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Calculation for Capacitor Bank requirement for a power distribution system

Posted Date: Total Responses: 0 Posted By: Aditya Member Level: Gold Points/Cash: 2

Calculation and selection of required capacitor rating
Qc = P * {tan [acos (pf1)] - tan [ acos (pf2)]}
Qc = required capacitor output (kVAr)
pf1 = actual power factor
pf2 = target power factor
P = real power (kW)

The table below shows the values for typical power factors in accordance with the above formula

Actual Power Factor

--------- 0.7;0.75;0.8;0.85;0.9;0.92;0.94;0.96;0.98;1
--------------------------------------------------------
0,40--- 1.27; 1.41;1.54;1.67;1.81;1.87; 1.93;2; 2.09;2.29

0,45--- 0.96;1.1;1.23;1.36;1.5;1.56;1.62;1.69;1.78;1.98

0.5---- 0.71;0.85;0.98; 1.11;1.25;1.31; 1.37; 1.44; 1.53; 1.73

0,55--- 0.5; 0.64; 0.77; 0.9; 1.03; 1.09; 1.16; 1.23; 1.32; 1.52

0,60--- 0.31; 0.45; 0.58; 0.71; 0.85; 0.91; 0.97; 1.04; 1.13; 1.33

0,65--- 0.15; 0.29; 0.42; 0.55; 0.68; 0.74; 0.81; 0.88; 0.97; 1.17

0,70--- 0; 0.14; 0.27; 0.4; 0.54; 0.59; 0.66; 0.73; 0.82; 1.02

0.75--- 0; 0.13; 0.26; 0.4; 0.46; 0.52; 0.59; 0.68; 0.88

The required capacitor output may be calculated as follows:
select the factor (matching point of actual and target power factor) k
calculate the required capacitor rating with the formula:
Qc = k * P
Example:
actual power factor = 0.70, target power factor = 0.96, real power = P = 500kW,
------------------------------------
Qc = k * P = 0.73 * 500kW = 365 kVAR
-------------------------------------

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Author: G.Dharmalingam

Member Level: Bronze

Revenue Score: 1 out of 5

Can u put in XL File

Author: Pawan Bahuguna

Member Level: Diamond

Revenue Score: 1 out of 5

Thanks

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