X电容和放电电阻计算以及Y电容漏电流计算.xls

X电容和放电电阻计算以及Y电容漏电流计算.xls

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LeakageCurrentandCapacitanceDischargeCalculatorforXcapsandYcapsTheselectionofanAClinefilterinfluenceshowapieceofequipmentwillperformduringproductsafetytests.Specifically,capacitancedischargeisanissueoftheXcapacitanceofthefilter.LeakagecurrentisprimarilyafunctionoftheYcapacitance.EnterthevalueoftheXcapacitorsandYcapacitorsimplementedinthelinefilteryouareconsideringtogetanideaofhowthefilterwillperfomduringasafetyanalysis.TotalnominalXcapacitance:

4uFTotalnominalshuntresistance:

400kOhmsUse10MOhmsifthereisnoshuntresistance（proberesistance）.Nominal,onebranch,Ycapacitance:

10.8nFMainsvoltage（worstcase）:

120VrmsMainsfrequency（worstcase）:

60HzWiththesevaluestheresultsofyoursafetytestswilllookapproximatelylikethoseshownbelow.Leakagecurrentfromlinetoground:

0.4886mACommonlimitsare.75mAforungroundedequipment,and3.5mAforgroundedequipment.Timeconstantofcapacitancedischarge:

1.600sNormally,thevoltageacrosstheplugpinsmustbelessthanPeakvoltageacrosspinsafteronesecond:

90.84Vpeak62.79VpeakonesecondafterbeingdisconnectedVoltageacrosspinsaftertenseconds:

0.33Vpeakfromthesupply.Industrialtwistlockconnectorsmustcomplywiththesamelimit,buttensecondsafterdisconnectionfromtheirsupply.LeakageCurrentandCapacitanceDischargeCalculatorforXcapsandYcapsTheselectionofanAClinefilterinfluenceshowapieceofequipmentwillperformduringproductsafetytests.Specifically,capacitancedischargeisanissueoftheXcapacitanceofthefilter.LeakagecurrentisprimarilyafunctionoftheYcapacitance.EnterthevalueoftheXcapacitorsandYcapacitorsimplementedinthelinefilteryouareconsideringtogetanideaofhowthefilterwillperfomduringasafetyanalysis.Use10MOhmsifthereisnoshuntresistance（proberesistance）.Commonlimitsare.75mAforungroundedequipment,and3.5mAforgroundedequipment.Normally,thevoltageacrosstheplugpinsmustbelessthanonesecondafterbeingdisconnectedfromthesupply.Industrialtwistlockconnectorsmustcomplywiththesamelimit,buttensecondsafterdisconnectionfromtheirsupply.