静变电源培训Maintena.pptVIP

…thesafechoice...The12-pulsetransformertransformsthethreephasesofthemainsintosixphases.Thesixphasesarerectifiedina12-pulsesemi-conductorfullbridge.Therectifierismadeupofsixthyristor/diodemodules.3ofeachareplacedonaDC/ACmoduleandthe3remainingoneareplacedonacoolingelementbelowtheDC/ACmodule.Thecombinationofthe12-pulserectifier,the12-pulsetransformerandtheinputfilterchokemeansthatthereishardlynoharmonicfeedbackintothemains(i.e.nomainspollution/distortion).(12脉冲变压器将3相输入电源变为6相。6相通过12-脉二极管全桥整流。整流器由6个半导体闸流管/二极管模块组成，其中3个安装在DC/AC模型上，3个安装在DC/AC模型下的散热器上。12-脉冲整流器、12-脉冲变压器及输入滤波电感的混合意味几乎没有谐波返回到输入回路.（也就是没有输入电路/畸变）。)The12-pulserectifieralsoprovidesasoftstartbygraduallyincreasingthefiringangleofthethyristors.Thisway,theinrushcurrentcausedbythelow-passfilter’scapacitorislimitedtoavalueinferiortotheconverter’snominalcurrent.Duringoperation,thethyristorsarefullyturnedonandtherectifierbridgeisactingasanun-regulated6-phaserectifierbridge.(12-脉冲整流器也通过逐步打开二极管的导通角实现软启动。这样来讲，通过低通滤波的电容器使输入电流被限制为低于静变电源正常电流值。在操作过程中，二极管的导通角全部打开，整流器桥是不需要调整的6相整流器一样工作。)??…thesafechoice...The12-pulserectifiersystemischaracterisedbyanalmostsinusoidallinecurrentandapowerfactorbetterthan0,96.Thismeanslessstressonthemainsupplynetworkanddistributiontransformers.(12-脉冲整流器系统的特征为正弦曲线电流，功率因数大于0.96。这意味着减少对输入网络和变压器输出的影响。)?TheDCFiltersmoothesthepulsatingDCvoltagefromthe12-pulserectifiertoalevelwhichdoesnotcauseanysignificantvoltagemodulationattheoutput.Atohmicinductiveload,thefilter‘scapacitorbatterysuppliesthereactivepartofthecurrentwhichmeansthattheconverter’sapparentoutputpower(kVA)mightbebiggerthantheconsumedpower.(DC滤波减少DC电压的波动，从12-脉冲整流器输出,不会影响任何明显输出电压模块的水平。在阻性负载中，滤波器的电容储能提供了部分由于感抗引起的电流，意味着静变电源外部视在功率（kVA）可能大于消耗功率。)?Basedontheun-regulatedDCvoltage,theconvertersinv