6. من أعلى قدرة معامل على حافظ0.9(Lagging)منشأتك في.
جداا هامه قوانين
Power in Watts
kW = kVA x Cosθ
kW = HP x 0.746 or (HP x 0.746) / Efficiency (HP =
Motor Power)
kW = √ ( kVA2– kVAR2)
kW = P = VI Cosθ … (Single Phase)
kW = P =√3x V x I Cosθ … (Three Phase)
Apparent Power in VA
kVA= √(kW2+ kVAR2)
kVA = kW/ Cosθ
Reactive Power in VA
kVAR= √(kVA2– kW2)
kVAR = C x (2 π f V2)
Power factor (from 0.1 to 1)
7. Power Factor = Cosθ = P / V I … (Single Phase)
Power Factor = Cosθ = P / (√3x V x I) … (Three Phase)
Power Factor = Cosθ = kW / kVA … (Both Single Phase
& Three Phase)
Power Factor = Cosθ = R/Z … (Resistance / Impedance)
XC = 1/ (2 π f C) … (XC = Capacitive reactance)
IC = V/ XC … (I = V / R)
IC = V 2 F C
IC = QC / V
IC = V / (1 / 2 π F C)
XC = V / IC
XC = 1 / 2 π F C
Required Capacity of Capacitor in Farads/Microfarads
C = kVAR / (2 π f V2) in microfarad
Required Capacity of Capacitor in kVAR
kVAR = C x (2 π f V2)
12. المكثف سعه لمعرفه
C =kvar /2×3.14 ×50×380×380
C=2679÷ 45341600= 0.0000059
فى مضرب6^10=
59فاراد ميكرو
المكثف تيار لمعرفه
Ic = Q/v
Ic =893÷220=4.05 A
اخرى طريقه
Ic =2679÷380=7.05
Ic =7.05 ÷1.732=4.07 A