1000FT FROM DRIVE TO MOTOR - DVS removed the spikes & harmonics!
Peak voltage Chart- DVS on/off/on shows change 635V to 376V B phase
Crest Factor Chart- DVS on/off/on shows change 2.18 to 1.16 B ph
RMS Voltage Chart- on/off/on shows change 288V to 322V on phase B
The case study follows:
200 hp 480 volt 3-phase motor connected to the secondary of an 18-pulse siemens Robicon AC VFD with a phaseback Drive Voltage Stabilizer connected to the motor power cable terminals.
Test basis:
67% reference speed, 40.2 hertz,
184 amps on the output of the drive Crest Factor Chart shows 2.18 to 1.16
Results from the test: The PHASEBACK DVS
Efficiently reduced the peak ac voltage
From 630 volts to 372 volts - Without other devices, such as reactors, Filters, Active Front End, TVSS, SPDs, Isolation Transformers, etc.
The transient voltages were prevented / eliminated by PHASEBACK DVS
36,000 Transients per second from IGBT to motor were eliminated
Efficiently reduced the voltage crest factor
By 45%. From 2.12 to 1.16. Without other devices.
Reduced by the harmonic reduction properties of PHASEBACK DVS
Improved the RMS Voltage
By 8%. Without other devices.
From 297.07V to 320.5V Average
Summary:
With lower peak voltage and reduced harmonics, the motor runs cooler and does not have to work as hard. This causes less wasted power and less voltage drop, allowing an improvement in RMS (effective voltage), power factor, kvar and kva.
Electric motors running cooler
7.5°C reduction in heat
Motor life is doubled.
Phaseback DVS removes the transients
IGBT drives typically have 36000 Transients per second.
This will typically equate to approximately 1 TO 2 YEAR PAYBACK.
We offer an excel spreadsheet for calculating actual payback based on your horsepower, annual run time hours, energy cost and other factors. Download XL file
Reference: Jon Bickel, Square D / Schneider Electric—Plant Engineering 6/1/2006 download 21pg pdf
for a quote on Phaseback DVS, Phaseback VSGR, or Phaseback Harmonic Silencer
Cy Cates cycates@cycates.com http://www.cycates.com 832 647 4606 cell www.phaseback.com
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