junior maintenance electrician q a(维修电工初级问答)

junior maintenance electrician q a(维修电工初级问答)

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时间:2018-07-15

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1、JuniormaintenanceelectricianQ&A(维修电工初级问答)1.whyisthelowvoltagewindingofthetransformerinitandthehighvoltagewindingoutside?Answer:thearrangementofhighandlowvoltagewindingsoftransformersisdeterminedbymanyfactors.Butformosttransformers,thelowvoltagewindingisarrangedi

2、nsidethehighvoltagewinding.Thisismainlyconcernedwithinsulation.Theoretically,nomatterhowhighvoltagewindingorlowvoltagewindingisarranged,itcanchangepressure.Butbecausethecoreofthetransformerisgrounded,thelowvoltagewindingisclosetothecore,soitiseasytodofromtheinsu

3、lationangle.Ifthehighvoltagewindingclosetothecore,thehighvoltagewindingvoltage,tomeettheinsulationrequirements,itrequiresalotofinsulationmaterialsandalargerinsulationdistance.Inthisway,notonlythevolumeofthewindingisincreased,butalsotheinsulationmaterialiswasted.

4、Dailyelectriccommunity,http://www.electric365.cnInaddition,becausethevoltageadjustmentofthetransformerisrealizedbychangingthetapofthehigh-voltagewinding,namelychangingthenumberofturns,thehigh-voltagewindingisarrangedoutsidethelow-voltagewindingandtheleadiseasy.2

5、.,three-phaseasynchronousmotorishowtoturnup?Answer:whenthethree-phasealternatingcurrentthroughthethree-phasestatorwinding,willproducearotatingmagneticconstantrotationbeforethestationaryrotorconductorinarotatingmagneticfieldinthestatorcavity,theequivalentoftherot

6、orrelativetotheconductorcuttingmagneticfieldlines,resultingintheinductioncurrentintherotorconductor(electromagneticinductionprinciple).Theseinduction-induceddeadconductorsmoveinthefield(theeffectofelectriccurrent-electromagneticforce).Sincetheinnerconductorofthe

7、rotorisalwayssymmetricallyarranged,theelectromagneticforceproducedbytheconductorisjustopposite,thusformingtheelectromagnetictorqueandcausingtherotortorotate.Becausethecurrentintherotorconductorisinducedbythemagneticfieldofthestatorrotation,itisalsocalledaninduct

8、ionmotor.Alsobecausetherotorspeedisalwayslowerthantherotatingspeedofthestatormagneticfield,soitisalsocalledasynchronousmotor.3.whycan'ttransformerchangeDCvoltage?Answ

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