Legend Power Systems Inc.

The Electrical Harmonizer—Automatic Voltage Regulator is an on-load automatic electronic tap changer with a high efficiency autotransformer that regulates voltage to the optimal level.

There is an optimal minimum voltage level below the primary level (600V CA, 480V US, 400V EU) where lights, motors, etc., will operate comfortably with no effect on their practical performance. At 5% below the primary voltage (570V CA, 456V US, 380V EU) these loads are still within manufacturer’s specifications but will work with less waste heat, longer life, a lower carbon footprint and less energy. However, there are two factors preventing the power company from delivering the minimum optimal voltage to commercial and industrial facilities: line loss resistance and peak power. Power is distributed from a utility substation at a higher than necessary voltage level to ensure that the last building on the grid receives power above the minimal voltage level.

If a facility measured their incoming voltage and found that it was quite high, they could install a transformer that would step down the incoming voltage by a certain percentage. This “hard tap” transformer solution has been available for decades. However, if the grid power fluctuated down, the percentage reduction is “fixed” and the voltage can drop too low, causing a brown out.

Legend Power Systems provides a simple and effective technology solution that allows qualified commercial and industrial facilities to reduce their voltage to the optimal minimum in-spec level, without any worry about going too low when the power grid flctuates.

The Automatic Voltage Regulator continually monitors a facility’s incoming voltage level and automatically selects the correct tap setting on the autotransformer to ensure power is always entering the facility at an optimal level. If grid voltage levels drop below the minimum optimal, the system is immediately bypassed ensuring that the energy flow to your building is never negatively affected.