ABB has extended its PQF (Power Quality Filter) series of microprocessor controlled active filters with the launch of the PQFS compact wall-mounting unit designed to solve harmonic and neutral current related problems in commercial buildings and small industrial applications. The PQFS can be applied equally well with three-phase, three-wire or three-phase, four-wire systems, and is suitable for small to medium loads where the equipment is connected between line and neutral, line and line or a mix of these types.
An ability to balance load between line and neutral enables the PQFS to reduce even the fundamental frequency current in the neutral, normally present due to unbalanced loading between phases, as well as filtering the harmonic currents from the line and neutral conductors.
The PQFS offers all the standard features of the PQF range; including individual targeting of harmonics combined with curve setting functionality and closed loop control. Reactive power compensation enables the load power factor to be increased to the desired level, while balancing loads between phases helps to reduce the negative sequence current. Other features include dynamic low loss control system, a user interface with network analysis capability, Modbus communications and real time stamp of events.