Title :
High-current vacuum arc: The relationship between anode phenomena and the average opening velocity of vacuum interrupter
Author :
Kong, Guowei ; Liu, Zhiyuan ; Wang, Dong ; Rong, Mingzhe
Author_Institution :
State Key Lab. of Electr. Insulation & Power Equip., Xi´´an Jiaotong Univ., Xi´´an, China
fDate :
Aug. 30 2010-Sept. 3 2010
Abstract :
In order to understand the influence of the average opening velocity on the high-current vacuum arc anode phenomena, a high-speed photography was used to observe anode phenomena of vacuum arc discharge in vacuum interrupters. The contact diameters used in the vacuum interrupters were 12 mm and 25 mm, respectively. The contact materials included Cu, CuCr25, and CuCr50. The arc current frequency was 50 Hz and the arcing time was controlled at about 9 ms. A permanent magnet mechanism with a contact spring was used to adjust the average opening velocity from 1.3 m/s to 1.8 m/s. The experimental results showed that with the arc current increasing, there was a threshold current I1st (peak value) with which a high-current anode mode first appeared. And the first high-current anode mode was a footpoint at the velocity of 1.8 m/s. While at the velocity of 1.3 m/s, it was most probably an anode spot and sometimes it was a footpoint. The result showed that at the velocity of 1.8 m/s, the threshold current I1st was lower than that of the 1.3 m/s. And the threshold current I1st followed the order of Cu > CuCr25 > CuCr50 at both the velocities of 1.3 m/s and 1.8 m/s. Meanwhile, at the higher average opening velocity of 1.8 m/s, the arc energy and arc voltage were higher than or close to that with 1.3 m/s.
Keywords :
anodes; arcs (electric); vacuum circuit breakers; CuCr; anode phenomena; high-current anode; high-current vacuum arc; high-speed photography; permanent magnet mechanism; vacuum interrupter; velocity 1.3 m/s; velocity 1.8 m/s; Anodes; Copper; Interrupters; Materials; Plasmas; Threshold current; Vacuum arcs;
Conference_Titel :
Discharges and Electrical Insulation in Vacuum (ISDEIV), 2010 24th International Symposium on
Conference_Location :
Braunschweig
Print_ISBN :
978-1-4244-8367-9
Electronic_ISBN :
1093-2941
DOI :
10.1109/DEIV.2010.5625830