RHF-Hybrid
RHF-Hybrid range combines the benefits of the passive and active technologies and at the same time eliminates their disadvantages.
A circuit similar to the RHF-8P is eliminating the mayor part of the Harmonics while the active filter takes care of the fine-tuning in harmonic performance. In part load, any passive harmonic filter will cause a reactive current. As the harmonic current is low in part load, the RHF-Hybrid use the resources of the active filter component and eliminates the reactive power.
In addition the active filter component control the switching of the two passive filter circuits, which allows to size the active component to about 10% of the RHF-Hybrid rating, which makes the Hybrid not only superior in performance, but also competitive in price.
This diagram show the smooth true power factor of the RHF-Hybrid. Close to 1 at any operating point.
The harmonic performance of the RHF-Hybrid is unique, even for strong distorted networks.
|
Application |
RHF-8P <8% THDi |
RHF-5P <5% THDi |
RHF-Hybrid ~1% THDi |
Active <5% THDi |
|
Vaiable Frequency Drives – VFD |
Yes |
Yes |
Yes |
Yes |
|
Water and wastewater treatment |
Yes |
Yes |
Yes |
Yes |
|
HVAC |
Yes |
Yes |
Yes |
Yes |
|
Pumps and Fans (VFD) |
Yes |
Yes |
Yes |
Yes |
|
Industrial/ Factory Process (VFD) |
Yes |
Yes |
Yes |
Yes |
|
DC charger |
Yes* |
Yes* |
Yes |
Yes |
|
Buildings |
Yes |
Yes |
Yes |
Yes |
|
Data Center (power supply) |
No |
No |
Yes |
Yes |
|
IEEE 519-2014 requirement |
Yes* |
Yes |
Yes |
Yes |
|
Marine |
Yes |
Yes |
No |
No |
|
IEEE 519-2014 specified application |
Yes |
Yes |
Yes |
Yes |
|
Electronically comutated / EC Motor |
No |
No |
Yes |
Yes |
|
Non symetrical Load |
No |
No |
No |
Yes |
|
Symetrical load multiple VFD |
Yes |
Yes |
Yes |
Yes |
|
Symetrical load multiple equimpment |
No |
No |
No |
Yes |
|
Displacement factor correction („pf“) |
No |
No |
No |
Yes |
|
Unbalance compensation |
No |
No |
No |
Yes |
Ideally all loads and sources have a pure sinusoidal current waveform. But unfortunately the true waveform of most equipment is very different. Nonlinear loads like for example the diode input bridge of a 6 pulse drive, are causing a distortion of the mains voltage. This distortion typically evaluated by the Total Harmonic distortion THD, evaluates frequencies from the 2nd up to the 40th harmonic. In a 50Hz Network this is the area between 100Hz and 2kHz.
The impact of the voltage distortion is diverse, and the most typical effect is overheat of transformer and PFC applications (Capacitor banks). Underestimated impacts of harmonic distortion is the significantly reduced lifetime expectation of electrical and mechanical equipment.
The Revcon Harmonic Filter (RHF) avoids the harmonic distortion of nonlinear loads and sources. The filter is not tuned to a specific frequency, but works like a bandwidth filter, reducing all frequencies up to the 50th harmonic. The RHF filter reduces the Total Harmonic Distortion of the current (THDi) to a level significantly below 5%. This is necessary to reach various standards, for e.g. IEEE 519-2014, who are getting more and more common.
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