KVAR RATING CALCULATOR,CAPACITOR BANK SIZE CALCULATION

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  Determination of Required Capacitor Rating by measurement 3 Methods are used. 1. Measurement with current and power factor 2.Measurement with recording of Active and Reactive power. 3.Measurement by Reading Meters . 1 . Measurement with Current and power factor The active power P is calculate from the measured voltage V ,apparent current Is and Power Factor P=√3*Voltage*apparent Current*cosψ *10^-3 If the desired power factor cosψ has been specified, the capacitor power rating can be calculate from the following formula: Qc = P. (tan ψactual - tanψ desired) Let's See the Example Measured Apparent Current Is : 248 Amps Power Factor cos ψ1 = 0.86 Desired Cos ψ2 = 0.92 Voltage V :397 V p=√3 * 397 * 248 * 0.86 * 103 P = 146.6 KW Qc= P. (tanψ actual - tanψ desired) = 146.6(0.59 - 0.42) = 24.9 KVAR
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Calculate the specific weight, mass density, specific gravity and specific volume

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 Calculate the specific weight, mass density, specific gravity and specific volume of oil having a volume of 4.5m³ and weight of 40kN?

Data is given in the Question.

Volume of Oil =4.5m³ 

weight of oil =40kN =40X10³ N


1.Specific Weight:

w=weight of oil/Volume of oil

   =40X10³ N/4.5

   =8.889X10³ N/m³ 

2. Mass Density of oil

ρ=Specific weight of oil / Acceleration due to gravity

 =w/g

=8.889X10³ N/m³ / 9.81

=906.1 kg/m³ 

3.Specific gravity of Oil

S=Specific weight of Oil / Specific weight of water

  =8.889X10³ N/m³ /9.81

 =0.906

4. Specific Volume of Oil

  V=1/ρ

    =1/906.1 kg/m³ 

   =1.1x10^-3  m³/kg   


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