DC breakdown voltage characteristics of saturated liquid helium in the presence of metallic particles

Masanori Hara, Yuji Maeda, Nobutaka Nakagawa, Junya Suehiro, Shuichi Yamada

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

This paper deals with the breakdown voltage characteristics of saturated liquid helium in the presence of a needle-shaped or spherical metallic particle to obtain insulation design data for pool-cooled, low-temperature superconducting coils and to find the predominant factor affecting the breakdown voltage of liquid helium at a given state. The results show the following. (1) The generation of bubbles at the instant of collision of a particle with an electrode is caused mainly by the kinetic energy released from the moving particle to the liquid helium, while the electrostatic energy accompanying the microdischarge between the particle and the electrode has a lesser effect on it. (2) The lowest breakdown voltage at different particle conditions appears in the case of a free needle particle. The low breakdown voltage is caused by the bubble triggered by the particle collision, the high electric field at the tip of the needle particle, and the rich initial electrons supplied by the microdischarge.

Original languageEnglish
Article number1657957
Pages (from-to)470-476
Number of pages7
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Volume13
Issue number3
DOIs
Publication statusPublished - Jun 1 2006

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Electric breakdown
Helium
Needles
Liquids
Electrodes
Kinetic energy
Insulation
Electrostatics
Electric fields
Electrons
Temperature

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

DC breakdown voltage characteristics of saturated liquid helium in the presence of metallic particles. / Hara, Masanori; Maeda, Yuji; Nakagawa, Nobutaka; Suehiro, Junya; Yamada, Shuichi.

In: IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 13, No. 3, 1657957, 01.06.2006, p. 470-476.

Research output: Contribution to journalArticle

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