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# Power factor correction calculations for power system – MS Excel Spreadsheet

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## Power Factor correction using static capacitor

Calculation formulas as follows:

• Q1 =  I losses + Cu losses
• Q2 = PkW · (Tanφ1 – Tanφ2)
• losses = 2% ·  Str
• Cu losses = USC% · Str
• Q = Q1 + Q2

Where:

• Q1 = Reactive power to be compensated at the terminals of a transformer due to no load and load losses.
• Q2 = Reactive power to be compensated due to total reactive components of lighting, power and mechanical loads.
• Q = Overall reactive power to be compensated to achieve target power factor.
• I losses = Transformer no load losses = Iron core losses.
• Cu losses = Transformer load losses = Copper losses.
• Str = Transformer rating (KVA).
• P = Maximum demand load on the Main distribution board (kW).
• φ1 = Inverse cosine of power factor before compensation.
• φ2 = Inverse cosine of target power factor.
• Usc% = Short circuit percentage impedance voltage of the transformer.

Power Factor Values assumptions before compensation:

• For lighting outlets = 0.96
• For power outlets and receptacles = 0.8
• For motors = 0.8

Inputs = Transformer size + Transformer type + kVA Max. demand load for the whole system + PF before compensation + Target value of PF.

Outputs = Reactive power to be compensated at the terminals of a transformer due to no load and load losses.

• Reactive power to be compensated due to total reactive components of lighting, power and mechanical loads
• Overall reactive power to be compensated to achieve target power factor + circuit breaker size required to protect the capacitor bank.

1. Zagi Mefah
May 25, 2020

Need training on power factor correction

2. Naimish
Feb 17, 2020

A 1000-KVA transformer is loaded to 850 KVA at a power factor of 0.82
lag. Calculate the leading kVAR necessary to correct the power factor to 0.95 lag.
If the transformer has a rated conductor loss equal to 1.0% of the transformer rating,
calculate the energy saved assuming 24-hour operation at the operating load.

3. Sep 01, 2019

very nice

4. Aug 31, 2019

hi, I seeking standard that report desirable Power Factor in distribution network.
is it possible anyone guide me.

5. md rahmat kamil
May 17, 2019

sir request 1kva transformer design and calculation winding bobbin size select
testing report valve with reference range
send me sir pdf

6. Segun Omotosho my
May 17, 2019

Good topics,
Thanks so much.

thanks so much

7. Jacques Habimana
May 17, 2019

Merci beaucoup pour votre contribution dans le métier

8. Isaac Asiedu Mensah
May 16, 2019

9. Andres Avelar
May 16, 2019

LES AGRADEZCO POR LA OPORTUNIDAD QUE NOS DAN EN AMPLIAR NUESTROS CONOCIMIENTOS AL PRESENTAR EXCELENTES ARTÍCULOS. FELICIDADES

10. Jordan Araujo
Nov 17, 2016

Thanks for such a great and very useful tools for electrical engineering. This is a great website for our profession.

11. Hapsari Dewi
Nov 14, 2016

Thank You for the article and the excel spreadsheet

12. SUBODH JHA
Aug 19, 2014

THANKS FOR SUCH A GOOD INFORMATION & KNOWLEDGE.

13. Mahmoud Salama
Aug 15, 2014

Many Thanks for publishing this calculation sheet on your reputable site. it gave me much pleasure and confidence to create other sheets to share knowledge and introduce Fast tools.

14. 15. 