Zero-sequence harmonic filter

29 October 2008 Circuit & System Protection

APC has extended its range of equipment to improve power quality with the introduction of MGE CleanWave, a filter which reduces zero-sequence harmonics in the neutral line.

Increased non-linear loads on power systems create harmonics that affect all mains-powered equipment and interfere with their operation. Excessive harmonics make it impossible to comply with EMC standards and can cause equipment to overheat, which damages insulation, may cause fires and reduces the efficiency of electrical devices. They increase the distortion of the voltage, which in turn can degrade or damage electrical equipment, disturb the operation of sensitive applications, cause electronic equipment to trip out and displays and lighting to flicker, amongst other problems. They also increase electricity consumption.

With an architecture based on isolating the zero-sequence harmonic current downstream the LV installation, close to the non-linear loads, CleanWave attenuates, by a ratio of 10:1, zero sequence harmonic current in the neutral, thus preventing the harmonics being carried back into the mains. It also re-balances the current in the phases and improves the power factor, reducing current consumption, as well as reducing electromagnetic interference.

CleanWave technology does not use capacitors, and has high reliability com-parable to a dry type transformer. The system can be installed without a preliminary study and can be easily sized. It can be connected in parallel to provide a redundant solution or increase power.

The system is available in 10 models, from 12 kVA to 280 kVA (from 29 A to 722 A neutral current). These models come in the form of an IP00 chassis for integration into a customer’s own enclosure, or in an IP21 enclosure with meters.

For more information contact APC, 0861 272 877.

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