Why Inc. R&D · Tokyo, Japan
Denka Platinum: Eliminate High-Frequency Electrical Noise. Cut Losses. Protect Critical Assets.
Denka® Platinum Plates are passive, clip-on Ni-Zn ferrite-ceramic High-Frequency Passive Filters (150 kHz–30 MHz) engineered to attenuate conducted emissions from VFDs, solar inverters, rectifiers, and switch-mode power supplies — without rewiring or downtime.
- Energy reduction
- 8–15%
- Typical reduction in specific energy consumption (kWh/ton) across industrial installations — up to 20%.
- Targeted band
- 150 kHz–30 MHz
- The CISPR 11 conducted-emission band, where conventional IEEE 519 harmonic filters do not operate.
- Attenuation per plate
- 13–15%
- Peak high-frequency voltage attenuation per plate (25–30 MHz), independently verified at KU Leuven / EnergyVille.
- Facilities
- 100+
- Field-proven worldwide across cement, manufacturing, ceramics, and commercial plants, with payback under 1.5 years.
About the company & technology
A critical blind spot in modern industrial power systems
Developed by the R&D Department of Why Inc. (Tokyo, Japan) under the leadership of Executive Chairman Dr. Alaa Alyaman, Denka® addresses a critical blind spot in modern industrial power systems: high-frequency conducted emissions.
While traditional power-factor correction capacitors and low-order harmonic filters manage distortion below 2.5 kHz, fast-switching power electronics (VFDs switching at 2–16 kHz and SMPS at 20+ kHz) inject steep voltage edges (dv/dt) that generate conducted electromagnetic noise well into the MHz range.
Denka® HF Passive Filters clip directly onto existing phase conductors to absorb this high-frequency energy at the source.
The problem
The hidden cost of HF distortion
- 01+19%
Motor losses & thermal feedback
Converter-generated HF harmonics increase total induction motor losses by 8.7% to 19%, raise iron losses under load by 29%, and elevate winding temperatures by ≈ 8 °C. Each 1 °C rise in a 37 kW motor adds ≈ 41 W of secondary losses.
- 02+33%
Transformer & cable degradation
Inverter HF harmonics raise distribution transformer eddy-current losses by up to 33% and accelerate insulation ageing by 22%. In cables, the skin effect confines 30 MHz currents to a 0.012 mm outer layer (versus 9.2 mm at 50 Hz), spiking AC resistance.
- 0351%
Premature bearing & insulation failure
Every 10 °C temperature rise halves electrical insulation life. Meanwhile, bearings account for 51% of motor failures — driven in VFD-fed motors by HF common-mode currents discharging through bearings and causing EDM pitting and fluting.
- 04
Control & metering interference
High-frequency conducted emissions circulate locally between nearby equipment and filter capacitors, causing nuisance RCD breaker trips, PLC and smart-metering disruptions, and LED flicker.
How it works
How the HF Passive Filter works
- 01
Zero impact on 50/60 Hz fundamental power
Engineered from a Grade DT400L Ni-Zn ferrite-ceramic composite (μ(ω) = μ′(ω) − jμ″(ω)), the real permeability component (μ′) dominates at 50/60 Hz, adding negligible reactance so line power passes unaffected.
- 02
Loss-dominated HF absorption (150 kHz–30 MHz)
Across the CISPR 11 high-frequency band, the imaginary loss component (μ″) rises sharply. The plate acts as a frequency-dependent resistor, absorbing HF magnetic-field energy around the conductor and dissipating it as a minuscule amount of heat (≤ 0.4 °C self-heating).
- 03
Dual-point clip-on protection
Installed with zero rewiring or galvanic contact at the Distribution Level (breaker outputs feeding VFDs, rectifiers, and PV inverters) to stop network propagation, and at the Motor Level (drive-output cables) to block common-mode bearing currents.
Specifications
Technical specifications
| Function | Passive high-frequency conducted-noise filter (complements IEEE 519 filters) |
|---|---|
| Version | Denka® Platinum Plate (Black) |
| Material | Sintered Ni-Zn ferrite-ceramic composite (Grade DT400L) |
| Dimensions & weight | 50 mm × 25 mm × 3.5 mm · approx. 21 g per plate |
| Design band | 150 kHz to 30 MHz (CISPR 11 conducted-emission band) |
| Lab-verified attenuation | Broadband 1–30 MHz; 13–15% (≈ 1.2–1.4 dB) per plate at 25–30 MHz (KU Leuven) |
| Self-heating & isolation | ≤ 0.4 °C under HF absorption · high-resistivity ceramic · no galvanic contact |
| Safety & maintenance | Zero maintenance · non-radioactive, asbestos-free, halogen-free, RoHS compliant |
Evidence
Verified case studies & lab validation
A selection of independently measured results. Many more case studies — across industries and countries — are available upon request.
Laboratory validation
13–15%
KU Leuven / EnergyVille (Belgium)
Tested by the Power Electronics Research Group using an Agilent 4294A precision impedance analyzer across 1–30 MHz, confirming frequency-dependent HF voltage attenuation peaking at 13–15% per plate at 25–30 MHz.
Heavy industry
−7.0%
Cleopatra Cement Factory (Egypt)
Independently measured by SGS on raw-mill induction drives: a 7.0% reduction in specific energy consumption (46.88 → 43.76 kWh/t) and a 59% reduction in power-draw variance.
Manufacturing
−11.5%
GSF Industrial Facility (Egypt)
An 11.5% plant-level reduction in specific power consumption (78.69 → 69.61 kW/t), true power factor improved from 0.94 to 0.96, and full payback in under 1.5 years.
Ceramics & solar
24.5% → 9.8%
Saj Ceramics (Kenya, with BEST Energy)
Site observations recorded current distortion (THDᵢ) on Glaze Prep Mill 8 dropping from 24.52% to 9.76%, and on gasifier pump circuits from 84.89% to 54.11%.
Diagnostic & M&V protocol
Every deployment is engineered and verified
Using IPMVP Option B/C and ASHRAE Guideline 14 standards, in five steps:
- 01
HF spectrum survey
On-site 2 kHz–30 MHz RF current probe sweep via portable spectrum analyzer.
- 02
Thermal baseline
Calibrated infrared thermography of terminals, cables, and motor boxes.
- 03
Power-quality baseline
Class A logging of THDᵢ, THDᵥ, and true power factor.
- 04
Energy-to-production regression
Logging active kWh against production tonnage over a full cycle.
- 05
Post-installation A-B-A verification
Repeating all baselines after clip-on installation to certify net energy recovery.
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