London May 2005 - MGE UPS SYSTEMS, a world leader in high availability power solutions, is extending its range of equipment to improve power quality with the introduction of CleanWave, a filter which significantly reduces zero sequence harmonics in the neutral.
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. Harmonics can cause equipment to overheat which damage insulation, may cause fires and reduce 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, etc. They also increase electricity consumption.
MGE UPS SYSTEMS is now introducing a zero sequence harmonic filter, CleanWave®, as an effective solution to this type of power supply disturbances. These high intensity harmonics (H3, H9, etc) have a particularly disturbing effect on three phase plus neutral distribution systems: they add up in the neutral conductor, which then carries considerable high frequency current and can quickly become overloaded.
Impressive reduction in harmonics and zero sequence current
With its innovative 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.
> re-balances the current in the phases
> improves the power factor, reducing current consumption.
> reduces electro-magnetic interference.
A simple, reliable solution
> CleanWave® technology does not use capacitors, then has an exceptionally high reliability, comparable to a dry type transformer.
> Cleanwave® 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.
Models
Cleanwave® is available in 10 models, from 12 kVA to 280 kVA (from 29 A to 722 A neutral current).
These models come in two versions: in the form of a chassis, IP00, for integration into the customer's own enclosure and in an IP21 enclosure with meters.
Applications
Office buildings with IT equipment, lighting, monitoring systems, Commercial buildings such as shopping centres, supermarkets.
Find out more about harmonics
> MGE white paper on
http://www.mgeups.com/techinfo/techpap/tpapers.htm
> THM filtering and management of harmonics upstream of the UPS
> Compensating harmonic current generated by computers, utilizing an innovative active harmonic conditioner.
> LPQI, Leonardo Power Quality Initiative: www.lpqi.org