Harmonic Filtering Solutions
At KTH ELECTRIC, we specialize in providing optimal harmonic filtering solutions for industrial electrical systems. Let our experienced technical team help you eliminate power quality issues, improve operational efficiency, and drastically reduce maintenance costs.
Implementation of passive filters, active filters (AHF), and isolation transformers in industrial electrical systems.
Quick Summary
- Eliminate THD: Keep Total Harmonic Distortion below the critical 5% threshold.
- Protect Equipment: Prevent overheating in transformers, motors, and cables.
- Save Energy: Active filtering decreases energy losses by up to 10%.
- Custom Engineering: We analyze whether Series Reactors, Passive Filters, or Active Filters fit your exact nonlinear loads.
What Are Harmonics, and Why Should They Be Filtered?
Harmonics cause the distortion of pure sine current and voltage waveforms. This distortion leads to increased energy losses, severe overheating, and drastically reduced equipment lifespan.
Classification of Loads: Linear vs. Nonlinear
| Load Type | Characteristics | Examples |
|---|---|---|
| Linear | Current waveform is sinusoidal and matches voltage waveform. | Direct on-line motors, incandescent lights, resistive heaters. |
| Nonlinear | Current waveform is distorted, non-sinusoidal, injecting harmonics back into the grid. | VFDs (Inverters), UPS systems, computer power supplies, arc furnaces. |
Effects of Harmonics on Electrical Systems
The damage caused by untreated harmonics spans both technical degradation and massive financial loss.
| Type of Effect | Details |
|---|---|
| Technical Degradation |
|
| Economic Loss |
|
• Semiconductor industry: ~109 billion VND
• Data centers: ~21 billion VND per hour
• Telecommunications: ~863 million VND per minute
Total Harmonic Distortion (THD): THDu and THDi
To quantify power quality, engineers measure Total Harmonic Distortion (THD):
| Index | Explanation |
|---|---|
| THDu (Voltage) | Measures voltage distortion in the system. High THDu affects all equipment connected to the bus. |
| THDi (Current) | Measures current distortion injected by specific devices (like VFDs). |
| Acceptable Standard | THD typically needs to be kept strictly below 5% to ensure good power quality and grid compliance. |
Effective Harmonic Filtering Solutions
KTH Electric engineers evaluate your specific nonlinear load profile to recommend the optimal filtering topology.
| Method | Mechanism | Pros & Cons |
|---|---|---|
| Series Reactor (Choke) | Increases impedance to reduce harmonics and absorb voltage transients. | Pros: Low cost, easy install. Cons: Limited effectiveness for high-order harmonics. |
| Isolation Transformer | Isolates noise and cancels triplen harmonics through delta-star configuration. | Pros: Excellent noise filtering. Cons: Higher investment cost. |
| Passive Filter | Uses tuned capacitors and reactors to trap specific frequency ranges (e.g., 5th or 7th harmonic). | Pros: Simple, reliable. Cons: Inflexible if system loads change. |
| Active Filter (AHF) | Dynamically cancels harmonics by injecting opposite-phase currents in real-time. | Pros: >95% efficiency, perfectly adapts to changing loads. Cons: Highest initial capital cost. |
Benefits of Harmonic Mitigation
- Reduced CAPEX: Safely use standard cable sizes and fully rate transformers.
- Lower OPEX: Decrease total facility energy losses by up to 10%.
- Extended Equipment Lifespan: Eliminate the hidden overheating destroying your transformers and motors.
- Improved Uptime: Prevent nuisance breaker tripping and protect sensitive electronics from voltage sags.
Eliminate Power Quality Issues Today
Don’t let invisible harmonics destroy your equipment. Contact our engineering team for a full THD analysis and custom filtering solution.
Schedule a Power Quality Audit
