Power Factor Correction Capacitors Sizing Calculations – Part Fourteen


Today, we will explain the most (4) famous power factor correction capacitor calculators.

 
Power Factor Correction Capacitors Calculators

 
 
The most (4) famous power factor correction capacitor calculators are as follows:
  1. Arteche Reactive Power and Harmonic Resonance Point Calculator,
  2. Eaton Power Factor Correction Calculator,
  3. AccuSine Sizing Spreadsheet,
  4. Square-D (Schneider Electric) Calculator.
 
and Finally our exclusive spreadsheet:

      5. calculation of the need for power factor correction & sizing calculations
 

  

First: Arteche Reactive Power and Harmonic Resonance Point Calculator

 
 
 
This calculator includes (4) parts as follows:
  1. Data Entry Part,
  2. Results Part,
  3. Power Triangle Part,
  4. Frequency Scan Part.
 

 
 
1-      Data Entry Part
 
 
1- ENTER Transformer Data: use the value by moving the following sliding bars:
  • Rating in KVA
  • V primary in Volts
  • V secondary in Volts
  • Impedance in %
  • Frequency in HZ
 
2- ENTER Load Data: use the value by moving the following sliding bars:
  • System load in KW
  • Initial Power Factor
  • Target Power Factor
 

 
 
2-      Results Part
 
 
After you enter the data in Data Entry Part, the results are shown as follows:
  • Active Power (P)=                   KW
  • Total Power (S1) (without Capacitors) =        KVA
  • Reactive Power (Q1) (without Capacitors) =              KVAR
  • Load Current (without Capacitors) =              Amps
  • Required kVAR =
  • Total Power (S2) (with Capacitors) = KVA
  • Reactive Power (Q2) (with Capacitors) =                   KVAR
  • Load Current (with Capacitors) =                   Amps
  • Savings =
  • Voltage Boost =
 
 

 
3-      Power Triangle Part
 
 
It shows the total, active and reactive power values on power triangle after and before PF correction based on the entered data.
 

 
 
4-      Frequency Scan Part
 
 
It shows the curve representing relation between the impedance response % and harmonic number and estimate the harmonic order based on the entered data.

 
 
To get your copy from Arteche Reactive Power and Harmonic Resonance Point Calculator, please click the link.

 
 

Second: Eaton Power Factor Correction Calculator

 
 
This professional calculator is available to use only online. It includes (2) main screens as follows:
  1. The first main screen,
  2. The second main screen.
 

 
 
The First Main Screen
The first main screen is an Introduction for the calculator which explains the function of the calculator and how does it works?
 
 
Function of the calculator
Are you interested in learning more about the possibility of lowering your facilities' monthly utility bill? Eaton's electrical products for Power Factor Correction and Harmonic Mitigation correct poor Power Factor By entering the utility data for your facility, the Eaton Power Factor Correction Calculator helps you to determine how a higher Power Factor may reduce your monthly utility bill.
 
How Does It Work?
To calculate Power Factor Correction for your facility, the calculator performs two main functions:
  1. Determines the capacitor size required to reach your desired Power Factor (PF) level. Based on the required capacitance, a determination is made on voltage rise, harmonic resonance, and breaker size required for installation.
  2. Estimates the potential return on investment (ROD' you can achieve by installing the recommended capacitors, including the estimated timeline required for Payback.
Important note:
  • There are many considerations when installing capacitors banks. This calculator provides a general idea of how adding capacitance to your facility can help reduce or eliminate utility Power Factor charges. Harmonics and other Power Quality concerns should be considered before installing capacitor equipment.
 

 
 
The Second Main Screen
 
 
Click “Get Started” button on the main screen, a new screen appears which asks you to select the location of the capacitance in your plant distribution system from (2) available locations:
  1. At the Load: Direct Connection
  2. At the Service Feeder: Bus Connection
 

 
 
Case#1: selection of “At the Load: Direct Connection”
 
Step#1
 
Please select from the three drop-down selections below:
  1. Type of Motor
  2. Induction Motor HP range
  3. Number of poles & nominal motor speed (RPM)
 
The above three drop-down menus will give the following selections for each type of motor:
Used for high efficiency motors and older design (Pre”T-frame”):
HP range
3
5
7.5
10
15
20
25
30
40
50
60
75
100
123
150
200
250
300
350
400
450
500
 
 
No Number of poles & nominal motor speed (RPM)
2 – 3600 RPM
4 – 1800 RPM
6 – 1200 RPM
8 – 900 RPM
10 – 720 RPM
12 – 600 RPM
 
`-T-Frame' NEMA 'Design B' Motors 1:
HP range
2
3
5
7.5
10
15
20
25
30
40
50
60
75
100
123
150
200
250
300
350
400
450
500
 
Number of poles & nominal motor speed (RPM)
2 – 3600 RPM
4 – 1800 RPM
6 – 1200 RPM
8 – 900 RPM
10 – 720 RPM
12 – 600 RPM
 
NEMA design C:
HP range
15
20
25
30
40
50
60
75
100
123
150
200
250
300
 
 
nominal motor speed (RPM)
1800 RPM
1200 RPM
900 RPM
 
NEMA design D:
HP range
15
20
25
30
40
50
60
75
100
123
150
200
250
300
 
 
 
Wound Rotor Motors:
HP range
15
20
25
30
40
50
60
75
100
123
150
200
250
300
 
 
 
Induction Motor:
HP range
3
5
7.5
10
15
20
25
30
40
50
60
75
100
123
150
200
250
300
350
400
450
500
 
 
 
Number of poles & nominal motor speed (RPM)
2 – 3600 RPM
4 – 1800 RPM
6 – 1200 RPM
8 – 900 RPM
10 – 720 RPM
12 – 600 RPM
 
Step#2
 
 
 
after you make complete selections from step#1 for your design case, click “Calculate Capacitance” button it will give you the following data for the direct connect capacitance:
  1. Amount of KVAR
  2. Eaton’s Part number
Note:
The Eaton’s capacitor part number is based on across the line motor starting. For VFD applications, the capacitors shall be filtered. For soft starters and other types of applications, please consult Eaton.
This screen also gives you (3) options:
  1. Find out more about bus connection
  2. Calculate another motor
  3. Contact for pricing
Also, you have another button “Start Over” to start a new calculation. You can also send an e-mail to a power quality expert by clicking the “Ask Eaton a Question?” button at any time.

  

 
Case#2: selection of “At the Service Feeder: Bus Connection”
 
Step#1: Calculate required capacitance, voltage rise, harmonics resonance, and circuit breaker size.
 
 
Select from drop-down menus for the following data:
  • Select the system voltage value from the following selections:
System Voltage
208 V
220 V
240 V
380 V
415 V
460 V
480 V
550 V
575 V
600 V
 
  • Select the unit of existing load of the facility from the following selections:
Unit Of Facility Load
KW
KVA
Amps
 
  • Select the unit of current PF level & the desired PF level from the following selections:
Unit Of Current PF Level & The Desired PF Level
Kvars
PF
 
  • Then, enter the following data:
  1. The existing load of the facility,
  2. The current PF level,
  3. The desired PF level,
  4. And finally, your transformer impedance and size information.
 
Note:
  • If you are unsure of the steps used to obtain any of the values required by the calculator. Eaton will conduct free site evaluation to assist you. You can also send an e-mail to a power quality expert by clicking the “Ask Eaton a Question?” button at any time.
  • Now you can click the “Calculate Step 1” button to go to Calculate step#1 screen or click “Start Over” button to start a new calculation.
 
Calculate step#1 Results screen
 
 
The results of your initial calculation are shown in this screen as follows:
  1. Max. % bus volt rise (at no load)
  2. Parallel resonance at the calculated capacitor sizing
  3. Breaker Size in Amps
  4. Capacitor Sizing (for exact correction) and for (closest common size)
  5. It gives also a Harmonics Alert to check harmonics or not.
If you click the button “Click to See Resonance at Each Step” a new screen named  “Resonance at Each Step “ will open which shows:
Kvar
Resonance
Harmonic alert
 
 
After reviewing this screen “Resonance at Each Step” you can click the “Close and Return” button
 
After reviewing the results, use the links below to:
  1. Send an e-mail to a power quality expert by clicking the “Ask Eaton a Question?” button.
  2. Start a new calculation by clicking “Start Over” button.
  3. Update the original information you entered by clicking “Update Step 1 Info” button,
  4. Or begin the next step by clicking “Begin Step 2” button.
 

 
 
Step#2-A: Select your rate structure & calculate ROI
 
 
Choose your utility rate structure from the drop-down list; the selection will be as follows:
  1. KW Demand with PF adjustment (Type 1)
  2. KW Demand with PF adjustment (Type 1a)
  3. KW Demand with PF adjustment (Type 1b)
  4. KW Demand with PF adjustment (Type 1c)
  5. KW Demand + Reactive Demand charge (Type 2)
  6. KW Demand + Reactive Demand charge (Type 2a)
  7. KVA Demand (Type 3)
  8. KW Demand with PF adjustment (Type 4)
  9. Enter Penalty Directly
 
How Do I Choose?
  • Every utility relies on a slightly different rate structure. However, most utilities use similar methods to establish monthly utility bills for industrial and commercial customers. The rate type methods shown here are designed to help you determine if raising the Power Factor with the use of Eaton Cutler-Hammer Power Factor Corrective Capacitors may reduce your monthly utility bill. Click each rate type to identify the utility rate structure that most closely matches your own. When you have found a match, select your rate structure from the drop-down list box above, complete the appropriate information.
  • To learn more about selecting your utility rate structure, refer to the information shown by Click each Rate Type to learn more.
 
 
Rate Type 1: KW Demand and Power Factor Adjustment
 
 
KW billing demand charge is based on a utility-specified demand interval, typically 15- or 30-minute, measured demand charge during the month. Energy charge related to KW demand usually uses phrases like 0.00 per kwh first 000 kwh per KW demand. There are 4 variations to this type of billing method as follows:
  • Rate Type 1: The Power Factor adjustment clause used with this method increases or decreases the net demand charge X% for each Y% the Power Factor is above or below the utility specified Power Factor.
  • Rate Type 1A: If the Power Factor is less than a specified X%, the utility may multiply the measured KW demand by X% and divide the result by the actual Power Factor during the month.
  • Rate Type 113: If the Power Factor is less than a specified X%, the monthly demand charge shall be increased by an amount equal to S0.00 per KVA of capacitors required to the Power Factor from the % to X%.
  • Rate Type 1C: If the Power Factor is less than a specified X%, the KW demand may be taken as X% of the measured KVA.
 
Rate Type 2
 
 
Demand and Reactive Demand Charge KW billing demand charge is based on a utility-specified demand interval, typically 15- or 30-minute, measured demand charge during the month. Energy charge related to KW demand usually uses phrases. there are 2 variations to this type of billing method as follows:
  • Rate Type 2: Reactive demand charge with this method refers to $0.00 per KVA of Reactive demand in excess of X% of the KW demand.
  • Rate Type 2A: Reactive demand charge with this method refers to $0.00 per KVAR for all over KVAR per KW of actual demand.
 
Rate Type 3: KVA Demand Charge
 
 
  • The KVA will be the maximum of the utility-defined timeframe, typically 15- or 30-minutes, measured Kw demand in the month divided by the average leading or lagging Power Factor during such month.
  • KVA demand calculated dividing the measured KW demand by the present Power Factor. The KVA demand charge is calculated by multiplying this calculated KVA demand times the cost per KVA.
 
Rate Type 4
 
 
  • The monthly bill is adjusted up or down by a multiplier based on a look-up table that cross-references present Power Factor with a multiplier value.
  • Demand and/or energy billing will be multiplied by a factor from a cross-reference table that equates Power Factor to a multiplier value. Calculations are performed both at present Power Factor and at corrected Power Factor. The difference between these values is the savings (penalty) obtained from changing your Power Factor.
 
Then click “Calculate Step 2” button to calculate your potential return on investment (ROI).
also you can click the “Return to Step 1” button  to Update the original information you entered in step#1 or click the “Ask Eaton a Question?” button to Send an e-mail to a power quality expert.
 

 
 
Step#2-B: entering the data based on your selection of utility rate structure
If you click “Calculate Step 2” button, a new screen will open, then enter the data required by each type of utility rate structure.
 
After entering the data, use the links below to:
  1. Send an e-mail to a power quality expert by clicking the “Ask Eaton a Question?” button.
  2. Update the original information you entered in step#1 by clicking “Return to Step 1” button,
  3. Learn more about selecting your utility rate structure by clicking “How Do I Choose?” button
  4. Or calculate step#2 by clicking “Calculate Step 2” button.
 

  

 
Step#2-C: ROI Results
 
 
The results from your calculations are shown in this screen as follows:
 
Installed cost
Annual savings
Payback in months
Fixed Cap and Breaker
 
 
 
Switched Cap and Breaker
 
 
 
Fixed Harmonic Filter and Breaker
 
 
 
Switched Harmonic Filter and Breaker
 
 
 
 
After reviewing the results of this screen, use the links below to:
  1. Send an e-mail to a power quality expert by clicking the “Ask Eaton a Question?” button.
  2. Update the original information you entered in step#1 by clicking “Return to Step 1” button,
  3. Update the original information you entered in step#2 by clicking “Return to Step 2” button,
  4. Or start a new calculation by clicking “Start Over” button.
 
 

 
You can use the Eaton power factor correction calculator online from the following link:

 

 

 
Third: AccuSine Sizing Spreadsheet

Forth: Square-D (Schneider Electric) Calculator

 
 
 
AccuSine Sizing Spreadsheet
 





Square-D (Schneider Electric) Calculator


 

For the third and fourth calculators, you can review our article “Capacitor Sizing for Power Factor Correction”.
 



5- Need for Power Factor Correction & Sizing Calculations

 

 
 
This spreadsheet is used to determine the need for power factor correction capacitors for existing installation by determination of the approximate savings possible through power factor penalty reduction and loss reduction. Then the savings are compared with the probable cost of capacitors to determine if it is economical. it calculates also the KVAR rating required for power factor correction.
To download your copy of this spreadsheet, please go to article “Power Factor Correction Capacitors Sizing Calculations – Part Seven”.
 

 
 
In the next article, we will explain how to choose protective devices and cables for Power Factor Correction Capacitors Calculators. Please, keep following.

 The previous and related articles are listed in below table:

Subject Of Previous Article
Article
Glossary of Power Factor Correction Capacitors
 
Types of Loads,
The Power Triangle,
What is a power factor?
Types of power factor
Why utilities charge a power factor penalty?
Billing Structure.
 
What causes low power factor?
Bad impacts of low power factor,
Benefits of Power Factor correction.
 
How to make Power Factor Correction?
Types of Power Factor Correction Capacitors
Individual compensation
 
Group compensation,
Central compensation,
Hybrid compensation.
Summary for Power Factor Correction Capacitors Sizing Calculations Steps
 
 
Step#1: Collect Monthly Billing Data
Step#2: Make Some Preliminary Measurements For Current And Voltage
 
Step#3: Fill the Economic Screening Worksheet
 
Step#4: Make Preliminary Measurements For Harmonics
Step#5: Repeat the Economic Screening Worksheet
Step#6: Compare the Savings with the Probable Cost of Capacitors' Installation
Second: Design Phase
Step#1: Performing a Detailed Plant Survey
Step#1.A: Review the one line diagram
Step#1.B: Take into consideration the loads that produce harmonics
Step#1.C: collect sufficient data Inventory by using measuring instruments
 
 
 
Step#2: Select Economical Capacitor Scheme
Step#3: Checking the "No Load" Voltage Rise
Step#4: Select Capacitor Switching Options
Step#5: Check the Harmonic Distortion and make Harmonic Mitigation Options
Step#6: Use the Economic Screening Worksheet again
 
Power Factor Correction Capacitors Sizing Calculations Steps For New Designs

 
Factors Affecting The Rated KVAR For a Capacitor
Calculation of the Capacitor KVAR Rating for Compensation at:
1-Transformer
2-Individual Motors

 
3- Calculation Of The Capacitor KVAR Rating For Buildings And Power Plants(Group Compensation)
 
Harmonics Effects On Power Factor Capacitors
Harmonic Limits in Electric Power Systems (IEEE 519-2014)
Options to Reduce Harmonics for PFCC
Power Factor Compensation In Case Of Harmonics