| 论文简介 |
Abstract—In order to understand the influence of the average
opening velocity on the high-current vacuum arc anode phenomena,
high-speed photography was used to observe the anode phenomena
of the vacuum arc discharge in vacuum interrupters. The
contact diameters used in the vacuum interrupters were 12 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 to 1.8 m/s. The experimental results showed that,
with the arc current increasing, there was a threshold current I1st
(peak value) at which a high-current anode mode first appeared.
Moreover, 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 at 1.3 m/s. Moreover, 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 those at 1.3 m/s. |
(创新港)
