Title :
Electrical breakdown triggered by free conducting spherical particle in saturated liquid HeI and HeII under uniform DC field
Author :
Hara, Hara M. ; Nakagawa, Nakagawa H. ; Suehiro, Suehiro J. ; Shinohara, Shinohara T.
Author_Institution :
Dept. of Electr. & Electron. Syst. Eng., Kyushu Univ., Fukuoka, Japan
Abstract :
Pre-breakdown phenomena and breakdown characteristics in the presence of a free conducting spherical particle in saturated normal liquid helium (HeI) and saturated superfluid liquid helium (HeII) under uniform dc field are studied experimentally. The results show that microdischarge occurs between the electrode and approaching oppositely charged particle and a bubble generates at the moment of particle collision with the electrode both in HeI and in HeII. The clear discontinuity in the characteristics of breakdown voltage vs. pressure at the λ-point is found.
Keywords :
bubbles; discharges (electric); electric breakdown; liquid helium-4; superfluid helium-4; He; He II; breakdown voltage; bubble; discontinuity; electrical breakdown; electrode; free conducting spherical particle; microdischarge; particle collision; pre-breakdown phenomena; saturated liquid He I; saturated normal liquid helium; saturated superfluid liquid helium; uniform DC field; Dielectric liquids; Electric breakdown; Electrodes; Helium; Insulation; Superconducting coils; Systems engineering and theory; Temperature measurement; Testing; Voltage;
Conference_Titel :
Dielectric Liquids, 2002. ICDL 2002. Proceedings of 2002 IEEE 14th International Conference on
Print_ISBN :
0-7803-7350-2
DOI :
10.1109/ICDL.2002.1022703
