Discharge characteristics in inhomogeneous fields under air flow

Stephan Vogel, Joachim Holbøll

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Abstract

This research investigates the impact of high velocity air flow on Partial Discharge (PD) patterns generated in strongly inhomogeneous fields. In the laboratory, a
needle plane electrode configuration was exposed to a high electrical DC-field and a laminar air flow up to 22 ms. The needle was connected to a variable DC potential of up to 100kV over a grounded plate in order to trigger different corona modes. The impact of the air flow on the space charges created in the vicinity of the electrode is evaluated by means of PD measurements in time domain. The results indicate that the wind increases the frequency and magnitude of partial discharges in the vicinity of the electrode due to an increased rate of space charge removal around the tip of the needle and in the gap. The positive polarity shows higher dependency on air flow compared to the negative polarity. It is shown that positive breakdown streamer corona can be extinguished if wind speeds of more than 14.3 ms are applied to the electrode.
Original languageEnglish
Title of host publicationProceedings of the 25th Nordic Insulation Symposium on Materials, Components and Diagnostics
Number of pages6
Publication date2017
Publication statusPublished - 2017
Event25th Nordic Insulation Symposium on Materials, Components and Diagnostics - Aros Congress Center, Västerås, Sweden
Duration: 19 Jun 201721 Jun 2017

Conference

Conference25th Nordic Insulation Symposium on Materials, Components and Diagnostics
LocationAros Congress Center
Country/TerritorySweden
CityVästerås
Period19/06/201721/06/2017

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