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   Best power quality solutions

The EQUALIZER is an ideal solution for power quality applications. Regardless of the application, the EQUALIZER solution achieves near perfect power factor control, network stabilization and energy savings.

Capacitor Group Switching

The EQUALIZER switches capacitor groups on and off using state of the art electronic switches. The connection and disconnection of capacitors occur precisely at zero current crossing. This smooth connection avoids transient effects typically created by electromechanically switched power factor correction (PFC) systems, extending the life expectancy of the EQUALIZER dramatically.




The EQUALIZER is equipped with a unique SCAN feature that protects capacitors from exploding and contributes to longer life expectancy by reducing over-current and minimizing capacitor heating. The electronic switching element (unlimited operations) connects one capacitor group simultaneously as another group is disconnected. This operation occurs every few seconds, engaging each capacitor group in turn, with total compensation unchanged. This results in mean current reduction due to lower duty cycle (engagement time to cycle time). Together with the unique reactor design, temperature rise of the reactors is substantially reduced and the potential for cabinet overheating is minimized.


Fast and Accurate Measurements

The EQUALIZER controller uses FFT (Fast Fourier Transform) analysis of all phases each cycle. Power information, system status and detailed logs of events are displayed on a large backlit graphic LCD screen, or via communication using the user-friendly PowerIQ software.

Harmonics Filtration

Harmonics pollution increasingly becomes a dominant power quality 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 middle 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 by more than 70% (8.8% to 2.5%) and the dominant harmonics (5th and 11th) were reduced by 75%.

Tuned Equalizer 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 Equalizer is the preferred choice, both technically and economically, effectively minimizing system losses and reducing the Total Harmonic Distortion (THD).


Ideal PFC Control

Using exclusive automatic control algorithms and rapid electronic switching, total acquisition time (complete compensation of reactive current) is achieved in 2/3 cycle typical (50Hz = 13.3 ms; 60Hz = 11.1 ms), irrespective of the number of steps required. The power factor is controlled very accurately through an advanced open and closed-loop control & measuring system that uses information from all three phases, as well as accounts for the effect of harmonics (1 through 63). Minimum, maximum and average power factor modes, as well as threshold levels, can be selected for perfect compliance with specific network requirements. The EQUALIZER includes a unique solution for line-to-line loads, in which it calculates a transformer’s internal currents and compensates accordingly. Third party measurements have proven the EQUALIZER to be the ultimate solution to offer precise compensation for voltage drop and flickering. 

Voltage Control

In addition to power factor and other power quality issues, at times there is a need to maintain voltage levels within certain limits due to sensitive equipment or other facility requirements. The EQUALIZER voltage control option offers 6 different voltage control levels that facilitate both high and low parameters. The voltage control operates in parallel with the power factor control and complements it.


The Elspec EQUALIZER is successfully installed in thousands of sites with other applications that due to space limitation were not described in this catalog. The EQUALIZER can benefit all users, regardless of their specific application, to save energy, improve power quality, filter harmonics, prevent voltage drops and much more.



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Lam Thanh Danh - Bao Tan Co.,Ltd