Power filters

The Ablerex Enersine ESD34 series of active power filters is modular, allowing maximum harmonic current compensation to 960 A per phase, from a minimum of 30 A. The filters are suitable for operation in LV three-phase 50 or 60 Hz networks and harmonics attenuation factors are typically 20 dB or greater.

The filters are suitable for three-phase, 3- and 4-wire reticulation. They can compensate for triple harmonics and unbalanced harmonics flowing in the neutral conductor. Neutral current compensation is possible from a minimum of 90 to 2900 A.

The filters compensate for even and odd harmonics to the 51st order. Up to 12 harmonics can be programmed for compensation, allowing tailoring of the harmonics compensation task to specific applications.

The filters are also responsive, adapting the compensation pattern within two cycles, making them suitable for compensating dynamic loads, for compensating inrush current and for power factor improvement in the range of 0.7 lagging to 0.7 leading.

They are available as rack- or wall-mounted units. Up to four modules can be placed into the mainframe, which also contains the control unit. The individual power modules operate in parallel and up to eight, in total, mainframes, each with its control module, can be placed in parallel. Individual harmonic power units can compensate for 30 A per phase and 90 A per neutral.

The filters have easy-to-use control panels, indicating the status of individual modules including alarm conditions. An optional control panel also provides graphical display of harmonics being compensated in barograph format as well as THD, PF, voltage, current and kVA. Standard communication ports include serial RS232 interfaces and a USB port in addition to dry relay contacts.

Optional interfaces include RS485/422 and an ethernet card. A Windows-based software package, ESD-Link34, is available providing parameters control as well as waveform and harmonic spectrum information.