Test Data

Phaseback is NOT a high resistance-grounding unit; it fights against high resistance grounds, high impedance grounds, inductive grounds and capacitive grounds on any phase that may cause a phase voltage imbalance.

In a 480 volt ungrounded power system the input voltage selection would be set for 480 volts. The phase voltages would be 480 / 1.732 or 277 volts. With all phase voltages balanced Phaseback uses virtually no energy.

As the power system develops a high resistance ground on any phase anywhere on the power distribution system, Phaseback will fight this imbalance by redirecting energy from the phases with higher voltage and feed it back into the low voltage phase pulling the voltages back into balance.

In a balanced 3 phase ungrounded 480-volt power system the phase voltages are 120 degrees phase shifted from each other. As insulation breakdown starts forming, this phase relationship starts to be destroyed and the phases become noisy and distorted. Phaseback restores this 120-degree relationship between the phases and balances this voltage while retaining the system charge energy. Phaseback can generally balance phase voltages in an ungrounded 2000kva power system with hundreds of feet of power cable and bus duct, filter out voltage spikes and phase harmonics, safely convert this noise energy to heat and do all this while using less than 50 watts.

The energy flow is into the Phaseback from the high voltage phases, through the inductively coupled energy transfer modules. The noise energy, transients, spikes, phase harmonics etc. is filtered out and safely converted to heat, then the remaining energy transferred is phase shifted to combine this energy to feed it back through the inductively coupled energy transfer modules to provide high power factor counter EMF to pull up the low voltage phase.

This energy transfer through the inductively coupled energy transfer modules through the noise filter module, back through the inductively coupled energy transfer modules to raise the low voltage phase happens at the speed of the current flow. Phaseback had no built in time delay, reaction or response time. Phaseback does not attempt to control the speed of current, it balances phase voltages. This works automatically, continuously and effectively even with a problem on multiple phases.

For example: If insulation breakdown occurs on the Y-phase causing the voltage to start to have an imbalance, the X-phase voltage leads the Y-phase voltage by 120 degrees, transfers it’s energy through the inductively coupled energy transfer modules, noise energy is filtered out, the energy is phase shifted 90 degrees (120 – 30) to align itself with the energy from the Y-phase. The Z-phase voltage lags the Y-phase voltage by 120 degrees so the Z-phase energy is phase shifted -150 degrees [(-120 + -30)] to align it with the Y-phase. This combined energy is then phase shifted again through the inductively coupled energy transfer module. This high power factor energy (the energy phase angle is now in phase with the Y-phase voltage) feeds back raising the Y-phase voltage.

Phaseback works like a voltage pull down circuit to high phase voltages and a pull up circuit to low phase voltages while filtering noise. Phaseback continues to monitor phase voltages, filter noise and balance phase voltages as it is always online even during a direct short to ground.

Waveforms

 

Total Harmonic Distortion feeding a VFD

Total Harmonic Distortion feeding a VFD to Motor with Silencer ON