V-t characteristics of partial discharge inception in liquid nitrogen/PPLP® composite insulation system for HTS cable

H. Okubo*, M. Hazeyama, N. Hayakawa, S. Honjo, T. Masuda

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

In this paper, we studied partial discharge (PD) inception characteristics and V-t characteristics of PD inception in liquid nitrogen (LN2)/polypropylene laminated paper (PPLP®) composite insulation system for high temperature superconducting (HTS) cable. Experimental results revealed that the magnitude of initial PD was in the range of 2.0-30 pC irrespective of butt gap condition and the initial PD was generated at the first and third quadrant of voltage phase. PD inception electric field strength (PDIE) without butt gap was 5-10% higher than that with butt gap and thicker butt gap gave larger PDIE drop. Moreover, PDIE with butt gap depended on the butt gap thickness and the number of PPLP® layers. The reason is explained by the existing probability of weak points of electrical insulation at butt gap. Finally, lifetime indices n of V-t characteristics at PD inception were obtained as 80-100 irrespective of butt gap condition. These values showed enough flat characteristics of V-t phenomena of electrical insulation.

Original languageEnglish
Pages (from-to)945-951
Number of pages7
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Volume9
Issue number6
DOIs
Publication statusPublished - 2002 Dec
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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