NDLI: The Transition from to the Metallic Phase Arc After the Rupture of the Molten Metal Bridge for Contacts Opening in Air and Vacuum

Content Provider	IEEE Xplore Digital Library
Author	Slade, P.G.
Copyright Year	2008
Abstract	The total arcing time between opening electrical contacts interrupting a low voltage, low current circuit in both air and vacuum was controlled. The voltage across the opening contacts showed the rupture of the molten metal bridge and then its rapid increase to a value greater than the minimum arcing voltage before dropping back to a value close to the minimum arcing voltage. Using a radioactive tracer technique it was observed that at very short arcing times there was an anomalous net transfer of contact material to the cathode. As the arcing time increased this cathode gain decreased before increasing again at longer arcing times. High-speed streak photographs of contacts opening in air at higher currents showed an initial shock wave that resulted from the rupture of the molten metal bridge and before the formation of the metallic phase arc. Similar photographs of contacts opening in vacuum showed the initiation of a metal phase arc in the region of the ruptured molten metal bridge. After the rupture of the molten metal bridge, the voltage across the contacts rose very rapidly to a value of a few 10's of volts before dropping back to a minimum value. These data will be used to discuss the rupture of the molten metal bridge, the formation of the pseudo arc in the high-pressure metal vapor resulting from the bridge rupture and the eventual development of the metallic phase arc.
Starting Page	1
Ending Page	8
File Size	825934
Page Count	8
File Format	PDF
ISBN	9781424419012
DOI	10.1109/HOLM.2008.ECP.14
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-27
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Vacuum arcs Bridge circuits Contacts Cathodes Low voltage Voltage control Radioactive materials Photography Time measurement Inductance
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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