Harmonic Filter Reactors | LV & MV Power Quality Solutions
Engineered with advanced VPI technology for fail-safe protection, our harmonic filter reactors are durable for your maximum uptime.
Our Standards
Grid Reliability: Harmonic Filter Reactors
- High-Linearity: Maintain 175%- 200% linearity.
- Advanced VPI: Extend lifespan and reduce noise.
- Fail-Safe Protection: High-precision NC thermal switch.
- Integrated Thermal Protection: UL-certified Class H (180°C) and Class R (220°C).
- Custom Engineering: Precisely match your network's harmonic profile.
Precision VPI Engineering
Processed with VPI, every one of our harmonic filter reactors is designed to enhance insulation performance and long-term stability.
No Moisture, No Short Circuits
High-pressure VPI protects your windings from moisture, electrical breakdown, and premature failure.
Ultra-Quiet Operation
Through deep resin penetration, vibration and noise can be dramatically reduced.
150,000+ Hours Running
Ensuring you continuous operation for over 17 years, our harmonic filter reactors deliver you a “set-and-forget” solution.
Superior Linearity and Inductance Stability
Engineered with high-linearity iron cores, our harmonic filter reactor ensures you:
175%–200% Overload Linearity
Even under extreme current surges (up to 175%–200%), the filter reactor ensures you linear inductance stability.
Capacitor Protection
Keeps your capacitor banks from thermal overload and dielectric breakdown.
Guaranteed IEEE 519 Compliance
Compliant with IEEE 519, our reactors deliver you a predictable, stable impedance profile.
Integrated Thermal Defense
To save your critical infrastructure from severe heat buildup, our harmonic filter reactor is:
Integrated NC Thermal Switches
Embedded directly inside, they can help prevent switchgear damage and fire hazards.
UL-Certified Class H (180°C) & Class R (220°C)
Our top-tier, high-temperature insulation system can withstand extreme thermal stress.
Zero Downtime Risk
The fail-safe protection helps both your personnel and your high-value electrical assets from catastrophic thermal events.
Why Engineers Choose LTECPower Harmonic Filter Reactors?
Our robust, high-performance harmonic filtering solutions are specifically designed for eliminating resonance and protecting your critical assets.
Customized Engineering Excellence
To meet your complex industrial load profiles, we offer LV and MV harmonic filter reactor solutions with precision engineering.
Superior Harmonic Suppression
Effectively preventing resonance and harmonic amplification, our high-linearity iron cores can maintain inductance up to 200%.
Advanced VPI Technology
The VPI ensures a moisture-proof structure that can help extend your equipment lifespan with ultra-quiet operation.
Active Fail-Safe Protection
Embedded with high-precision, normally-closed (NC) thermal switches, it ensures you an automatic defense shield for fire hazards.
Globally Certified Quality
Built with IEC 60076-6 and UL-certified Class H/R insulation, they are totally reliable for diverse grid requirements.
Proven Global Footprint
Trusted by partners across 60+ countries, we can deliver dedicated technical support for global infrastructure.
Common Applications of Harmonic Filter Reactors
Industrial Manufacturing & VFD Automation
Optimized for VDF performance and automated production lines, our harmonic filter reactors provide your sensitive rectifiers, PLCs, and drive-fed motors with essential defense.
Protection for Critical Control Systems
To keep your PLCs, sensitive sensors, and electronic control units from harmonic resonance and premature failure.
Cable & Transformer Thermal Relief
Reduces dielectric overheating in transmission cables and distribution transformers.
Maximum Efficiency
Ensures you continuous, stable operation with minimized maintenance.
Power Factor Correction in Heavy Industries
To enhance PFC efficiency and safeguard your capacitor bank, our harmonic filter reactors are widely applied in heavy industry operations, including steel plants, cement manufacturing, and mining facilities.
Switching Surge Protection
To eliminate inrush currents and voltage spikes, the harmonic filter reactors prevent equipment failure.
High-Linearity Stability
Even under severe, volatile harmonic loads, our reactors can deliver you a long-term stability.
Commercial Infrastructure & Data Centers
To protect your UPS systems, IT server racks, and automated HVAC controls, our harmonic filter reactors ensure you precision harmonic mitigation.
Zero Data Transmission Interference
Effectively mitigates triplen harmonics and high-frequency noise.
Ultra-Quiet Operation
Specifically designed for sensitive commercial and healthcare sites, the advanced VPI ensures you whisper-quiet operation.
Our Harmonic Filter Reactors Solutions
Designed with a compact footprint, high-linearity iron core, and integrated NC thermal switch, ideal for industrial power distribution and APFC systems.
Perfect for heavy industrial projects and utility-scale power quality management, ensuring grid-level stability.
Built with non-magnetic core construction, providing you with long-term, maintenance-free performance for high-current limiting, large-scale utility transformer protection.
Harmonic Filter Reactors Technical Data
Review our core engineering metrics for low-voltage and medium-voltage harmonic filter reactors.
| Application Scenario | Grid Voltage & Load Profile | Recommended Type | Detuning Factor (p%) | Resonance Frequency | Core Technology |
| Standard APFC (Low Harmonic) | 230V to 480V | LV Harmonic Reactor | 5.67% / 7% | N/A | Silicon Steel Iron Core |
| VFD/Converter Load (400V-480V) | 400V to 690V | LV Detuned Harmonic Filter Reactor | 5.67% / 7% | 210Hz / 189Hz | VPI Iron Core |
| Heavy Industrial/Utility (1kV+) | 1kV to 35 kV | MV Detuned Harmonic Filter Reactor | 7% / 14% | 189Hz / 135Hz | VPI Iron Core |
| High Current Fault/Utility | 11kV to 110 kV | Air-core Reactor | Customized | Variable / Tuned | Dry-Type Air-Core |
Typically, a capacitor bank is a low-impedance path for harmonic currents without a reactor. It will lead to resonance.
LTECPower Harmonic Filter Reactor Solution
With our reactor system, your capacitor bank will be free from harmonic amplification and overloading. It will significantly extend your equipment service life.
It depends on your grid's harmonic profile.
7% (189Hz)
As the industry standard type, the 7% detuning is best for heavy 5th harmonic pollution, such as standard VFDs and inverters.
14% (135Hz)
Specially designed for facilities with severe 3rd harmonic pollution, such as data centers and commercial single-phase loads, the 14% detuning is your best choice to avoid resonance and ensure stable operation.
"High linearity" means your reactor's capability for a stable inductance value under heavy current loads without magnetic saturation.
Engineered for high linearity up to 200%, our harmonic filter reactor ensures you perfect stability and keeps your system away from breakdown and failure.
No, absolutely not.
When connected to harmonic filter reactors, your capacitor bank's terminal voltage will increase. It will lead to failure or breakdown.
To ensure reliability, it is necessary to pair your reactors with over-rated capacitors. For example, use 480V or 525V capacitors for a standard 400V/415V system.
By building the windings and core into a solid, moisture-proof structure, the VPI process can prevent insulation breakdown.
At the same time, it can significantly reduce noise, making your reactors perfect for sensitive industrial environments, like data centers and hospitals.
To ensure you an effective thermal management, you are better off keeping a minimum clearance of 30 mm between units.
Furthermore, always put your reactors at the top of the enclosure. It will greatly prevent heat rising from affecting your capacitors.
All our reactors are built with an internal high-precision, normally-closed (NC) thermal switch. If winding temperature exceeds safety thresholds, the switch will automatically disconnect your system, safe and stable.
Sure.
We are good at customized solutions.
Whether you need specific detuning factors, specialized terminal configurations, or unique footprint dimensions, our engineering team can help you with a perfect solution.
We highly recommend an annual inspection. You can follow the steps below:
Electrical Integrity
Always retighten all terminal connections.
Thermal Safety
Make sure all thermal switches are properly wired and operational.
Airflow Cleaning
Clean all dust from the windings and core; ensure the cooling channels are clear.
Safety Warning
Before you touch any component, it is a must requre to keep your power system off and capacitor banks discharged at least 5 minutes.
All our manufacturing and testing procedures are strictly compliant with global quality, including:
Factory Management
Certified under ISO 9001 and ISO 14001.
Product Performance Standards
All compliant with IEC 60076-6 and IEC 61558-2-20.
Insulation Approvals
UL-recognized Class H/R insulation systems.
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