Automatic Voltage Equalizer | Active UNITS 

Voltage Balancing | Surge Suppression |  Active Harmonic Filter | VAR Compensation


Low, Medium & High Voltage Systems

“ Solutions for energy efficient and reliable power distribution systems. “


EM Energy Solution with great Success in South Korea

EM Energy Solution with great Success in South Korea

Recently we had several installations of our units at different locations in South Korea. The results and feedback have been amazing. We have proven our units unique capabilities in terms of energy reduction, improved equipment performance and a much more reliable...

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Neonent factory South Korea

Neonent factory South Korea

This week we installed our units at Neonent Factory in South Korea. Neonent is a major supplier for parts to the automobile industry with many of the biggest car manufacturers as their main customers. The factory has very advanced production with a lot of automation...

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Check out our 2020 product brochure!

Check out our 2020 product brochure!

Read more about our revolutionary technology and how to optimize your electrical system to save energy, increase safety and maximize production output. Updated with our latest units and models. See the brochure here (PDF)

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EM-ENERGY SOLUTIONS designs products for increased power quality and energy optimization in electrical distribution systems. Our new revolutionary patented AVE technology, together with our state-of-the-art harmonic filters and VAr compensator solutions, will lower overall costs in terms of reduced downtime, energy consumption, and emissions along with extended lifetime on electrical equipment and increased personnel safety.

The AVE series, harmonic filters, and VAR compensators can be scaled to fit all conventional distribution systems. Installation is simple; equipment connects in parallel on the supply transformer secondary side and protects all downstream equipment against transients, harmonic distortion, voltage unbalance, unbalanced voltage sags, arc-flash, and improves power factor.

Benefits of AVE 


AVE  Benefits:

  • Prevents phase voltage imbalance
  • Prevent phase angle differential
  • Eliminate transients and voltage spikes (lightning strikes)
  • Prevent Arc flash
  •  Prevent phase voltage instability
  • Reduce voltage harmonics (Phase – Ground)
  • Reduce waveform distortion
  • Eliminate noisy ground reference and frequency instability
  • Prevent arcing ground faults
  • Provides a good and stable ground reference for power system stability to ensure optimal operation of control systems without interruption.

  • Increased operational efficiency
  • Reduced energy consumpion
  • Extended lifespan of electrical componets and machines
  • Reduced  dangers of arc flash and ground faults.
  • Reduced CO2 emissions
  • Reduced maintenace and downtime
  • Saved cost
  • Increased safety for personnel
  • Advanced Power Quality Analyzer, including webserver, HMI-panel and energy management software.
  • Alarms are given for various events like ground faults, transients, voltage imbalance, high harmonic distortions etc

Industry Challenge

Today’s use of electronics and power electronics are setting higher demands to power quality. The industry is experiencing considerable costs in terms of increased power bills, reduced operational lifetime, and damage to electrical equipment. Many of these problems are related to the harmonic distortion created by the increased use of power electronics, transient voltage surges, and unbalanced voltage dips caused by uneven phase loads.

Voltage imbalance is a large and expensive problem in the industry. Electric motors will operate at higher temperatures and lower efficiency, which results in significantly reduced life expectancy and increased power consumption. For electrical equipment, a rule of thumb is that an average temperature increase of 10 degrees Celsius equals a 50% reduction in life expectancy.

Equipment failure and system lockup result in unreliable operation with downtime and production stop. Many industries run delicate processes that require a fully functional production line. Production stop related to faulty equipment can significantly impact production output and, subsequently, a company’s earnings.

Another high potential industry hazard is Arc-Flash. Arc-Flash is one of the most dangerous incidents for both personnel and equipment. It is an electrical explosion/discharge that results from a low-impedance connection through the air to ground or another high voltage phase in the electrical system. It may also be initiated through accidental contact, underrated equipment compared to available short circuit current, contaminated insulated surfaces, as well as other causes.

An arc-Flash event can dissipate large amounts of deadly energy in form of shock wave and superheated metal plasma. Temperatures can reach as high as 19 000 degrees Celsius, even hotter than the surface of the sun.
This kind of energy can set fire to clothing and severely burn human skin in fractions of a second. According to Industrial Safety and Hygiene News report, there is, on average 30 000 Arc-Flash incidents every year with an estimated 7000 burn injuries, 2000 hospitalizations, and 400 fatalities.




The AVE series is designed for balancing phase voltages with respect to ground and mitigating transient events to a non-damaging level. Any kind of voltage imbalance on a system will be detected, and the unit will redirect the energy from the high voltage phases to the low voltage phase. The AVE suppresses transient voltage spikes without degradation of itself and does not allow the installation to be exposed to voltages several times the nominal rating. If the voltage is controlled, there is no force behind the current to push it into damaging levels. Due to this, AVE also increases the installations safety factor by reducing the risk of electric shock, arc-flash, and potential fire.

Active units:

Our active filter units are designed to mitigate harmonic current distortion and subsequent voltage harmonics, by real-time modulation and of the measured harmonic current distortion. By injecting the same harmonic current measured in the distribution system 180 degrees phase-shifted, it will cancel out both current and voltage harmonics.

Our VAr compensating units will ensure optimal power factor. And will compensate for both leading or lagging power factor, and provide a power factor ≈1. Conventional solutions based on capacitor technology are to slow for many of the fast consuming reactive loads and are not able to follow the reactive power demand, which leads to under and overcompensation of reactive power. Our 3-level IGBT topology technology allows for real-time response, preventing any under or overcompensation.   

The active units come in a variety of combinations and can have both VAr compensation and Harmonic current compensation in the same unit. By assessing the plant’s power quality situation, the solution can be tailor-made, to provide the most cost-effective solution. We also offer solutions for energy backup, enabling plants to ride through momentary or long term power outages.

To summarize, our technology serves as a surge suppressor, voltage regulator, load balancer, and harmonic filter. It is easy to install and connect in parallel on the transformer secondary side. It will protect all downstream equipment, thus making other power quality technology, such as MOV based devices unnecessary and obsolete. By having our units installed, the result will be substantial cost savings and increased electrical safety.

The screenshot above is taken from Neonent ltd car parts factory in South Korea AND clearly shows the AVE`s unique capability to reduce energy consumption. The average daily energy consumption without AVE active is 4201.3 kWh compared to 3918.85 kWh with the AVE active an average saving of 282.45 kWh per day!  The yearly saving will add to more than 90 000 kWh  (6 days working week).  With AVE, customers save energy, increase revenue, productivity, and meet regulators grid connection criteria

Energy log above shows the massive difference in reactive energy consumption with and without the AVE active. The AVE is reducing reactive energy by almost 50%. Reactive Power creates an extra load on the installation, equipment, and transport infrastructure (such as cables). Reactive power can arise in the external network and the local network and may be caused by the energy supplier as well as the end-user. In this case, the vast amount of harmonic distortion leads to extra reactive power consumption. Reactive power has a negative effect on efficiency and capacity and introduces unnecessary (energy) losses and costs.

The Waveform log above is captured by EMES PQA during welding machine operation at Samsung Heavy Industries and shows the exact moment when AVE is activated. The Waveform before the AVE activation is distorted with a high voltage unbalance (8-9%). After AVE activation, we see a short transitional period of 30-40ms where the unit stabilizes the system, removes harmonic distortion, eliminates transients, and reduces voltage unbalance (0.5%).  After the AVE is activated, we can see a perfect sinus waveform and a 100% balanced system.

Existing semiconductor-based surge protection devices are too slow and often allow as much as five times nominal voltage into the system. These transients will drastically shorten the lifetime of control system,  electronics or any other semiconductor-based equipment. The AVE reacts with the speed of the current and does not allow any significant increase in the voltage. During laboratory testing, the AVE mitigated a charge of 10 000 Volts to a spike of only 28 Volt!

Above you can see a simplified schematic of AVE’s main circuit. The variable transformers are connected in star configuration on primary side with neutral connected to ground reference, while secondary side of the variable transformers are connected in series with a non-inductive stainless-steel grid resistor. The schematic visualizes the current flow in the AVE during a ground fault. The working principle will also be the same for any other voltage imbalance related problem.

If we look at the phase vector display, we see that the voltages are perfectly 120 degrees offset during the fault. The supported phase (L3) is supported by the two phases via the variable transformer circuits secondary side. During the fault, all phase currents will be in phase making us able to use simple algebra to calculate the ground current. Energy is redirected from the healthy phases to the low voltage phase.