New quality standards in power supply

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Organisations today can generally be at considerable degree of risk from incidents involving power supply inefficiencies that can jeopardise the integrity of critical loads and the continuity of business processes.

Typical of these incidents is the growing issue  of harmonic currents, which are anomalies generated by servers, PCs, static converters and other loads that, absorbing power in non linear mode, distort the normal sinusoidal curve of current and also reflect on voltage. Harmonic noise has several negative effects, in particular causing device overheating, interference with sensitive equipment, unexpected opening of differential switches, and oversizing of power connections.

Liebert AF, the active filter designed by Emerson Network Power, responds effectively to this problem. Applied to non-linear loads, this converter measures and eliminates harmonic distortions, preventing their transmission through the network. Elimination is achieved by generating harmonics with the same amplitude but opposite in phase, resulting in a stable and clean sinusoidal current.

The level of correction required by the distribution system is calculated according to two parameters, namely the total harmonic distortion of current or THDI, and the power factor. Located between the UPS and the source, for example a transformer or generator, Liebert AF reduces THDI significantly, bringing it down below 4% and stabilizing it independently of the load. Whilst reducing the quantity of energy transmitted to the mains network, this solution also compensates the reactive power of non-linear loads and improves the power factor, allowing a small generator to be used for the same application. The result is lower consumption and costs, and higher efficiency of the distribution system.

Easy and quick to install, up to six modules can be connected in parallel. The Liebert AF can be combined with passive filters and is compatible with Lieberts monitoring products.

About Emerson Network Power
Emerson Network Power, a business of Emerson (NYSE:EMR), is a global leader in enabling Business-Critical Continuity from grid to chip for telecommunication networks, data centers, health care and industrial facilities. Emerson Network Power provides innovative solutions and expertise in areas including AC and DC power and precision cooling systems, embedded computing and power, integrated racks and enclosures, power switching and controls, monitoring, and connectivity. All solutions are supported globally by local Emerson Network Power service technicians.

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