电容电抗器的选用注意.ppt

KurKoulu/17.3.00/ALe,1,1.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/ALe,2,電容與電抗的諧振頻率,XL= 6% XC : 204Hz 245Hz,50Hz 60Hz,f(Hz),Z(),f0=245,電 容 性,電 感 性,避免大於第五諧波的諧振,300,240,180,KurKoulu/17.3.00/ALe,3,XL= 7% XC : 189Hz 227Hz,50Hz 60Hz,f(Hz),Z(),f0=227,電 容 性,電 感 性,避免大於第四諧波的諧振,300,240,180,電容與電抗的諧振頻率,KurKoulu/17.3.00/ALe,4,XL= 14.8% XC : 130Hz 156Hz,50Hz 60Hz,f(Hz),Z(),f0=156,電 容 性,電 感 性,避免大於第三諧波的諧振,300,240,180,電容與電抗的諧振頻率,KurKoulu/17.3.00/ALe,5,XL= 6% XC : 204Hz 245Hz,XL= 7% XC : 189Hz 227Hz,XL= 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/ALe,6,電抗器耐流額定,依IEEE 標準,Permissible over voltage : 5% ( cont.) Permissible 3rd harmonic: 0.5% of U1 Permissible 5th harmonic: 5.0% of U1 Permissible 7th harmonic: 5.0% of U1 Thermal current of reactor: 1.05 Irms,( Specification for electric environment),Bus Voltage at PCC,Individual Voltage Distortion(%),Total Voltage Distortion THD(%),69kv and below 69.001kVthrough 161kV 161.001kV and above,3.0 1.5 1.0,5.0 2.5 1.5,NOTE: High-voltage systems can have up to 2.0% THD where the cause is an HVDC terminal that will attenuate by the time it is tapped for a user,KurKoulu/17.3.00/ALe,7,380V50kvar 76A,I1 = 76A 1.05 I3 = I5 = I7 = Ith =,不可只考慮I1,Ith=1.05I12 + I22 + + In-12 + In2,* I1 = 1.05 ICNP (考慮6%過電壓),* Irms = I12 + I22 + + In-12 + In2,Thermal current of reactor,電抗器耐流額定,KurKoulu/17.3.00/ALe,8,LOAD,System voltage regulation and fluctuation,TR,SC,_ + + _,VH,VC,VL,_ +,電容器耐壓,VC = VS + VL + VH,KurKoulu/17.3.00/ALe,9,V5,VC,VSystem,VC60Hz,VC = VC60Hz + V5,VSystem,VC,Permissible over voltage VC60Hz = 1.06Vsystem,電容器耐壓,KurKoulu/17.3.00/ALe,10,