電容電抗器的選用注意ppt課件

1、KurKoulu/17.3.00/ALe1 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/ALe2電容與電抗的諧振頻率XL= 6% XC : 204Hz 245Hz50Hz 60Hzf(Hz)Z()f0=245電電容容性性電電感感性性避免大於第五諧波的諧振避免大於第五諧波的諧振300240180KurKoulu/17.3.00/ALe3XL= 7% XC : 189Hz 227Hz50Hz 60Hzf(Hz)Z()f0=227電電容容性性電電感感性性避免大於第四諧波的諧振避免大於第四諧波的

2、諧振300240180電容與電抗的諧振頻率KurKoulu/17.3.00/ALe4XL= 14.8% XC : 130Hz 156Hz50Hz 60Hzf(Hz)Z()f0=156電電容容性性電電感感性性避免大於第三諧波的諧振避免大於第三諧波的諧振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(chǎn)生之諧振頻率的選擇視負載產(chǎn)生之最低階次諧波而定最低階次諧波而定50Hz 60Hz電容與電抗的諧振頻率Ku

3、rKoulu/17.3.00/ALe6電抗器耐流額定依IEEE 標準Permissible over voltage : 5% ( cont.)Permissible 3rd harmonic: 0.5% of U1Permissible 5th harmonic: 5.0% of U1Permissible 7th harmonic: 5.0% of U1Thermal current of reactor: 1.05 Irms ( Specification for electric environment)Bus Voltage at PCCIndividual Voltage Dist

4、ortion(%)Total Voltage Distortion THD(%)69kv and below69.001kVthrough 161kV161.001kV and above3.01.51.05.02.51.5NOTE: 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 userKurKoulu/17.3.00/ALe7380V50kvar 76AI1 = 76A 1.

5、05I3 =I5 =I7 =Ith =不可只考慮I1Ith=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/ALe8LOADSystem voltage regulation and fluctuationTRSC_+_VHVCVL_+電容器耐壓VC = VS + VL + VHKurKoulu/17.3.00/ALe9V5VCVSystemVC60HzVC =

6、VC60Hz + V5VSystemVCPermissible over voltage VC60Hz = 1.06 Vsystem電容器耐壓KurKoulu/17.3.00/ALe10系統(tǒng)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裝設位置裝設位置高壓高壓/低壓低壓適用負載適用負載穩(wěn)定之負載穩(wěn)定之負載 (諧波量小，功因較差之負載諧波量小，功因較差之負載)改善效益改善效益1.提高功率因數(shù)提高功率因數(shù) 2.吸收諧波電流吸收諧波電流1030% (針對特定諧波