Harmonic filters are inductance coils connected in series to compensation capacitors. They protect the system's devices and machines against the corrosive effects of harmonics by using reactive power compensation components.

   

       OMSAN harmonic filters are produced under the ISO:9001 quality management system and have a CE certificate within the scope of the EN 61558-2-20 standard. 

​

        CAUSES OF HARMONIC DISTURBANCES:

 

THD, that is, the source of harmonic distortions in voltage and current, is non-linear charges if we list these loads briefly:

 

• Uninterruptible power supplies,

• Motor starters,

• Motor drivers,

• Speed controllers,

• Computer and electronic lighting,

• Welding machines,

• Power electronics converters,

• Rectifiers and similar devices affect increasing harmonic distortion in the network.

       THE MAIN FAILURES CAUSED BY HARMONIC DISTORTIONS ARE;

 

• Heating of electromechanical devices and cables,

• Mechanical vibrations (vibration) in machines,

• abnormal operation of ignition circuits,

• Voltage spikes,

• Punctures in cables and other electromechanical devices due to high voltage

• Malfunctions in electronic cards, devices, and computers,

• Power losses, punctures, and explosions in power capacitors,

• Openings in compensation fuses,

• Unjustified openings in breakers and switches,

• Distortion and abnormal operation of relay signals,

• Energy losses.

 

      BENEFITS OF USING HARMONIC FILTERS:

​

• They prevent overload by reducing voltage and current harmonic values and thus extend the life of compensation capacitors,

• They reduce the risk of reactive penalties,

• They help to regain the sinusoidal waveform by reducing elevated system harmonics,

• They prevent the devices and machines used in the facility from being damaged due to harmonic distortions,

• They prevent overheating of transformers, cables, busbar systems, and other wound devices,

• They prevent capacitors from drawing instantaneous overcurrent,

• They prevent the compensation system from resonating,

• They prevent fuses from opening prematurely,

• They reduce the problems and malfunctions experienced in electronic cards, devices, and computers, the causes of which cannot be understood.

 

 

HARMONIC FILTER SELECTION

​

        Harmonic filters are selected according to the primary voltage, frequency, decay, filtering factor, and reactive power of the stage to which they will be connected. The harmonics should select the resonant frequency. When choosing the capacitor voltage, it is necessary to calculate the voltage from the filter to the capacitor according to the filtering factor and select the capacitor voltage above this value. We must not forget that the step power is equal to the harmonic filter power so as not to cause incomplete compensation power. It is necessary to calculate the total reagent compensation power according to the power values of the filters.

 

        Since the filters will increase the panel's heat, the ventilation system should be trouble-free and long-lasting. Much attention should be paid to selecting filters and capacitors in filter compensation systems to be installed to correct harmonic distortions. The design of harmonic filters is made according to factors such as resonant frequency (mostly 134, 189, 210 Hz), capacitor power, and capacitor voltage.

​

         Harmonic filters produce a higher voltage than the mains voltage. Considering that the voltage value is higher than usual during the night, especially in organized industrial zones, ensure that the voltage values of the capacitors to be installed in the system are high.

 

         Do not forget that when capacitors with values different from the voltage and power values that should be attached to the harmonic filters are connected, the system's resonant frequency will shift, and performance will decrease. For this reason, filters should be designed according to the capacitors' power and voltage values.

 

        Harmonic filters cause an increase in temperature in the panel. For this reason, make sure that the panels are made in such a way that they provide sufficient airflow.

In compensation systems with harmonic filters, the final power will differ from the sum of the capacitor power values. For this reason, do not forget to consider the harmonic filters when calculating the power so as not to make incomplete compensation.

​

The minimum information you need to convey to our company to respond to your harmonic filter requests:

 

• Mains voltage,

• Resonant frequency (134, 189, 210 Hz),

• Capacitor powers and voltage values,

• THDU and THDI min.-max. Values

• If the harmonic decay of the energy system is high, harmonic analysis report.

 

       MAGNETIC CORE DESIGN IN HARMONIC FILTERS:

​

     The linearity of the filter's magnetic properties is critical in designing series harmonic filters. In this context, the magnetic core design of the filter is an important consideration.

​

       Any nonlinearity causes the following problems:

​

• Increased power losses in areas adjacent to air gaps

• Heat increase

• Increase in audible noise

​

​

​

​

​

​

​

​

​

​

​

​

​

​

 

 

        IMPORTANCE OF MAGNETIC CORE DESIGN:

 

The correctly designed magnetic core allows the following gains to be achieved:

• Provides a constant inductance value regardless of wide-range changes in harmonic filter current (magnetic linearity),

• Reduces the level of audible noise,

• Eliminates the external magnetic field (as seen in the drawings),

• It reduces additional losses in winding and structural elements.