Very low frequency breakdown strengths of electrical insulation materials at cryogenic temperatures

I. Sauers, E. Tuncer, G. Polizos, D. R. James, A. R. Ellis, M. O. Pace

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

For long cables or equipment with large capacitance it is not always possible to conduct high voltage withstand tests at 60 Hz due to limitations in charging currents of the power supply. Very low frequency (typically at a frequency of 0.1 Hz) has been used for conventional cables as a way of getting around the charging current limitation. For superconducting grid applications the same issues apply. However there is very little data at cryogenic temperatures on how materials perform at low frequency compared to 60 Hz and whether higher voltages should be applied when performing a high voltage acceptability test. Various materials including G10 (fiberglass reinforced plastic or FRP), kapton (commonly used polyimide), polycarbonate, and polyetherimide, and in liquid nitrogen alone have been tested using a step method for frequencies of 60 Hz, 0.1 Hz, and dc. The dwell time at each step was chosen so that the voltage stress time would be the same in both the 60 Hz and 0.1 Hz tests. The data indicated that, while there is a small frequency dependence for liquid nitrogen, there are significant differences for the solid materials studied.

Original languageEnglish
Title of host publicationCEIDP - 2009 Annual Report Conference on Electrical Insulation and Dielectric Phenomena
Pages315-318
Number of pages4
DOIs
StatePublished - 2009
Event2009 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP - Virginia Beach, VA, United States
Duration: Oct 18 2009Oct 21 2009

Publication series

NameAnnual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
ISSN (Print)0084-9162

Conference

Conference2009 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
Country/TerritoryUnited States
CityVirginia Beach, VA
Period10/18/0910/21/09

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