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Power quality · preliminary engineering tools

Power-factor correction and harmonic mitigation, made clearer.

Two workbook-based calculators turn the supplied Eaton methods into fast planning tools. Use field measurements and transformer data, then confirm the final application with Collins Sales/Eaton.

Eaton workbook model

PFC resonance and harmonic-current check

Estimate the capacitor bank needed for target power factor, identify likely parallel resonance, and compare standard versus tuned-filter harmonic current.

01
System and source
Enter 0 when the utility-source value is unknown.
Load and correction target

Workbook VFD schedule + measured-load mode

HCU harmonic correction sizing

List each VFD by type, quantity, horsepower and pulse configuration, or switch to measured current and TDD. The tool estimates the correction needed to reach the selected targets.

02
VFD load schedule (maximum 12 rows)
The Eaton workbook applies a 15% reduction.
Drive typeQuantityHP eachPulse / filter
Pulse choices match the workbook: 6-pulse, 12-pulse, 18-pulse, or 5th-harmonic tuned filter.
Optional IEEE-style target support
When both optional fields are entered, the tool also shows the workbook-style TDD limit derived from short-circuit ratio. Your entered target remains the sizing target.

Ready for VFD data

List the connected drives.

Select the system voltage and enter each VFD’s type, quantity, horsepower and pulse configuration. All numeric inputs start at zero.

What this catches

The PFC tool flags resonance order and estimated capacitor/filter harmonic current before a bank is specified.

What this does not replace

A power-quality study, actual harmonic spectrum, short-circuit study, thermal review and current Eaton selection data are still required.

No product number guessing

The supplied spreadsheets calculate electrical requirements but do not provide a complete current catalog-number mapping, so this preview deliberately stops at engineering values.

PFC source basis: Eaton “Harmonic Tool for PFC-Revised 2014.xlsx,” including its source-impedance, resonance and tuned-filter calculations. Current Eaton PFC information ↗

HCU source basis: Eaton “EATON_HCU_CALC_070220April2015.xlsx.” The web schedule follows its PWM, VVI and CSI grouping, 70% close-load rule, 6/12/18-pulse factors, tuned-filter factor and centrifugal pump/fan reduction, with a consistent three-phase current conversion across the listed drives. A measured-load mode remains available. Preliminary results require Collins Sales/Eaton application review before equipment selection. Current Eaton HCU information ↗