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H.F. System for Offices
Office buildings have undergone a significant modernization during the last years Large quantities of computer equipment (personal computer, printer, network servers) have been incorporated. All these equipment generate elevated levels of harmonics, which cause important problems in the electrical installation and the computer equipment itself. The triple harmonics (3rd, 9th) are especially harmful as these sum in the neutral conductor and generate a high neutral current causing serious failures and damages in the installation.

NAAC has developed a series of electromagnetic filters for elimination of harmonics named 'Compensator'. These equipments are based on the cancellation and compensation of magnetic fluxes. The main advantage of the compensator is the absence of electronic components and capacitors. The compensator are therefore maintenance free, have an extremely long lifetime compared with other types of filters and are compatible with any electrical installation.

Problems:

• Malfunctioning and failure in computer equipment.
• Overheating of neutral conductors.
• Low efficiency and overheating of UPS, transformers and cables of the installation.
• Tripping of protections without apparent reason.
• Interferences in communication networks.
• Incremented power consumption.

Causes:

• Low quaility electrical energy. Elevated harmonic distortion in the voltage.
• Elevated neutral - earth voltage.
• High harmonic distortion in the current.
• Excessive levels of 3rd and 9th harmonics in the neutral conductor.
  
• Elevated true RMS current in the phases.
• Low power factor due to harmonics.
• Elevated losses in the electrical installation.
  

Harmonic Compensator H30F
The H30F series Compensator achives the highest level of filtering in office installation. It eliminated the 3rd, 5th, 7th, 9th, 15th, 17th and 19th harmonic avoiding therefore all  possible problems that harmonics can cause in the installation. The H30F is also suitable for installations where due to standards and legislations a high level of filtering is required. It provides additional advantage such as reduction of electromagnetic distrubances coming from the mains, optional voltage adaptation between input and output and the possibility to use independent earths as the neutral is isolated from the mains.

The H30F compensator consists of two secondary windings. Each secondary should supply 50% of the total load to be filtered. The filtered harmonics and compensated in the secondary windings and do not circulated through the rest of the installation.