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Low-cost state-of-the-art alternative for replacing electro-mechanical power factor solutions
  Harmonics Filtration

Harmonics pollution increasingly becomes a dominant powerquality problem, mainly due to modern loads. Coping with this issue using capacitor bank has two alternatives:

De-tuned Systems

In de-tuned systems, reactors are installed in series with the capacitors and prevent resonance conditions by shifting the capacitor/network resonance frequency below the first dominant harmonic (usually the 5th). The top graph on the right shows the capacitor/network amplification factor and the shifting of the resonance frequency from near the 5th harmony to near the 3rd harmony.

Tuned Systems

If harmonic filtration is needed, on top of resonance prevention, tuned reactors are applied. The capacitor/reactor filter is tuned to absorb particular harmonics and reduce the Total Harmonic Distortion (THD). The bottom graph on the right shows harmonic filtration using tuned system: the voltage THD was reduced bymore than 70% (8.8% to 2.5%) and the dominant harmonics (5th and 11th) were reduced by 75%.

Tuned ACTIVAR vs. Active Harmonic Filters

Active filters inject currents to the network in anti-phase to the harmonics. This technology is an expensive solution, and increases system losses (3% typical). For applications with one or two dominant harmonics, Elspec’s tuned ACTIVAR is the preferred choice, both technically and economically, effectively minimizing system losses and reducing the THD.



Welding Machines
Motor Start-up
Plastic Injection Molding
Harbor Cranes
Electric Trains
Wind Energy




Low voltage systems:
220 V - 690 V
50 or 60 Hz

Single phase or three-phase
Medium voltage systems:
up to 69 kV
50 or 60Hz

Ambient Temperature:
+ 40oC: max (< 8 hours)
+ 35oC: max 24 hr
+ 20oC: yearly average
- 10oC: minimum

Low loss, self healing
IEC 831-1/2

Protection class:
IP 20 / NEMA 1 (Other on request)

Controller Display:
5” Graphic LCD
160*128 pixels
High visibility (FSTN)
Durable LED Backlight

Steel sheet cabinet

Enclosure Finish:
Epoxy powder coated
Gray (RAL 7032)

Internal parts:
EMC Standards:
EN 50081-2, EN 50082-2
EN 55011,
EN 61000-4-2/3/4/5,
ENV 50204, ENV 50141

Safety Standards:
EN 61010-1,
EN 60439-1
UL 508 (on request)


Copyright 2008 Bao Tan Co.,Ltd All rights reserved 
Designed & Developed by
Lam Thanh Danh - Bao Tan Co.,Ltd