Factory-assembled active harmonic filter cabinets built with Forte GRIDSINE modules. Three tiers: Standard (GRIDSINE-G), Compact (GRIDSINE-C) and Premium SiC (GRIDSINE-X). Same cabinet platform as the SVG panels, with a control card and firmware for harmonic filtering only.
Forte AHF Panels are factory-assembled active harmonic filter cabinets, each built around one of three GRIDSINE module tiers. The panel platform is the same as the SVG panels: CT, main breaker, HMI, controller and internal wiring. The difference is the control card and firmware, which run harmonic filtering instead of reactive power compensation.
GRIDSINE-G: Standard Series. 2nd–51st harmonic, 220V–690V, up to 200 A/module. For general industry and 690V plants.
GRIDSINE-C: Compact Series. 2nd–51st harmonic, 400V, up to 150 A. Slim modules for retrofit and tight cabinets.
GRIDSINE-X: Premium SiC Series. 2nd–51st harmonic, 220V–380V, 4 µs response. For arc furnaces and steel.
All three reduce THDi to below 5% at the point of common coupling, which meets IEEE 519 and IEC 61000-3-4. Each harmonic order can be given its own priority. Cabinets run in parallel for higher capacity, and every cabinet passes FAT before shipment.
All three panels share the same cabinet platform. The AHF module determines harmonic filtering performance.
| Parameter | GRIDSINE-G | GRIDSINE-C | GRIDSINE-X |
|---|---|---|---|
| Series | Standard | Compact | Premium SiC |
| Switching technology | Advanced IGBT, 3-Level | High-Density IGBT, 3-Level | SiC MOSFET, 3-Level |
| Operating voltage | 220V / 400V / 480V / 690V | 400V (-15%~+15%) | 220V – 380V |
| Module capacity (A) | 15 · 25 · 30 · 50 · 75 · 100 · 125 · 150 · 200 A | 30 · 50 · 75 · 100 · 150 A | 20 · 35 · 50 · 75 · 100 A |
| Response time | ≤ 50 µs / ≤ 5 ms total | ≤ 10 ms | 4 µs / ¼ cycle (harmonic) |
| Harmonic filtering range | 2nd – 51st | 2nd – 51st | 2nd – 51st |
| Switching frequency | 25.6 kHz | 20 kHz | > 100 kHz |
| THDi reduction | < 5% at PCC | < 5% at PCC | < 5% at PCC |
| Selective filtering | Yes — individual harmonic priority | Yes — individual harmonic priority | Yes — individual harmonic priority |
| Max. parallel modules | 20 modules | 20 modules | 10 modules (smart rotation) |
| Operating temperature | −20°C ~ +55°C | −25°C ~ +55°C | −25°C ~ +55°C |
| System efficiency | ≥ 97.5% | ≥ 97.5% | Up to 98% |
| Filtering effectiveness | ≥ 98% | > 95% | Up to 98% |
| 3-Phase balancing | Yes (Active) | Yes (Active) | Yes (Active) |
| Overload | Auto-limited at 100% rated capacity | Auto-limited at 100% rated capacity | 110% Continuous |
| Communication | RS485, CAN Bus, Modbus RTU, Mobile APP, Optional HMI | RS485 / CAN, Optional HMI | Bluetooth / Mobile APP, RS485 / CAN / RJ45 |
| IP Protection | IP20~IP54 | IP20 | IP20 |
| Best for | General industry, 690V plants | Retrofit, tight spaces, broad filtering | Arc furnaces, steel, extreme harmonics |
These features are standard across all three AHF Panel types.
| Parameter | Specification |
|---|---|
| Product | Forte AHF Panel — Active Harmonic Filter Cabinet |
| Frequency | 50 / 60 Hz |
| Connection type | 3P3W and 3P4W |
| THDi target | < 5% at point of common coupling (PCC) |
| Compensation mode | Selective harmonic / broadband / combined with reactive |
| Communication | Modbus RTU + Ethernet + RS485 |
| HMI | 7″ / 10″ touch screen LCD with harmonic spectrum display |
| Auto-commissioning | One-button setup with automatic CT ratio detection |
| Protection | Integrated main breaker, surge protection, thermal monitoring |
| Current transformers | Built-in CTs (matched to cabinet capacity) |
| Enclosure rating | IP31 / IP42 / IP54 (configurable) |
| Cooling | Forced fan cooling with smart speed control |
| Parallel operation | Multiple cabinets in parallel — linear capacity scaling |
| Factory testing | Full FAT before shipment |
| Standards | IEC 61000-3-4 / IEC 61439-1 / IEEE 519 |
The module injects counter-phase harmonic current. THDi at the point of common coupling falls below 5%, which is the IEEE 519 and IEC 61000-3-4 limit.
Covers the 2nd harmonic (arc furnaces) through the 51st (high-frequency switching loads).
Each harmonic order can be enabled, disabled or prioritised on its own. For example, the 5th and 7th get priority while the 11th and 13th are only monitored.
Real-time harmonic spectrum display shows individual harmonic magnitudes before and after filtering. Trend logging and alarm history accessible from the cabinet front panel.
One-button commissioning detects the CT ratio, measures the existing harmonic profile and sets the filtering priorities.
Several AHF Panels run in parallel with automatic load sharing and harmonic current distribution. Filtering capacity scales with the number of cabinets.
Four cases sorted by the harmonic orders the load produces.
Variable frequency drives are the largest source of harmonic distortion in most plants. The AHF Panel cleans the bus at the MCC level.
UPS systems and server power supplies produce 5th and 7th harmonics. These orders are given priority in the filter.
Rectifier-fed DC drives for crushers and conveyors. Harmonic content sits at the 6-pulse and 12-pulse characteristic orders, which the filter targets.
LED lighting, IT equipment and lift drives. Triplen harmonics overload the neutral in 3P4W systems; the filter is connected 3P4W.
Filtering current and cabinet layout follow from the measured harmonic profile. Sizing is free of charge before any commitment.
Technical documents for this product. Ask for a document still in preparation and we will send it as soon as it is ready.
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