DocumentCode :
986417
Title :
Arc voltage of a fast triggered vacuum gap
Author :
Delmas, Antoine ; Lequitte, Pascal
Author_Institution :
Lab. d´´Electrotech., Univ. de Paris VI et XI, Orsay, France
Volume :
21
Issue :
5
fYear :
1993
fDate :
10/1/1993 12:00:00 AM
Firstpage :
501
Lastpage :
505
Abstract :
At high current, the performance of triggered vacuum gaps (TVGs) is limited by constriction of the vacuum arc. Several concentrated modes can be defined, i.e., foot point, anode spot, and intense arc mode. In all cases, small, luminous, high-temperature spots (from melting to boiling temperature) appear on the anode surface. In accordance with the anodic mode, the arc voltage has different characteristics (quiet and low or with high-frequency noise). The arc voltage is measured for different electrode configurations for a conduction time of 27 μs and for peak current up to 45 kA. For small gap distances (1-1.5 mm), the arc voltage is quiet and low (20 to 30 V) and almost independent of the peak current. For greater distances, the arc voltage increases with the distance and the peak current. If the peak current is higher than the threshold interruption current, the arc voltage is high and noisy. These overvoltages, with a frequency of about one megahertz, can reach more than 1000 V. These overvoltages disappear completely after about 15 μs, and the voltage decreases
Keywords :
circuit-breaking arcs; vacuum insulation; 15 mus; 20 to 30 V; 27 mus; 45 kA; anode spot; anode surface; arc voltage; boiling temperature; fast triggered vacuum gap; foot point; high-temperature spots; intense arc mode; melting; overvoltages; peak current; threshold interruption current; vacuum arc; Anodes; Current measurement; Electrodes; Foot; Surges; Temperature; Threshold voltage; Time measurement; Vacuum arcs; Voltage measurement;
fLanguage :
English
Journal_Title :
Plasma Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0093-3813
Type :
jour
DOI :
10.1109/27.249634
Filename :
249634
Link To Document :
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