電弧兩相轉(zhuǎn)變規(guī)律和機(jī)理的理論與實(shí)驗(yàn)研究.pdf

1、華中科技大學(xué)碩士學(xué)位論文電弧兩相轉(zhuǎn)變規(guī)律和機(jī)理的理論與實(shí)驗(yàn)研究姓名：周瑋申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：高電壓與絕緣技術(shù)指導(dǎo)教師：何俊佳20070227華中科技大學(xué)碩士學(xué)位論文IIABSTRACTRelayasoneofmainelectroniccomponentsfcontrolinfmationtransfercircuitswitchiswidelyusedinthefieldofaerospaceaviation.Nowhavingb

2、igcapacitancehighreliabilityarethemaincurrentinthedesignofrelaycontactoneoftheimptantcomponentsofrelayisverysimplebutitsfaultasaresultofthearcthatiscomingintobeingwhenthecontactsareclosingopeningisveryserious.SoItisofver

3、ytheeticsignificancepracticalitywthtoinvestigateonthemechanismofhowbreakingarcgeneratesdevelopontheacteristicofittosufficefkeepingupthelifethereliabilitywiththeimprovementontheopencapacitance.Thediscussiononthearcburning

4、mechanismisnecessaryftheresearchoncontacts’arccrosion.Butbecauseofthelowvoltagelowcurrentthearccannotlastlongduration.Ithasremarkablenearingcathodespaceeffectthetransfmationfrommetallicphasetogaseousphase.Ithasveryimptan

5、tsignificanttoresearchthemechanismoftwophasetransition.ThispaperwhichisbasedontheloadexperimentsemphasizesontheChangerulesofarcacters:arctimePlatfms’voltagediscussesthemechanismoftwophasetransition.Firsttheexperimentalci

6、rcuitplanweredesigned.Theloadexperimentswerecarriedoninairconditionunder36Vvoltage.Thenthewavefmswereusedtodefinitethetwoarcstagesthetheiracteristicparameters:eacharctimevoltagevaluesofarcplatfms.Carryingonthetwoacterist

7、icparameterstherelationshipswereObtainedfromtotalarctimemetallicarctimegaseousarctimeinitialvoltageaveragevoltageoneachphasetocurrent.Theexperimentsindicatethat:totalarctimeincreaseswithcurrentbythreestageseachstateprese

8、ntsfgoodlinearrelationmetallicarctimeincreaseswithcurrentbyIndexrelationithasthesaturatedtendencybigdispersivitytotalarctimehadlargegrowthwhengaseousphasearcappearancesgaseousarctimehassmallerdispersivitymetallicphasearc