NDLI: Influence of no-load operation and current switching on breakdown characteristics of high voltage vacuum interrupters at contact gap 30mm

Content Provider	IEEE Xplore Digital Library
Author	Yingyao Zhang Zhiyuan Liu Yingsan Geng
Copyright Year	2012
Description	Author affiliation: State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China (Yingyao Zhang; Zhiyuan Liu; Yingsan Geng)
Abstract	It is important to understand dielectric strength of vacuum interrupters after no-load operation and current switching, which reflects a dielectric condition of the vacuum interrupters operating in field. Especially there is no such data available for high voltage vacuum interrupters with contact gaps reaching 30mm. The objective of this paper is to experimentally investigate the influence of three kinds of switching operations on the standard lightning impulse voltage breakdown characteristics of high voltage vacuum interrupters with a contact gap 30mm. The three kinds of switching operations are “closing without current / breaking without current”, “closing without current / breaking with 5kA current” and “closing without current / breaking dc current”. Therefore we designed six high-voltage vacuum interrupters with butt type contacts. The experimental results revealed that the conditioning process became slowly and the breakdown voltage followed the Weibull distribution after the three kinds of operations. And the operation “closing without current / breaking 5kA current” will increase the 50% breakdown voltage U50 of the vacuum interrupter from 340kV to 394kV. The U50 of the vacuum interrupter after the operation “closing without current / breaking without current” will increase from 340kV to 362kV. The operation “closing without current / breaking dc current” will increase the dielectric strength. As the current is increasing. The U50 increased from 385kV to 395kV with the breaking current 450A dc 500ms. And the U50 increased from 385kV to 437kV with the breaking current 750A dc 500ms.
Starting Page	60
Ending Page	63
File Size	359851
Page Count	4
File Format	PDF
ISBN	9781467312639
ISSN	10932941
e-ISBN	9781467312660
e-ISBN	9781467312653
DOI	10.1109/DEIV.2012.6412450
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-09-02
Publisher Place	Russia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Switches Interrupters Vacuum breakdown Breakdown voltage Weibull distribution
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Software

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