Power System Studies
Harmonic Analysis
Power-quality studies for facilities with VFDs, UPS systems, and other non-linear loads. We diagnose distortion before it damages equipment.
Overview
Variable-frequency drives, rectifiers, and UPS systems pull non-sinusoidal current that distorts voltage waveforms across the facility. Excessive harmonic distortion causes transformer overheating, capacitor failure, neutral overload, and nuisance tripping. We measure existing distortion with power-quality recorders, model the system in ETAP or EasyPower, and recommend filters, transformer K-factor specifications, or VFD configuration changes that bring you back into IEEE 519 compliance.
What's included
Scope of work
On-site harmonic measurement (typically 7–14 days with PQ recorders)
Source impedance characterization
Frequency-domain modeling of the distribution network
Voltage and current distortion calculation at the point of common coupling
IEEE 519 compliance evaluation
Mitigation recommendation: passive filters, active filters, K-factor transformers, or drive-side mitigation
Methodology
How the engagement runs
A consistent process means predictable timelines, fewer surprises, and a defensible record if anyone (AHJ, insurance, OSHA) asks how the work was done.
- 01
PQ recording
Class A power-quality meters deployed at the service and selected feeders for 7–14 days.
- 02
Network modeling
Frequency-domain model built reflecting transformer impedances, cable, and VFD/rectifier sources.
- 03
Distortion analysis
THD-V and THD-I evaluated against IEEE 519 limits at the PCC and at problem buses.
- 04
Mitigation design
Filter tuning, transformer phase-shifting, or drive-side LCL filter recommendations modeled and verified.
- 05
Report
PE-stamped report with measurement data, simulation results, and prioritized recommendations.
Stamped
100%
Every deliverable PE-stamped by a licensed engineer in the project state. Across all 24 registered states.
Response
1 day
We respond to every inquiry within one business day with a scoped proposal and a real timeline.
Veteran-owned
VOSB / SDVOSB
SAM.gov registered. UEI H6HAZKAD4LJ7 · CAGE 08E02. Set-aside eligible.
When you need it
Triggers
- →Wastewater or pump-station VFD installations
- →Transformer or capacitor overheating
- →Neutral conductor overheating in 3-phase 4-wire systems
- →Utility power-factor or distortion penalty
- →New VFD or UPS commissioning
What you receive
Deliverables
- PE-stamped harmonic analysis report
- PQ measurement data exports
- Single-line and harmonic-source identification
- Mitigation design package (filter specs, transformer specs, drive settings)
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Ready to scope your harmonic analysis engagement?
Send us the basics (facility type, equipment, timeline) and we’ll respond with a scoped proposal within one business day.