电容电抗器的选用注意课件

KurKoulu/17.3.00/ALe11.電容與電抗的諧振頻率2.電容器耐壓3.電抗器耐流4.電容器製造廠商需具備 製造電抗器能力電容電抗器的選用需注意KurKoulu/17.3.00/ALe2電容與電抗的諧振頻率XL=6%XC:204Hz

245Hz50Hz

60Hzf(Hz)Z(Ω)f0=245電容性電感性避免大於第五諧波的諧振300240180KurKoulu/17.3.00/ALe3XL=7%XC:189Hz

227Hz50Hz

60Hzf(Hz)Z(Ω)f0=227電容性電感性避免大於第四諧波的諧振300240180電容與電抗的諧振頻率KurKoulu/17.3.00/ALe5XL=6%XC:204Hz

245HzXL=7%XC:189Hz

227HzXL=14.8%XC:130Hz

156Hz諧振頻率的選擇視負載產生之最低階次諧波而定50Hz

60Hz電容與電抗的諧振頻率KurKoulu/17.3.00/ALe6電抗器耐流額定依IEEE標準Permissibleovervoltage:5%(cont.)Permissible3rdharmonic:0.5%ofU1Permissible5thharmonic:5.0%ofU1Permissible7thharmonic:5.0%ofU1Thermalcurrentofreactor:1.05×Irms(Specificationforelectricenvironment)BusVoltageatPCCIndividualVoltageDistortion(%)TotalVoltageDistortionTHD(%)69kvandbelow69.001kVthrough161kV161.001kVandabove3.01.51.05.02.51.5NOTE:High-voltagesystemscanhaveupto2.0%THDwherethecauseisanHVDCterminalthatwillattenuatebythetimeitistappedforauserKurKoulu/17.3.00/ALe7380V50kvar76AI1=76A×1.05I3=I5=I7=Ith=不可只考慮I1Ith=1.05×√I12+I22+…+In-12+In2**I1=1.05×ICNP(考慮6%過電壓)**Irms=√I12+I22+…+In-12+In2Thermalcurrentofreactor電抗器耐流額定KurKoulu/17.3.00/ALe9V5VCVSystemVC60HzVC

=VC60Hz

+V5VSystemVCPermissibleovervoltageVC60Hz=1.06‧Vsystem電容器耐壓KurKoulu/17.3.00/ALe10系統電壓電容器耐壓額定208V280V220V280V380V480V440V600V460/480V600V**串接6%電抗器之電容器選定電容器耐壓KurKoulu/17.3.00/ALe11裝設位置高壓/低壓適用負載穩定之負載(諧波量小，功因較