AC Current Interruption by Liquid Nitrogen in a Superconducting Fault Current Limiting Switchgear

Bin Xiang, Hongxu Li, Lei Gao, Yingsan Geng, Zhiyuan Liu, Jianhua Wang, Xiaoze Pei, Youping Tu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A new switchgear named Liquid Nitrogen Insulated metal-enclosed Switchgear (LNIS) is proposed, which uses LN2 as an insulation medium to substitute SF6in Gas Insulated metal-enclosed Switchgears (GIS). Power loss of the LNIS is only about 1/8 of the same level GIS, making the novel switchgear a fascinating technology for future power systems. To make the switchgear more compact and efficient, LN2 is also used as an arc extinguishing medium of disconnecting switches. Thus, closed-loop current that can up to thousands of amps should be interrupted by LN2. However, AC current interruption ability of LN2 is still unknown. The objective of this paper is to obtain the AC current interruption properties of LN2. Experiments are conducted with currents ranging from 700 A to 4 kA. AC current of 2950 A (Peak value) is interrupted by LN2 successfully. The maximum arc energy during the interruption is about 437 J, far less than the Joul heat generated by the rated current flow. Arc energy during interruption doesn't burn extra burden on the cooling system. Thus, AC current interruption ability of LN2could meet requirements for LNIS.

Original languageEnglish
Title of host publication2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2020
Place of PublicationU. S. A.
PublisherIEEE
ISBN (Electronic)9781728152158
DOIs
Publication statusPublished - 16 Oct 2020
Event2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2020 - Virtual, Tianjin, China
Duration: 16 Oct 202018 Oct 2020

Publication series

Name2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2020

Conference

Conference2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2020
CountryChina
CityVirtual, Tianjin
Period16/10/2018/10/20

Keywords

  • AC current interruption
  • arc energy
  • Liquid Nitrogen Insulated metal-enclosed Switchgear (LNIS)
  • LN2 switch

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Electronic, Optical and Magnetic Materials

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