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Influence of Initial Opening Speed on Characteristics of a Drawn Vacuum Arc.pdf
PlasmaScienceandTechnology,Vo1.13,No.3,Jun.2011
InfluenceofInitialOpening Speed on CharacteristicsofaDrawn
cuum Arc
XIUShixin(修十新),YEZhaoping(叶兆 ),LIQuan(李泉)
StateKeyLab ofElectricalInsulation and PowerEquipment,Xi’an JiaotongUniversity
Xi’an 710049,China
A bstract Influenceoftheinitialopeningspeedonthecharacteristicsofdrawnvacuum arcs
foraxialmagneticfield(AMF)vacuum interrupters(VIs)isstudiedusingahigh—speedcharge—
coupleddevicefCCD1camera.Twovaluesofinitialopeningspeed,0.5m/sand1.5m/swereset
tomakeacomparativestudy.Thecup—typeelectrodewasmadeofCu—Crf50%一50% inweight)
with a diameterof30mm and a gap distancebetween electrodesof10mm .Theresultsshow
t11atthetransitiontimedecreasesby0.5mswhentheinitialopeningspeedincreasesfrom0.5rn/s
to1.5m/satapeakcurrentof2.5kA.whilethetransitiontimedecreasesby1.0InSwhenthe
initialopeningspeedincreasesfrom 0.5m/sto1.5m/satapeakcurrentof5.0kA.Thereason
why thedurationofthetransition arcmodedecreasesisthatthee凸 ctofelectromagneticf0rce
and Coulombofrceamongarcsisincreasedwhentheinitialopeningspeedincreases.
Keywords:openingvelocity,vacuum arc,AMF
PACS:52.50.Q
1 Introduction namely a. there isaregion ofconcentrated cathode
spots,sim ilartothetransitionmodeofrbuttcontacts
Even thefirstSUCCESSfulapplicationofvacuum cir— atlowercurrentswithoutAMF:b.overafew millisec—
cuitbreakersbegan in them id一1950s.continuousde— onds.anincreasingnumberofindividualcathodespots
velopm entofvacuuIn interruptersandvacuum circuit begintoappearoutsidetheconcentrated region,until
breakersworldwide hasled to awiderrangeofnew
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