Influence of Initial Opening Speed on Characteristics of a Drawn Vacuum Arc.pdfVIP

Influence of Initial Opening Speed on Characteristics of a Drawn Vacuum Arc.pdf

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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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