AP-P-19

Surface Discharge of Various Insulating Meterials and Pentration Discharge Characteristics of Electrode Materials Under High Vaccum Conditions

16:45-18:15　29/11/2023

*Junyoung Park, Woocheol Shin, Bonhyuk Ku, Hobin Lee, Yechan Kim, Garam Hahn, Seyong Choi, Seungyong Hahn, Hyoungku Kang†
1. Robinson Research Institute, Victoria University of Wellington, PO Box 33436, Lower Hutt 5012, New Zealand
Junyoung Park*, Woocheol Shin, Bonhyuk Ku, Hobin Lee, Yechan Kim, Hyoungku Kang† : Korea National University of Transportation
Garam Hahn : Pohang Accelerator Laboratory, POSTECH
Seyong Choi : Kangwon National University
Seungyong Hahn : Seoul National University
Abstract Body

In this study, the creepage discharge characteristics of Mono Cast Nylon, Glass Fiber-Reinforced Plastic (GFRP), Teflon, and PolyEther Ether Ketone (PEEK), commonly used as insulators in low-temperature systems, were analyzed under high vacuum conditions. Additionally, the influence of surface roughness on the creepage discharge characteristics of these materials was investigated. Furthermore, dielectric experiments were conducted under high vacuum conditions using various electrode materials such as copper, brass, stainless steel, and anodized aluminum to study the penetration discharge characteristics according to material type. The experimental results confirmed that the penetration breakdown characteristics are influenced by secondary electron emission from electrode materials. A functional expression was also derived to calculate the electric field intensity at spark over for the design of superconducting power facility operating under vacuum conditions. Through this study, we were able to confirm the penetration and creepage discharge characteristics of various materials in high vacuum conditions used for conduction cooling of superconducting devices, which is thought to be helpful in selecting materials when designing superconducting power facility.

References

[1] O. Lee, M. Jeong, S. Jeon, H. Lee, J. Hong and H. Kang, “Creepage Discharge Characteristics of Solid Insulation Materials for Superconducting Power Cable," in IEEE Transactions on Applied Superconductivity, Vol. 28, No. 3, pp. 1-4, 2018.

Acknowledgment

This research was supported by National R&D Program through the National Research Foundation of Korea(NRF) funded by Ministry of Science and ICT(2022M3I9A1073808).