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This winding is in series with the site’s power supply and carries the load current on each phase. It is constructed from heavy-gauge copper sheets, with very few turns, meaning that the unit has very low impedance and very low losses. This winding acts to filter harmonics and protects the site from common transient events.
The interaction between the primary and secondary winding on each phase acts to reduce the voltage by a fixed percentage. For example, if V in is around 240V, V out will be 220.8V, assuming an 8% optimisation setting. Each powerPerfector unit has four optimisation settings and a 0% setting.
An example of a typical optimisation setting range is -5%, -6%, -7%, -8% and a 0%.
The connection between each phase has a current flowing that is in direct proportion to the difference between the three phase voltages. This connection forms an unreferenced star point on the secondary side. In this way, the powerPerfector is able to compensate for imbalanced phase voltages without recourse to active (electronic or mechanical) components.
These are connected as a closed ‘delta’ configuration. The purpose of the closed loop is to provide a path to circulate and dissipate harmonic currents present on the incoming supply, thus attenuating and preventing them from circulating into the downstream load. This winding has the same effect on harmonic currents that are generated downstream of the powerPerfector unit, preventing harmonic currents that are generated on site from circulating into the upstream load.