Improvement of dielectric performance of solid/gas composite insulation with YSZ/ZTA coatings View Full Text


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Article Info

DATE

2019-12

AUTHORS

Zhu Sun, Weiwei Fan, Zhiyuan Liu, Yu Bai, Yingsan Geng, Jianhua Wang

ABSTRACT

N2 has been introduced to gas-insulated switchgears (GIS) as an environmentally friendly insulation medium for SF6 gas. Considering the low breakdown strength of N2, it's essential to apply a dielectric coating on part of the electrode in GIS. In the current work, yttria-stabilized zirconia (YSZ) and zirconia-toughened alumina (ZTA) ceramics are tactfully applied as dielectric coating materials and successfully coated on the surface of rod electrode via high efficiency supersonic atmospheric plasma spraying method. It is demonstrated that both YSZ and ZTA have excellent thermal stability. In the measured frequency range 10-2-106 Hz, the dielectric constant (ε') decreases with the increase in frequency. At measured temperatures (0-140 °C), ε' increases from 15.45 to 16.31 for YSZ ceramic at 1 kHz, while it varies between 30.23 and 39.34 for ZTA ceramic. As compared to that of bare electrode, the 50% BDV (U50) of solid/gas composite insulation system is significantly improved when using YSZ and ZTA as coating materials. Furthermore, the U50 increases with the increase of coating thickness. For the electrode coated with ZTA ceramic (500 μm), the U50 value reaches to 86 kV, which is enhanced about 21.13% in comparison with that of bare electrode. With respect to YSZ ceramic coating (500 μm), a higher U50 value of 88 kV is obtained. This is mainly due to that YSZ has a lower permittivity, which can generate a more uniform electric field distribution between the rod and plane electrodes, bringing about a higher breakdown voltage. More... »

PAGES

3888

References to SciGraph publications

  • 1987-02. Microstructure of Y-PSZ after ageing at high temperature in JOURNAL OF MATERIALS SCIENCE
  • 1989-10. Zirconia-toughened alumina (ZTA) ceramics in JOURNAL OF MATERIALS SCIENCE
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1038/s41598-019-40515-8

    DOI

    http://dx.doi.org/10.1038/s41598-019-40515-8

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1112603637

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/30846774


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