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HAF ABSORPTION FILTER
Description
Harmonic absorption filters are used when it is necessary to reduce the harmonic voltage and current distortion in the supply system. Absorption filters are formed by capacitors connected in series with reactors, tuned to the frequency of the harmonic to be suppressed. Filters are assembled in metal cabinets and include contactors and high rupture capacity fuses for short circuit protection. Thermal protection of the filter is achieved by means of thermal sensors located in the core of the reactors.
Technical Characteristics
Tensión nominal/Rated voltages......230, 400, 415, 480 V
Frecuencia de red/ ............................50 Hz (60 Hz)
Network frequency
Sintonización filtros/Filter tuning .....5 o, 7o , 11o, 13o
Regulación/Regulation ...................... by current or by harmonics
Grado de protección/ ......................
Degree of protection
Construcción/Construccion ................Armario metálico/Metal cabinet
Color armario/Cabinet colour ........Gris/Grey RAL 7035
Instalación/Installation...................... Indoor (floor mounting)
Normas/Standards ............................, ,
Standard steps
50 Hz 400V |
Absorption Filter tuning |
Maximum harmonic current |
QN (kvar) |
Irms (A) |
5o, 7o, 11o, 13o |
40 |
20 |
50 |
5o, 7o, 11o, 13o |
80 |
41 |
100 |
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Harmonic Filters
These filters are used when the main objective is not the reactive power compensation at the fundamental frequency, but to reduce the harmonic distortion in the supply system.
Among the problems caused by harmonics and which may make their suppression necessary, are the following:
Interferences in telecommunications.
Distortion on the mains voltage.
Disturbances in electronic systems.
Erratic operation of control and protection relays .
Failures in transformers and motors, due to overheating caused by losses on the core.
Overheating of protective fuses to the point where a minor spike on the line causes them to blow.
It should be pointed out that the impedance of all the filters is capacitive below its tuning frequency, whereby they also contribute, even if in a small scale, to the reactive power compensation at the fundamental frequency.
Installation of filters produces a modification on the topology of the electrical supply system. For this reason, the design of filters must be done with regard to an accurate analysis and study of the whole system.
According to the application, there are different types of filters:
3rd harmonic filter HBF-T
Isolation filter
Absortion filter HAF
High pass filter HPF
Active filter SINAF 2.0 
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