Inception level of partial discharges in SF6 induced with short X-ray pulses

M. Koch, M. Bujotzek, C. M. Franck

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

7 Scopus citations

Abstract

First generation gas insulated switchgears were constructed with large safety margin. Today's trend is to reduce the size of the switchgears to save material and costs. With increased field strength due to reduced dimensions as well as increased pressure in the compartments, the influence of surface roughness, surface damages and conducting particles is increasing. Therefore the knowledge of the exact inception level of partial discharges due to those imperfections is of interest. The goal of the present contribution is to measure the discharge inception voltage in SF6 in a homogeneous field configuration with a small protrusion with unprecedented high accuracy. With a short pulse X-ray source first electrons are provided within the critical volume. The experimental results show for a 0.2 MPa SF6 insulation a threshold voltage of roughly 80 kV for positive and negative polarity at the protrusion, respectively. These inception voltages match the calculated theoretical inception level. The proposed method allows determining the inception voltage in a more efficient way as the experiment time is reduced.

Original languageEnglish
Title of host publication2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages11-14
Number of pages4
ISBN (Electronic)9781479975235
DOIs
StatePublished - 22 Dec 2014
Externally publishedYes
Event2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2014 - Des Moines, United States
Duration: 19 Oct 201422 Oct 2014

Publication series

Name2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2014

Conference

Conference2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2014
Country/TerritoryUnited States
CityDes Moines
Period19/10/1422/10/14

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