| 论文简介 |
Abstract—A vacuum interrupter reaches its interruption limit
once high-current anode phenomena occur. In order to increase the
interrupting capability of vacuum interrupters, extensive research
work has been done which included consideration on the contact
geometry, contact material, and magnetic field in order to avoid the
formation of high-current anode phenomena. However, an opening
displacement curve characteristic of a movable contact should be
another contributor to the formation of high-current anode phenomena.
The objective of this paper is to propose an opening displacement
characteristic that is determined by high-current anode
phenomena of a vacuum interrupter. Butt-type contacts were used
in the test vacuum interrupters and the contact diameters were 12
mm and 25 mm, respectively. The contact materials were microcrystalline
CuCr25 and nanocrystalline CuCr25, respectively. Two
different opening velocities were tested which were 1.1 m/s and 2.0
m/s, respectively. In the tests, the arcing time was adjusted from
1 ms to 10 ms at each velocity. Test results showed that each type
of vacuum interrupter has its own anode discharge diagram which
is irrespective of the opening velocities. Based on each anode discharge
diagram, an opening displacement curve can be proposed in
order to avoid the regions of an intense arcmode and an anode spot
mode. With the proposed opening displacement curve, high-current
anode phenomena have less of an impact on the arcing period,
which is expected to improve the interrupting performance of the
vacuum interrupter. |
(创新港)
