Electrical properties of commercial sheet insulation materials for cryogenic applications

Conference Paper · November 2008with13 Reads
DOI: 10.1109/CEIDP.2008.4772931 · Source: IEEE Xplore
Conference: Electrical Insulation and Dielectric Phenomena, 2008. CEIDP 2008. Annual Report Conference on
Dielectric properties of electrical insulation materials are needed for low temperature power applications. Performance of materials and their compatibility determine the size of the electrical insulation in power equipment. In this work we report the dielectric properties of some commercially available materials in sheet form. The selected materials are polypropylene laminated paper from Sumitomo Electric Inc., porous polyethylene (Tyvektrade) from Dupont and polyamide paper (Nomextrade) from Dupont. The dielectric properties are characterized with an electrical impedance analyzer in the frequency domain. The impedances are recorded in a cryocooler in the temperature range from 50 K to 300 K. The dielectric breakdown characteristics of the materials are measured in a liquid nitrogen bath at atmospheric pressure.
    • "The composition of a polymeric material can be varied in many ways, through the addition of antioxidant, plasticizers, crosslinkers, fillers, etc. The addition of inorganic filler to an elastomer will increase its stiffness, albeit at the expense of reduced elongation at break [10], [11], [12], [13] and [14] . As of now, work is underway to examine the physical properties of nanocomposite materials composed of nanoparticles and their compounds stabilized within a polymeric dielectric matrix. "
    [Show abstract] [Hide abstract] ABSTRACT: The importance of nanoparticles in controlling physical properties of polymeric nanocomposite materials leads us to study effects of these nanoparticles on electric and dielectric properties of polymers in industry In this research, the dielectric behaviour of High- Density Polyethylene (HDPE) nanocomposites materials that filled with nanoparticles of clay or fumed silica has been investigated at various frequencies (10 Hz– 1 kHz) and temperatures (20–60 �C). Dielectric spectroscopy has been used to characterize ionic conduction, then, the effects of nanoparticles concentration on the dielectric losses and capacitive charge of the new nanocomposites can be stated. Capacitive charge and loss tangent in high density polyethylene nanocomposites are measured by dielectric spectroscopy. Different dielectric behaviour has been observed depending on type and concentration of nanoparticles under variant thermal conditions.
    Full-text · Article · Sep 2016 · IEEE Transactions on Applied Superconductivity
    • "However, paper can still be used in HTS transformers [6]. Other paper derivatives were also fabricated and used in HTS applications [7], [8]. In the current study we present the dielectric properties of Kraft paper and present how one can improve the properties by modifying the paper. "
    [Show abstract] [Hide abstract] ABSTRACT: Paper is widely used in various engineering applications due to its physical properties and ease of manufacture. As a result paper has been selected or designed as an electrical insulation material for parts and components in high voltage technology. In the current study we select a paper employed in conventional transformers as the electrical insulation material. The potential of this paper is investigated at cryogenic temperatures to determine its physical properties for high temperature superconducting power applications. Dielectric measurements were performed using impedance spectroscopy at a constant frequency. Dielectric breakdown tests were performed on samples at 77 K using a liquid nitrogen bath.
    Full-text · Article · Jul 2011