Harmonic Filter SYSTEM
( For Office Building )

BACKGROUND
Office buildings have undergone a significant modernisation during the last years Large quantities of computer equipment (personal computer, printers, 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 triplen 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 'H.F. System'. These equipments are based on the cancellation and compensation of magnetic fluxes. The main advantage of the H.F. System is the absence of electronic components and capacitors. The H.F. System are therefore maintenance free, have an extremely long lifetime compared with other types of filters and are compatible with any electrical installation.


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

Solutions of H.F. System ( H10F and H20F )


The H20F series H.F. System provides a very good cost-filtring relation. It reduces the triplen harmonics (3rd, 9th, 15th), and eliminates this way the main problems in office installations, which are overloaded neutral conductors and a high neutral-earth voltage. Additionally a reduction of the remaining problems caused by harmonics is obtained. It is recommended to install the H20F always in combination with the impedance Adaptor H10F in order to obtain the most optimised filtering and functionality. 


H10F: 16A - 400A PHASE CURRENTS            H20F: 25A-630A NEUTRAL CURRENT
Reduction of the neutral current and neutral -earch voltage upto  75%
Reduction of phase currents up to  15%
Reduction of voltage and current distortion up to  45%
Obtain power factor up to  0.80

Includes thermal protection

 

Solutions of H.F. System ( H30F )


The H30F series H.F. System achieves the highest level of filtering in office installation. It eliminated the 3rd, 5th, 7th, 9th, 15th, 17th and 19th harmonic avoiding therefor 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 advantages such as : reduction of electromagnetic disturbances 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 H.F. System 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.


10 kVA - kVA

Reduction of the neutral current and neutral -earch voltage upto 90%
Reduction of phase currents up to 45%
Reduction of voltage and current distortion up to 85%
Obtain power factor up to 0.96

Galvanic isolation between input and output

 

Includes thermal protection

 

Harmonic Filter SYSTEM
( For Industries )

 
BACKGROUND
During the last years there has been a large modernisation of the industrial production processes and a fast evolution in power electronics, especially in the field of power converters such as variable speed drives for DC motors, frequency converters, UPS... All these equipments have a common characteristic which is the generation of harmonics currents that reduce the quality of the electrical energy.

NAAC completes its range of filtering inductors with a range of electromagnetic harmonic eliminating devices named H.F. System. The functioning of these devices is based on the cancellation and compensation of magnetic fluxes. The main advantage of the H.F. System in the absence of electronic components and capacitors. The H.F. System are therefor maintenance free, have an extremely long lifetime compared with other types of filters and are compatible with any electrical installation.


   PROBLEMS     CAUSES
  • Malfunctioning and failure in electronic equipment.
  • Overheating and failure in transformers and cables.
  • Overload and failure in capacitor banks.
  • Low efficiency of transformer and cables.
  • Tripping of protections without apparent reason.
  • Interferences in communication networks.
  • Low quality electrical energy. Elevated harmonic distortion in the voltage.
  • Notches and transients in the voltage caused by power converters.
  • Elevated harmonic distortion in the current.
  • Resonance in capacitor banks.
  • Elevated true RMS current in the phases.
  • Low power factor due to harmonics.
 

Solutions of LTN Line Inductors
The LTN series line inductors provide the most optimised cost-filtering relation of all solutions for harmonic filtering available in the market. The LTN line inductor features a very significant filtering of the whole harmonic spectrum, especially those of higher order (11th, 13th...) Additionally it solves one of the most important problems related to power converters, which are the notches and transients in the voltage causing malfunctioning and failure of electronic devices (PLC’s, computers,.....). These problems are often erroneously associated with harmonics and other, usually expensive filters are installed without providing any solution to the problem.

The installation of the LTN line inductors is straightforward and does not depend on any parameter of the electrical network. It is selected simply according to the rating of the mator that the power converter will supply. One inductor has to be installed with each power converter and it is important not to use a model with a higher rating than necessary. All other electronic equipment should be installed at the input of the inductor as indicated in the figure. In order to achieve a correct functioning of the installation and avoid resonance, it is important that only capacitor blanks with filtering inductors are used.


0.75kW - 315 kW Motor

Reduction of phase currents up to 30%
Reduction of voltage and current distortion up to 60%
Obtain power factor up to 0.93%
Obtain power factor up to  

Includes thermal protection


Solutions of H.F. System ( H10FN )

The H10FN series H.F. System is used in case a high level of filtering is requested, whether for being compliant with legislations or for meeting high quality requirements for the electrical supply. In order to obtain a correct filtering it is necessary to install as well a LTN line inductor with each DC converter or frequency converter. The H10F should be installed in such a way that it supplies 50% of the load to be filtered while the other 50% of the load should be supplied directly. 

The harmonic currents (5th, 7th, 17th, 19th), that have already been reduced by the LTN line inductors, will be compensated at the junction of the two branched of the load. This way the installation will be totally free of harmonics. The H10FN represents and economic solution, as only one unit has to be installed for 50% of the load.



10 kVA - 200 kVA

   
  C10F C10F+RTL
Reduction of phase currents up to 20% 35%
Reduction of voltage and current distortion upto 60% 85%
Obtain power factor up to 0.95 0.98

Includes thermal protection

   


Solutions of H.F. System ( H20FN )
The H20FN series H.F. System achieves the highest protection level for industrial installations. An elevated level of filtering of hte 5th, 7th, 17th and 19th harmonic is obtained in combination with galvanic isolation of the entire load. In order to obtain a correct filtering it is necessary to install as well a LTN line inductor with each DC converter or frequency converter. 

The H20FN H.F. System consists of two secondary windings. Each secondary should supply 50% of the load to be filtered. All harmonics are compensated in the secondary windings and do not circulate through of the electrical installation. The H20F provides additional advantages such as : reduction of electromagnetic disturbances, optional voltage adaption between input and output and the possibility use independence earths, as the neutral is isolated from the mains.



10 kVA - 250 kVA

   
  C20F C20F+RTL
Reduction of phase currents up to 20% 35%
Reduction of voltage and current distortion upto 60% 85%
Obtain power factor up to 0.95 0.98

Galvanic isolation between input and output
IInclues thermal protection

   

 
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