VPO Technical Overview | Kroll Enviro
Kroll Enviro offers a range of products designed to minimise environmental impact and provide new and innovative ways to deliver substantial savings for businesses.
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How does Voltage Power Optimisation work?

Electrical networks normally supply electricity at a higher voltage than required by most customers. In Australia, statutory supply range is 230V, +10% to -6%, a range of between 253V and 216V. As the electricity has to travel long distances across the grid, it is typically supplied at the high end of the range.


Incoming voltage – typically around 242V – is brought to the optimum operating level for most equipment at around 220V. By correcting these over-voltage conditions equipment downstream will consume less energy. In motors, for example, over+voltage drives the core into saturation, which wastes energy as heat. The optimiser corrects this with up to 99.94% efficiency or better, so the resulting savings are not significantly offset by energy loss in the unit itself.


Balance across the three phase voltages is improved by the regulating effect of the optimisers star-connected secondary windings. Improvements in phase balancing of over 20% have been observed, which dramatically increases the efficiency of 3+phase AC motor equipment, common in air distribution systems, resulting in less noise and vibration.


Harmonic filtration is integrated into the design of the VPO, giving an attenuation in Total Harmonic Distortion (THD). As harmonics are potentially damaging to electronic equipment. and known to reduce the efficiency of HV transformers, this is an important function that delivers tangible energy saving benefits.


As a result of the power conditioning benefits, a typical VPO installation improves the Power Factor of your site by between 5% and 10%. This may alleviate the need for additional Power Factor Correction (PFC), although the VPO is fully compatible with this type of equipment. Considerable reductions in reactive power have been achieved, reducing penalty charges from electricity suppliers.


The VPO will protect a site from common transients, which can have a devastating effect on sensitive electronic equipment. The number of transients is likely to rise due to increased switching on the supply network, so our units provide a vital defence for your electrical systems.

A 230v linear appliance used on a 240v supply will take 4.3% more current and will consume almost 9% more energy and only achieve 55% of it's rated life

Benefits and impact of Voltage Power Optimisation

Voltage optimisation is commonly recognised as a proven, cost-effective and reliable way for companies to meet their energy and carbon dioxide reduction targets.


In light of various schemes being implemented to help raise environmental awareness and encourage changes in behaviour and infrastructure in organisations, the implementation of a voltage optimisation system enables companies to be proactive in taking steps to improve energy efficiency and reduce carbon emissions.


There are various types of equipment that are misleadingly touted as voltage optimisation technology, so beware. Installing the right type of system is essential to ensure that electrical equipment never receives more or less than the required minimum voltage for correct operation – important during power dips and surges.


By opting for a true voltage optimisation solution, companies will find their equipment will operate as efficiently as possible at all times, the lifetime of equipment will be maximised and maintenance costs will be significantly reduced.


Ultimately, if your company’s power is not optimised, you are paying much more for electricity than you need to and, at the same time, emitting excessive amounts of carbon dioxide. As voltage optimisation is one of the simplest and most cost-effective ways to reduce electricity use and cut carbon emissions, it should be regarded by all organisations as the cornerstone of their energy efficiency agendas.

Electrical energy savings

Hundreds of sites across Australia and New Zealand have installed VPO. Average savings on a typical building are 11% of your electricity spend.

Reduces harmonics

The VPO is able to deliver significant reductions to the third, fifth and seventh order harmonics. It reduces the currents flowing on the neutral by attenuating triple-n harmonics, and helps to balance the three phases supplied to your site.

Improvement of Power Factor

Improvements in Power Factor between 5 - 10% are immediately identifiable due to the ability of the VPO to reduce reactive power.

Protection against transients

VPO will protect a site from all common transients. These voltage spikes can have a devastating effect on sensitive electronic equipment. Transients are becoming more common as we move towards a more sustainable electricity network with more disrupted generation.