問題1：三相輸入，額定電壓480Vac（北美），X電容采用星型接法275Vac、X2的行不行呢？我問生產(chǎn)廠家，他告訴我這個電容（275Vac、X2）可以工作在額定電壓305Vac，只是標(biāo)示方法不同而已——對此我有些疑問，有沒有專門做安規(guī)電容的前輩來指點(diǎn)一下。
問題2：這個275Vac（電容上標(biāo)的），是不是指的額定工作電壓，我看廠家給我的資料上沒有列出他的最大允許工作電壓，問是多少，他又說不出來。
請教大家兩個安規(guī)電容問題，謝謝！
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1 Capacitors used to bridge BASIC INSULATION, SUPPLEMENTARY INSULATION or REINFORCED
INSULATION shall be class Y except that it is permitted to bridge BASIC INSULATION in a SECONDARY
CIRCUIT by a class X capacitor.
2 The voltage rating of the capacitor shall be at least equal to the RMS WORKING VOLTAGE across the
insulation being bridged, determined according to 2.10.2.2.
3 For a single capacitor bridging FUNCTIONAL INSULATION, BASIC INSULATION or SUPPLEMENTARY
INSULATION, the peak test voltage of the capacitor shall be at least equal to the REQUIRED WITHSTAND
VOLTAGE.
4 For a single capacitor bridging DOUBLE INSULATION or REINFORCED INSULATION, the peak test voltage
of the capacitor shall be at least equal to twice the REQUIRED WITHSTAND VOLTAGE.
5 It is permitted to use a higher grade capacitor than the one specified, as follows:
- subclass Y1 if subclass Y2 is specified;
- subclass Y1 or Y2 if subclass Y4 is specified;
- subclass Y1 or Y2 if subclass X1 is specified;
- subclass X1, Y1 or Y2 if subclass X2 is specified.
6 It is permitted to use two or more capacitors in series in place of the single capacitor specified, as follows:
- subclass Y1 or Y2 if subclass Y1 is specified;
- subclass Y2 or Y4 if subclass Y2 is specified;
- subclass X1 or X2 if subclass X1 is specified.
7 If two or more capacitors are used in series, they shall
- all have the same nominal capacitance value;
- each be rated for the total RMS WORKING VOLTAGE across the insulation; and
- comply with the other rules above.
從上面看，電容至少要等于橋接的相電壓，275V的肯定不行，要480V的，即便是兩個電容串聯(lián)，單個電容也滿足480V
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@tsj5212000
1CapacitorsusedtobridgeBASICINSULATION,SUPPLEMENTARYINSULATIONorREINFORCEDINSULATIONshallbeclassYexceptthatitispermittedtobridgeBASICINSULATIONinaSECONDARYCIRCUITbyaclassXcapacitor.2ThevoltageratingofthecapacitorshallbeatleastequaltotheRMSWORKINGVOLTAGEacrosstheinsulationbeingbridged,determinedaccordingto2.10.2.2.3ForasinglecapacitorbridgingFUNCTIONALINSULATION,BASICINSULATIONorSUPPLEMENTARYINSULATION,thepeaktestvoltageofthecapacitorshallbeatleastequaltotheREQUIREDWITHSTANDVOLTAGE.4ForasinglecapacitorbridgingDOUBLEINSULATIONorREINFORCEDINSULATION,thepeaktestvoltageofthecapacitorshallbeatleastequaltotwicetheREQUIREDWITHSTANDVOLTAGE.5Itispermittedtouseahighergradecapacitorthantheonespecified,asfollows:-subclassY1ifsubclassY2isspecified;-subclassY1orY2ifsubclassY4isspecified;-subclassY1orY2ifsubclassX1isspecified;-subclassX1,Y1orY2ifsubclassX2isspecified.6Itispermittedtousetwoormorecapacitorsinseriesinplaceofthesinglecapacitorspecified,asfollows:-subclassY1orY2ifsubclassY1isspecified;-subclassY2orY4ifsubclassY2isspecified;-subclassX1orX2ifsubclassX1isspecified.7Iftwoormorecapacitorsareusedinseries,theyshall-allhavethesamenominalcapacitancevalue;-eachberatedforthetotalRMSWORKINGVOLTAGEacrosstheinsulation;and-complywiththeotherrulesabove.從上面看，電容至少要等于橋接的相電壓，275V的肯定不行，要480V的，即便是兩個電容串聯(lián)，單個電容也滿足480V
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