The document describes the Electrical Harmonizer – Automatic Voltage Regulator, which optimizes voltage levels in commercial and industrial facilities, reducing energy costs and greenhouse gas emissions by up to 12%. It features a high-efficiency transformer that maintains optimal voltage for electrical equipment, minimizing waste heat and extending their lifespan. The system provides measurement and verification with an accuracy of ±4% while offering automatic bypass to prevent brownouts during grid fluctuations.

1. the electrical harmonizer–automatic Voltage Regulator
• Reduced energy cost, consumption & Peak Power by up to 12% • Reduced greenhouse gas emissions
• increase life expectancy of electrical equipment • measurement & Verification with an accuracy
of ±4% 95% of the time
abouT The Technology
the electrical harmonizer–automatic optimal voltage to commercial and Legend Power systems provides a simple
Voltage Regulator is an on-load automatic industrial facilities: line loss resistance and and effective technology solution that
electronic tap changer with a high efficiency peak power. Power is distributed from a allows qualified commercial and industrial
autotransformer that regulates voltage to utility substation at a higher than necessary facilities to reduce their voltage to the
the optimal level. voltage level to ensure that the last building optimal minimum in-spec level, without
on the grid receives power above the any worry about going too low when the
there is an optimal minimum voltage level minimal voltage level. power grid fluctuates.
below the primary level (600V CA, 480V US,
400V EU) where lights, motors, etc, will if a facility measured their incoming the automatic Voltage Regulator
operate comfortably with no effect on their voltage and found that it was quite high, continually monitors a facility’s incoming
practical performance. at 5% below the they could install a transformer that voltage level and automatically selects the
primary voltage (570V CA, 456V US, would step down the incoming voltage correct tap setting on the autotransformer
380V eU) these loads are still within by a certain percentage. this “hard tap” to ensure power is always entering the
manufacturer’s specifications but will work transformer solution has been available facility at an optimal level. if grid voltage
with less waste heat, longer life, a lower for decades. however, if the grid power levels drop below the minimum optimal,
carbon foot print and less energy. however, fluctuated down, the percentage reduction the system is immediately bypassed
there are two factors preventing the power is “fixed” and the voltage can drop too low, ensuring that the energy flow to your
company from delivering the minimum causing a brown out. building is never negatively affected.
The Problem – Line Loss Resistance & Peak PoweR
871 kW 851 kW 830 kW 809 kW 788 kW
CA 630 V 615 V 600 V 585 V 570 V
Power SubSTaTion US 504 V 492 V 480 V 468 V 456 V
EU 420 V 410 V 400 V 390 V 380 V
The SoluTion – VoLtage oPtimization with an inteLLigent tRansfoRmeR
826 kW 795 kW 788 kW 788 kW 788 kW
CA 590 V 575 V 570 V 570 V 570 V
US 470 V 460 V 456 V 456 V 456 V
Power SubSTaTion
EU 395 V 385 V 380 V 380 V 380 V

2. ProducT SPecificaTion SheeT
PRodUct nUmbeR 400 500 600 700 800 900 1000
maximum Primary Voltage options 600, 480, 400*
frequency (hz) options 60, 50*
taps –2% –4% –6%
automatic bypass (0%) Yes
tap change method zero crossing, on-Load, fully automatic, Processor controlled, electronic
thd (v) on tap change <0.5%
thd (current) on tap change <2.0%
efficiency 99.89%
ambient temperature 0°c to 40°c – relative humidity 0 – 95%
cooling method convection
system configuration 3 phase, 4 wire input/output
switching speed (msec) <100
Repetitive full Range tap changing interval (sec) 30
non Repetitive tap changing interval (sec) 10
coil construction form
insulation class 180 (h)
installation methods floor mount, ceiling mount, seismic frame, split module
maximum system Load current Rating (amps) 400* 500 600* 700* 800 900* 1000*
harmonizer current Rating (amps) 400, 300* 400 500 750 750 750 750, 1000*
system / breaker current (amps) 400 500 600 700 800 900 1000
Reg coil Ω @ 25°c / 6% 0.105 0.094 0.084 0.049 0.049 0.049 0.032
% impedance @ 115°c 0.16 0.16 0.17 0.18 0.18 0.18 0.22
temp rise @ full Load 38 38 39 42 42 42 43
mechanicaL (approximate – will vary with installation configuration)
weight (kg/lbs) 355/783 355/783 380/838 604/1332 604/1332 604/1332 604/1332,
702*/1548
width (mm/in) 813/32 813/32 813/32 813/32 813/32 813/32 813/32
depth (mm/in) 660/26 660/26 660/26 660/26 660/26 660/26 660/26
height (mm/in) 915/36 915/36 915/36 1219/48 1219/48 1219/48 1219/48
harmonizer – aVR is classified as industrial control equipment UL 508.
component certification is under UL 1561 Us standards, and c22.2 no 47, canadian standards. UL file number e228073.
*available in 400V 50hz
Single line diagram RATED AT 800A CONT.
600/347V MAIN DISTRIBUTION PANEL
UTILITY PAD MOUNT HVAC & FANS
TRANSFORMER LEGEND POWER
MAIN SW. UTILITY 400A
HARMONIZER
F DISCONNECT METERING C/B
LIGHTING 208V
WAREHOUSE & DISTRIBUTION PANEL
800 AMP WORKSHOP
800A 800A 200A
M
ELEVATOR
AVR SPARE
UTILITY FEED
LIGHTING
347 / 600 V (CA)
277 / 480 V (US)
600A
230 / 400 V (EU) 300 KVA
208/120V POWER
TRANSFORMER
LIFE
otheR instaLLation sPLice/cUt-in Locations aRe aVaiLabLe
SYSTEMS
TRANSFER SW
EMERGENCY GEN
legend power systems inc.
www.legendpower.com electrical energy conservation