A Complete Power Factor & Harmonic Solution
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Passive Harmonic Filters (LC Type)
Dual-benefit technology: Mitigate harmful harmonics and improve power factor simultaneously using tuned LC circuits.
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Enhance Power Quality Through Harmonics Mitigation and Power Factor Improvement.
Passive harmonic filters, particularly of the LC (inductor-capacitor) type, are essential components in modern electrical systems. They are designed to address power quality issues caused by non-linear loads like VSDs, rectifiers, and inverters. By forming a tuned circuit, these filters effectively block or redirect specific harmonic frequencies (e.g., 5th or 7th order) while providing reactive power compensation.
Key Benefits
Harmonic Reduction
Significantly reduces Total Harmonic Distortion (THD) by absorbing dominant harmonic currents.
Power Factor Correction
Improves PF to near unity, reducing kVA demand and eliminating utility penalties.
Equipment Protection
Prevents overheating of transformers and cables, extending the lifespan of your infrastructure.
Cost Effective
A robust, low-maintenance alternative to active filters for stable loads with predictable harmonics.
Core Components & Technology
Our LC filters incorporate specialized components tailored for durability in high-voltage environments:
1. 7% Detuned Reactor
These inductors are connected in series with capacitors to shift the system's resonance frequency away from problematic harmonics. A 7% detuning (common in 50 Hz systems) creates a resonance at ~189 Hz, safely below the 5th harmonic (250 Hz).
- High Linearity: Consistent performance even during overloads.
- Low Losses: Typically <1% due to high-grade silicon steel cores.
- Function: Blocks high-frequency harmonics and limits inrush currents.
2. High-Voltage Heavy Duty Capacitors
We use premium capacitors from trusted brands like EPCOS, L&T, Shreem Electric, and Momaya.
| Component | Technology | Key Properties | Typical Brands |
|---|---|---|---|
| MPP Heavy Duty | Metalized Polypropylene | Self-healing, High overvoltage tolerance (110%), Low dissipation factor. | EPCOS (TDK), L&T, ABB, Schneider |
| APP Heavy Duty | All Polypropylene (Film-Foil) | Extreme durability, High current handling (1.5x), 5-year warranty options. | Shreem Electric, Momaya, Malde |
Design & Implementation Methodology
Designing an effective passive filter requires a site-specific approach:
- Harmonic Audit: We measure THD and identify dominant harmonics (5th/7th) using power quality analyzers.
- Component Selection: Calculating the exact detuning percentage (e.g., 7% or 14%) and matching reactor impedance.
- Tuning Calculation: Setting the resonance frequency below the lowest harmonic to avoid amplification.
- Installation: Seamless series/parallel connection at the load or busbar with automatic controllers.
- Validation: Post-installation THD testing to ensure compliance with IEEE 519 standards.
Frequently Asked Questions
When should I choose a Passive Filter over an Active Filter?
Passive filters (LC type) are ideal for facilities with stable loads and specific, predictable harmonic issues (like a large VFD). They are significantly more cost-effective than Active Harmonic Filters (AHF), which are better suited for highly fluctuating, complex loads.
Can this filter reduce my electricity bill?
Yes. By improving the Power Factor and reducing harmonic losses (skin effect, heating), passive filters lower your kVA demand and eliminate penalty charges, directly reducing your monthly bill.
What brands of capacitors do you use?
We use only genuine, heavy-duty capacitors from industry leaders like EPCOS, L&T, Shreem Electric, Momaya, and Malde to ensure long service life and safety.
Solve Your Harmonic Issues Today
Contact PS Power Controls for a customized LC filter design and quote.
Custom Engineering
Tailored LC circuits designed for your specific load profile.
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