Experimental study on the lightning impulse dielectric strength of liquid nitrogen insulation medium according to various pressures

J. B. Na; H. Kang; K. S. Chang; Y. J. Kim; S. Y. Chu; T. J. Kim; K. J. Kim; H. G. Lee; T. K. Ko

doi:10.1016/j.physc.2011.05.242

Experimental study on the lightning impulse dielectric strength of liquid nitrogen insulation medium according to various pressures

J. B. Na, H. Kang, K. S. Chang, Y. J. Kim, S. Y. Chu, T. J. Kim, K. J. Kim, H. G. Lee, T. K. Ko

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The lightning impulse breakdown characteristics of liquid nitrogen are necessarily considered for designing high voltage superconducting machines required high reliability. This paper investigates the dielectric capability of liquid nitrogen (LN₂) to withstand lightning impulse. To gain the dielectric capability of LN₂ cryogenic cooling system, lightning impulse was induced in sphere-plane electrode systems which have six different diameters of sphere electrode. The pressure is one of major condition to decide dielectric strength at LN₂ cryogenic cooling system. Thus, the gaseous nitrogen was injected to control pressure in the cryostat, ranging from 100 kPa to 200 kPa. Moreover, field utilization factor was calculated between sphere and plane electrode systems by a finite element method analysis. The electric field criterion of LN₂ as insulation media was calculated from correlation between the experimental results and the field utilization factor. In the future, these results can be applied as the design parameter of electrical insulation for developing high voltage superconducting machines.

Original language	English
Pages (from-to)	1581-1585
Number of pages	5
Journal	Physica C: Superconductivity and its Applications
Volume	471
Issue number	21-22
DOIs	https://doi.org/10.1016/j.physc.2011.05.242
Publication status	Published - 2011 Nov

Bibliographical note

Funding Information:
This research was supported by National R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (No. 2009-0082742).

Keywords

Electrical insulation for high voltage superconducting machines
Field utilization factor
Lightning impulse dielectric experiment
Liquid nitrogen insulation media
Sphere and plane electrode systems

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/j.physc.2011.05.242

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title = "Experimental study on the lightning impulse dielectric strength of liquid nitrogen insulation medium according to various pressures",

abstract = "The lightning impulse breakdown characteristics of liquid nitrogen are necessarily considered for designing high voltage superconducting machines required high reliability. This paper investigates the dielectric capability of liquid nitrogen (LN2) to withstand lightning impulse. To gain the dielectric capability of LN2 cryogenic cooling system, lightning impulse was induced in sphere-plane electrode systems which have six different diameters of sphere electrode. The pressure is one of major condition to decide dielectric strength at LN2 cryogenic cooling system. Thus, the gaseous nitrogen was injected to control pressure in the cryostat, ranging from 100 kPa to 200 kPa. Moreover, field utilization factor was calculated between sphere and plane electrode systems by a finite element method analysis. The electric field criterion of LN2 as insulation media was calculated from correlation between the experimental results and the field utilization factor. In the future, these results can be applied as the design parameter of electrical insulation for developing high voltage superconducting machines.",

keywords = "Electrical insulation for high voltage superconducting machines, Field utilization factor, Lightning impulse dielectric experiment, Liquid nitrogen insulation media, Sphere and plane electrode systems",

author = "Na, {J. B.} and H. Kang and Chang, {K. S.} and Kim, {Y. J.} and Chu, {S. Y.} and Kim, {T. J.} and Kim, {K. J.} and Lee, {H. G.} and Ko, {T. K.}",

note = "Funding Information: This research was supported by National R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (No. 2009-0082742).",

year = "2011",

month = nov,

doi = "10.1016/j.physc.2011.05.242",

language = "English",

volume = "471",

pages = "1581--1585",

journal = "Physica C: Superconductivity and its Applications",

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T1 - Experimental study on the lightning impulse dielectric strength of liquid nitrogen insulation medium according to various pressures

AU - Na, J. B.

AU - Kang, H.

AU - Chang, K. S.

AU - Kim, Y. J.

AU - Chu, S. Y.

AU - Kim, T. J.

AU - Kim, K. J.

AU - Lee, H. G.

AU - Ko, T. K.

N1 - Funding Information: This research was supported by National R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (No. 2009-0082742).

PY - 2011/11

Y1 - 2011/11

N2 - The lightning impulse breakdown characteristics of liquid nitrogen are necessarily considered for designing high voltage superconducting machines required high reliability. This paper investigates the dielectric capability of liquid nitrogen (LN2) to withstand lightning impulse. To gain the dielectric capability of LN2 cryogenic cooling system, lightning impulse was induced in sphere-plane electrode systems which have six different diameters of sphere electrode. The pressure is one of major condition to decide dielectric strength at LN2 cryogenic cooling system. Thus, the gaseous nitrogen was injected to control pressure in the cryostat, ranging from 100 kPa to 200 kPa. Moreover, field utilization factor was calculated between sphere and plane electrode systems by a finite element method analysis. The electric field criterion of LN2 as insulation media was calculated from correlation between the experimental results and the field utilization factor. In the future, these results can be applied as the design parameter of electrical insulation for developing high voltage superconducting machines.

AB - The lightning impulse breakdown characteristics of liquid nitrogen are necessarily considered for designing high voltage superconducting machines required high reliability. This paper investigates the dielectric capability of liquid nitrogen (LN2) to withstand lightning impulse. To gain the dielectric capability of LN2 cryogenic cooling system, lightning impulse was induced in sphere-plane electrode systems which have six different diameters of sphere electrode. The pressure is one of major condition to decide dielectric strength at LN2 cryogenic cooling system. Thus, the gaseous nitrogen was injected to control pressure in the cryostat, ranging from 100 kPa to 200 kPa. Moreover, field utilization factor was calculated between sphere and plane electrode systems by a finite element method analysis. The electric field criterion of LN2 as insulation media was calculated from correlation between the experimental results and the field utilization factor. In the future, these results can be applied as the design parameter of electrical insulation for developing high voltage superconducting machines.

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KW - Field utilization factor

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Experimental study on the lightning impulse dielectric strength of liquid nitrogen insulation medium according to various pressures

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Bibliographical note

Keywords

ASJC Scopus subject areas

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