Power Quality
Active Harmonic Filters
Power-electronic compensation equipment used to address measured current-harmonic conditions produced by non-linear loads.
- Pathway
- Power quality
- Basis The final rating and component selection follow actual load, system and site inputs.
- Configured to application
- Reviewed This is the latest editorial and technical-content review date, not a product certification date.
- 08 Aug 2026
When this solution is considered
- Power-quality measurements identify significant current harmonics that vary with the connected load mix.
- Non-linear equipment such as drives, rectifiers or electronic power supplies affects the installation current waveform.
- A project requires dynamic harmonic mitigation rather than a fixed passive arrangement.
What we need to understand
The useful starting point is the actual electrical system and operating requirement—not a generic rating request.
- 01
Power-quality study data with current spectrum, operating states and measurement locations.
- 02
Single-line diagram, transformer and system impedance information where available.
- 03
Non-linear load inventory, diversity and anticipated future additions.
- 04
Existing capacitor banks, filters and power-factor correction equipment.
- 05
Target measurement point, installation location and environmental constraints.
Active Harmonic Filters — engineering principle
This diagram explains the functional pathway only. Device ratings, protection settings, conductor sizing and interlocks are engineered from the approved project inputs.
Final ratings, protection, earthing, settings and interlocks follow approved project engineering.
Open full-size SVGConfiguration considerations
- Compensation capacity is based on measured harmonic current and representative operating combinations.
- Connection point, current sensing, coordination with capacitors and existing filters are part of the system design.
- Enclosure, cooling, protection, monitoring and communication depend on the installation and project scope.
Typical applications
These examples indicate where the solution may be considered; they do not represent completed Arnav projects.
- Facilities with variable-frequency drives and changing production-load combinations.
- Industrial utilities or process systems with rectifier and power-electronic loads.
- Installations where measurement confirms a dynamic current-harmonic mitigation requirement.
Frequently asked questions
Can an active harmonic filter be selected without measurements?
A dependable selection should use representative power-quality measurements, the load inventory, operating combinations, connection point and existing correction equipment.
Where should harmonic measurements be taken?
Measurement locations depend on the question being investigated. The incoming supply, affected feeder and significant non-linear loads may all be relevant to separating system-wide and local conditions.
Does an active filter replace every other power-quality measure?
No. Harmonic filtering is one part of a wider system that may also involve source impedance, load-side measures, power-factor correction, voltage conditions and equipment-specific requirements.
Need help?
Share your active harmonic filters requirement.
Send the information already available. The initial review can identify the remaining inputs needed to define scope.
Measure before selecting the function
Observed symptoms lead to a defined measurement boundary, an evidence-led function and a verified outcome.
Final ratings, protection, earthing, settings and interlocks follow approved project engineering.
Open full-size SVG