Electrical insulation characteristics of cold dielectric high temperature superconducting cable

Suzuki, H.; Takahashi, Toshihiro; Okamoto, Tatsuki; Akita, S.; Ozawa, Yasuo

doi:10.1109/tdei.2002.1115489

Cited by 30 publications

(4 citation statements)

References 4 publications

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“…operation within a liquid nitrogen environment. PPLP is now extensively used as a cold dielectric in the composite insulation systems used for high-temperature superconducting (HTS) cables [15][16][17]. In this case, micro-voids existing within the laminate paper insulation are filled with nitrogen, thus reducing the overall dielectric constant of the PPLP structure.…”

Section: Introductionmentioning

confidence: 99%

Low-κ′ dielectric properties of UV-treated bi-axially oriented polypropylene films

Dervos¹,

Tarantili²,

Athanassopoulou³

2009

J. Phys. D: Appl. Phys.

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A 40 µm multilayer bi-axially oriented polypropylene (BOPP) film, was fabricated by the tenter process and its dielectric response was investigated after applying combined action of UV, humidity and heat. Dissipation factor (tan δ) and relative dielectric constant measurements were performed via the capacitance method for frequencies 20Hz–1 GHz. These results show that the relative dielectric constant (κ′) reduces towards ultra low values (1.8) with an increasing number of applied UV–condensation cycles without any subsequent increase in the dielectric loss. Having no added physical porosity and absence of fluorine atoms, the irradiated BOPP structures offer significant advantages over poly(tetrafluoroethylene) PTFE due to reduced polarization effects, lower dielectric constant values and chemical stability to the adjacent copper or aluminium conductors. Possible application fields are dry type high-voltage capacitors and insulation within electronic components.

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Section: Introductionmentioning

confidence: 99%

Low-κ′ dielectric properties of UV-treated bi-axially oriented polypropylene films

Dervos¹,

Tarantili²,

Athanassopoulou³

2009

J. Phys. D: Appl. Phys.

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“…There are, technically, two types of superconducting cables from a dielectric viewpoint, i.e. warm and cold dielectrics 53 . Unlike the warm dielectric design proposed in traditional cables, the superconducting cable design often adopts cold insulation because it has good thermal compatibility at cryogenic environment.…”

Section: Iva Superconducting Cablementioning

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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“…Generally, it is assumed that chemical degradation in HTS cable is of minor importance because of the cryogenic temperature [11]. Still, if relevant, remaining life (and  relate to an activation energy ΔH [12]:…”

Section: Accelerated Ageing In Testingmentioning

confidence: 99%

Insulation reliability of superconductive cables

Ross

Gholizad

Koopmans

et al. 2017

2017 1st International Conference on Electrical Materials and Power Equipment (ICEMPE)

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Abstract-High current capability, good integration in urban area and zero external magnetic field are advantages of HTS cables that make them interesting for implementation in the Netherlands. So far experience with HTS cable projects is good, but still limited. Yet there is a need for a proper testing practice. Due to limited operational experience, various aspects remain to be studied. This paper focuses on electrical testing of electrical insulation, the application of power laws and the length effect. These issues are yet to be resolved, but the paper discusses their background and uncertainties. This may give direction to the ongoing studies in order to assure quality of HTS.

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Electrical insulation characteristics of cold dielectric high temperature superconducting cable

Cited by 30 publications

References 4 publications

Low-κ′ dielectric properties of UV-treated bi-axially oriented polypropylene films

Low-κ′ dielectric properties of UV-treated bi-axially oriented polypropylene films

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

Insulation reliability of superconductive cables

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