placeholder · manufacturer · 5.imimg.com (IndiaMART)Passive Harmonic Filter
A passive harmonic filter is a line-side LCL network of reactors and tuned capacitors connected ahead of a non-linear load — typically a 6-pulse front-end diode rectifier in a VFD or DC drive — to reduce input current-harmonic distortion (THDi) and improve true power factor.
Overview
A passive harmonic filter is a line-side LCL network of reactors and tuned capacitors connected ahead of a non-linear load — typically a 6-pulse front-end diode rectifier in a VFD or DC drive — to reduce input current-harmonic distortion (THDi) and improve true power factor. ACE's design (existing site) combines a series low-pass and a shunt high-pass section that acts as the harmonic source for the load's harmonic demand, cutting harmonics at the supply end so the filter can be installed close to the load and reduce I²R and skin-effect losses in the bus ducts. Because all components are passive, the filter is rugged, maintenance-free, reliable and low-cost, with no electronic control circuitry. Buyers choose it as the most economical route to IEEE-519 compliance on 6-pulse drives, with guaranteed THDi performance (existing site: 8% max at 50% load, 5% max at full load) and over 97% efficiency.
Specifications
| Power/HP range | typically 5 HP to ~500 HP per unit; floor-mounted ranges extend to ~2,600 kVA for large AC VFD / DC SCR drives |
|---|---|
| Voltage class | LV 200-240 V / 380-480 V / 415 V / 575-690 V, 3-phase, 50/60 Hz |
| Topology | series low-pass + shunt high-pass (broadband LCL), tuned to dominant 5th/7th/11th/13th harmonics |
| Guaranteed THDi | 5% max at full load, 8% max at ~30-50% load (existing site) |
| Efficiency | >97% (existing site) |
| Configuration | 3P3W (balanced load) and 3P4W (corrects up to 25% unbalance) (existing site) |
| Power factor | near-unity / >0.95 across load range; optional input inductor for operation below ~20% load (existing site) |
| Enclosure | IP00 frame-mount (fits inside drive panel) up to IP20/IP54 cabinet |
| Cooling | natural air / forced-air convection |
| Applicable standards | IEEE-519, IEC 61000-3, IS 2026 / IEC 60076 (reactors) |
Applications
- Front-end six-pulse DC rectifiers (existing site)
- Variable-frequency drives (VFD) and motor applications (existing site)
- Automation equipment (existing site)
- HVAC equipment using motor drives (existing site)
- Waste-water / effluent treatment plants (existing site)
- Battery chargers (existing site)
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