Capacitor Bank Calculator. Capacitor Bank Kvar Calculation, Sizing, Formula

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Capacitor bank calculator

Hello engpocket friends, have you ever heard about capacitor bank? The capacity of a capacitor bank is measured in kVAR (kilovolt-ampere reactive).

⚡ Capacitor Bank Calculator (kVAR)

Required Capacity
0
kVAR

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Know deeper about capacitor bank

After you use the capacitor bank calculator, do you wonder what is a capacitor bank?

A capacitor bank is a group of several capacitors of the same rating connected in series or parallel to store electrical energy. In industrial power systems, the primary purpose of a capacitor bank is power factor correction (PFC).

capacitor bank calculator

Why we calculate capacitor bank?

We calculate the capacitor bank (Kvar) to determine the exact size of the capacitor needed to raise the power factor from a low value (for example 0.70) to an ideal value (example 0.95 or 0.98). Proper calculation will prevent over correction, which can cause voltage instability.

Capacitor bank kVAR formula

Want to know how the capacitor bank calculator works?

This is the formula

Qc=P×(tan(φ1)tan(φ2))Qc = P × (tan(φ1) – tan(φ2))

QC : Required capacitor bank capacity (kVAR)
P : Active power or real load (kW)
Φ1 : Initial phase angle, calculated from arccos (initial cosΦ)
Φ2 : Target phase angle, calculated from arccos (target cosΦ)

Case example of capacitor bank calculation

A textile factory has an active power load of 250 kW. The power factor (Cos Φ) is measured at a low 0.70. The engineer manager wants to improve the power factor to 0.95 to avoid utility penalties. Calculate the required capacitor bank capacity (kVAR)

What we know:P=250 kWcosϕ1=0.70tanϕ11.020cosϕ2=0.95tanϕ20.329Conclusion:QC=P×(tanϕ1tanϕ2)QC=250×(1.0200.329)QC=250×0.691QC=𝟏𝟕𝟐.𝟕𝟓 kVAR\begin{aligned} \text{What we know:} \\ P &= 250 \text{ kW} \\ \cos \phi_1 &= 0.70 \Rightarrow \tan \phi_1 \approx 1.020 \\ \cos \phi_2 &= 0.95 \Rightarrow \tan \phi_2 \approx 0.329 \\ \\ \text{Conclusion:} \\ Q_C &= P \times (\tan \phi_1 – \tan \phi_2) \\ Q_C &= 250 \times (1.020 – 0.329) \\ Q_C &= 250 \times 0.691 \\ Q_C &= \mathbf{172.75 \text{ kVAR}} \end{aligned}

That is all for the capacitor bank calculator. We also have breaker size calculator in this link.

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