Reduce Energy Consumption by Optimizing Voltage

Most plant engineers and facilities managers have heard of voltage optimization (VO), but few are aware that this technology has taken giant leaps forward in recent times. The following guide provides answers to the most commonly asked questions concerning Voltage Optimization.

What is VO?

VO is technology that offers the capability to optimise the incoming mains voltage, typically by reducing, but sometimes by increasing it.

Why use VO?

There are lots of reason to adopt VO. For instance, over-voltage consumes more energy, leading to higher bills, and increases carbon footprint. Furthermore, voltage peaks and troughs can damage plant equipment, prompting higher costs in terms of maintenance, repair or replacement.

Will there always be peaks and troughs?

Yes, in fact volatility is only set to increase as the maximum power availability from the Grid is reached, and as the Grid reacts to feed-in supplies from wind power, photovoltaic technologies and local generation, thus worsening power quality issues.

What’s the problem with basic VO?

Basic VO systems are based on simple step-down transformers which reduce the mains voltage by a fixed percentage, typically usually 4% or 6%. Though offering small savings, these old, fixed ratio style VO systems do not maximise the savings possible or resolve the problems caused by fluctuating voltages, which can damage sensitive electrical equipment. What’s more, conventional VO systems do not handle under-voltage very well. Here, the system will either deliver too low a voltage, resulting in serious on-site problems, or switch to bypass (to protect itself and the building’s supply), thus offering no savings whatsoever.

What is the latest VO technology?

Voltage optimisation plus regulation equipment, known as ES25, takes fluctuating incoming voltages and stabilises them to give a clean, consistent output voltage. This is usually set at the optimal 220V and ensures continuity of supply. The secret behind the success of ES25 is its unique ‘Low Loss Impedance’ technology, which maintains the outgoing voltage at the optimum level whatever the incoming mains voltage.

How does ES25 work?

ES25 controls the voltage via a multiple tap transformer, and no other system on the Thai market can offer this. The simple reality is that the Grid voltage fluctuates continuously and most sites will suffer from at least a 12V swing. Fluctuations in the incoming supply voltages limit the ability of basic fixed ration VO to deliver savings.


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  • Reduce Energy Consumption 30%
  • Extend Equipment Life 25%
  • Reduce Peak Demand 50%