Active power filter

The smart power conditioner, model SPC from PQ Tech, is an active harmonic filter series suitable for single-phase sub-distribution circuits in commercial buildings, shopping and entertainment centres, small industrial enterprises, etc.

Using digital signal processing, it monitors harmonic current injected by non-linear loads such as SMPS systems, IT equipment, electronic fluorescent lighting ballasts, etc, and generates anti-phase current so that incoming power lines only carry the clean sinusoidal current required for the attached kilowatt load.

The conditioners is the series as single-phase devices, are suitable for phase to neutral voltages from 120 to 400 and are available in line current ratings from 30 to 300 A.

Installation is simple as they are connected in parallel with the load. Smaller units can be used for individual loads, such as towers, whereas the 300 A models are also suitable for connection at sub-distribution board level.

For larger power applications, units can be paralleled.

In three-phase, 4-wire systems, three conditioners can be connected between the individual phases and neutral, eliminating the 150 Hz triplen harmonic, which can severely overload the neutral.