurement technique could be applied to thin and flexible samples. Therefore, the same measurement procedure was applied to PPLP material using double extensometers. As a result, the linear CTE of the PPLP at 77 K has been measured to be ~ 15.3 x 10-6 /K. Also, it was found that the thermal contraction characteristics of PPLP was dominated by polypropylene on the cross direction (higher thermal contraction) while it was dominated by Kraft paper on the machine direction (lower thermal contraction). Overall, this measurement procedure could be adopted for the determination of CTE of flexible materials such as PPLP.

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“…PPLP dielectrics exhibit high AC, DC, and impulse strengths, while the dielectric loss is lower than cross-linked polyethylene (XLPE) dielectrics. PPLP has excellent electrical behavior under cryogenic temperatures, which makes it an effective option for superconducting applications 27 . PPLPs are widely used as insulation for superconducting cables and busbars.…”

mentioning

confidence: 99%

Insulation Materials and Systems for Superconducting Powertrain Devices in Future Cryo-Electrified Aircraft: Part I—Material Challenges and Specifications, and Device-Level Application

Yazdani-Asrami

Seyyedbarzegar

Zhang

et al. 2022

IEEE Electr. Insul. Mag.

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Superconducting technology for aerospace application is enabled by emerging development around hydrogen cooled electrically powered aircraft, aiming at zero-emission aviation. Superconductors, typically in the form of tape or wire in a composite architecture, can not only carry current density which is over 100 times that of copper and aluminium, but are also characterized by much lower losses. This property of superconductors makes them good candidates for the fabrication of superconducting devices of high specific power density, i.e. lower size and lighter weight, which is critical for aerospace applications. Superconductors, like any other conductors, require standard insulation to function safely and reliably in the electrical apparatus of aircraft, especially due to the special architecture, operating temperature, and operating condition of superconducting apparatus at high altitude. Extra attention should be drawn to choose proper insulating materials for such applications. In this paper, the challenges and considerations for choosing insulating materials for superconducting devices in cryo-electrified aircraft are reviewed and discussed.

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Electrical Insulation Characteristics of PPLP as a HTS DC Cable Dielectric and GFRP as Insulating Material for Terminations

Cited by 21 publications

References 8 publications

Critical Buckling Load of Thin-Walled Plastic Cylinders in Axial and Radial Loading: Overview and FEA Case Study

Critical Buckling Load of Thin-Walled Plastic Cylinders in Axial and Radial Loading: Overview and FEA Case Study

Establishment of CTE Measurement Procedure for PPLP at 77 K for HTS Power Cables using Double Extensometers

Insulation Materials and Systems for Superconducting Powertrain Devices in Future Cryo-Electrified Aircraft: Part I—Material Challenges and Specifications, and Device-Level Application

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