Title :
Non-Uniform Field Breakdown and Surface Flashover in Liquid Nitrogen Gaps for HTS Applications
Author :
James, D.R. ; Sauers, I. ; Tuncer, E. ; Ellis, A.R. ; Tekletsadik, K. ; Hazelton, D.W.
Author_Institution :
Oak Ridge Nat. Lab., TN
Abstract :
Liquid nitrogen (LN2) is used as a coolant and electrical insulation in many High Temperature Superconducting (HTS) applications. Hence a good understanding of the breakdown characteristics of this medium under a variety of practical electrode geometries and conditions is needed for design of high voltage equipment. While there is considerable literature on breakdown of LN2 gaps for uniform (plane-plane) or quasi-uniform electric fields (sphere-plane), there is much less data available for highly non-uniform field gaps and for surface flashover along insulators. In this paper we present results on sphere-plane and cylindrical rod-plane gaps in LN2 as a function of sphere and rod diameters and radius of the rod edge at 1 bar pressure. In addition the surface flashover voltages of Fiber-Reinforced Plastic (FRP) in LN2 with these electrode arrangements will also be reported
Keywords :
coolants; electric breakdown; flashover; high-temperature superconductors; nitrogen; superconducting devices; 1 bar; HTS applications; coolant; cylindrical rod-plane gaps; electrical insulation; electrode geometries; fiber-reinforced plastic; high temperature superconductor; high voltage equipment; liquid nitrogen gaps; nonuniform field breakdown; quasiuniform electric fields; sphere-plane gaps; surface flashover; Breakdown voltage; Coolants; Dielectric liquids; Dielectrics and electrical insulation; Electric breakdown; Electrodes; Fiber reinforced plastics; Flashover; High temperature superconductors; Nitrogen;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 2006 IEEE Conference on
Conference_Location :
Kansas City, MO
Print_ISBN :
1-4244-0547-5
Electronic_ISBN :
1-4244-0547-5
DOI :
10.1109/CEIDP.2006.312028
