Polarity effect on standard lightning impulse in LN2/insulation barrier composite systems

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

Research output: Contribution to journalArticlepeer-review

1 Citation (SciVal)

Abstract

Impulse breakdown voltage is one of the most important factors for the designation of the R-SFCLs. However, no research about the polarity effect on standard lightning impulse in LN2/insulation barrier composite systems has been reported. The objective of this paper is to study the polarity effect on the standard lightning impulse in the LN2/insulation barrier composite systems. The 50% impulse breakdown voltage was measured with a pair of the needle to plane electrodes with the 0.05 mm thick PTFE film. The gap length of the two electrodes was 10 mm. The distance between the needle electrode and the insulation barrier was varied. The time delays during the breakdown progress were recorded by the oscilloscope. The breakdown path was determined by the arc traces on the PTFE films. The results showed that the 50% impulse breakdown voltage of the LN2/insulation barrier composite increased with the insulation barrier get closer to the needle electrode. The results of the time delays reflect that in negative polarity, all the breakdowns occurred in the tail of the waveform. In positive polarity, most of the breakdowns occurred in the head of the waveform. With the barrier get closer to the insulation barrier, the longer time delay Tdelay was in both polarities. And the probability of wave tail breakdown increased in positive polarities. The arc traces on the PTFE showed that all the breakdowns were occurred through the PTFE film.

Original languageEnglish
Article number9496208
JournalIEEE Transactions on Applied Superconductivity
Volume31
Issue number8
DOIs
Publication statusPublished - 26 Jul 2021

Bibliographical note

Funding Information:
Manuscript received February 24, 2021; revised April 4, 2021; accepted April 22, 2021. Date of publication July 26, 2021; date of current version August 18, 2021. This work was supported in part by the National Natural Science Foundation of China under Grants 51907153 and 51877166, in part by the General Project of Key R&D Plan in Shaanxi Province Industrial Field under Grant 2021GY-119, and in part by the State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources under Grant LAPS20008. (Corresponding author: Bin Xiang.) The authors are with the State Key Laboratory of Electrical Insulation and Power Equipment, Department of Electrical Engineering, Xi’an Jiaotong Univerist-y, Xi’an 710049, China, with the Department of Electronic & Electrical Engineering, The University of Bath Bath, BA2 7AY, U.K., and also with the State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, China (e-mail: anthonylei@yeah.net; xiangbin1021@xjtu.edu.cn; 2984445644@qq.com; typ@ncepu.edu.cn; lihongxu@stu.xjtu.edu.cn; liuzy@mail.xjtu.edu.cn; ysgeng@mail.xjtu.edu.cn; jhwang@mail.xjtu.edu.cn; x.pei@bath.ac.uk).

Publisher Copyright:
© 2002-2011 IEEE.

Keywords

  • Barrier effect
  • Breakdown time delays
  • Impulse breakdown
  • LN2
  • Polarity effect

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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