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Filters solve harmonics problems

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THE new, three-phase MTE MATRIX filters from Westek Electronics are designed to provide efficient suppression of harmonics for a large range of equipment including variable torque, frequency drives, servo drives, UPS systems, electronic welders, fan and pump drives, elevator drives and induction furnaces.

Two basic filter types are available: the MATRIX M5 series designed for applications requiring the equivalent of 18-pulse inverter performance, typically achieving a THID of 5% at full load; and the MATRIX M8 series with a THID of 8% at full load and suited to the harmonic performance of 12-pulse drives.

The M5 and M8 filters provide good harmonic suppression compared to the performance of respectively 18-pulse and 12-pulse inverters. Unbalanced three-phase circuits normally exacerbate harmonics but the M5 and M8 filters suppress harmonics in these cases, obviating the need to redistribute loads on the phases.

Both filter series are suitable for operation with six-pulse drives which are common in industrial electronics equipment.

The MATRIX filters are also a good solution to fifth harmonic traps. For example such a trap with a 5% impedance typically provides a THID of only 20%.

The MATRIX filters are appropriate for reticulation systems employing capacitive power factor correction by preventing resonance. They are designed to minimise the “importation” of external harmonics to downstream loads and because of their effective harmonics suppression, maximise the load capacity of upstream transformers.

The MATRIX filters may be used with diode, SCR an IGBT systems and in conjunction with internal impedances such as line reactors or dc bus chokes.

The M5 and M8 filters are available as 380V to 415V ±10%, three-phase configurations with load currents selectable from 6A to 786A. The MATRIX filters may be paralleled to provide for larger loads.

Various enclosure options are available including open construction versions suitable for integration in customer panels and enclosures.

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