Automatic Control Capacitor, Automatic Capacitor Bank, Automatic Filter, Electronic Filter

Automatic Control Capacitor

AB Lifasa Automatic capacitor/Filter banks are used for centralised compensation of power factor in low voltage installations.

AB Lifasa also provides wide range of automatic capacitor banks with harmonic filters. These equipments are supplied completely assembled and are ready for use. It is only necessary to connect it to the mains with cable of adequate cross section, and to supply the operation signal from a suitable current transformer.

Automatic Capacitor Bank

General Characteristics:
AB LIFASA Automatic capacitor banks are composed of the following elements:

High Rupturing Capacity (HRC) fuses connected to a busbar system.

Contactors specially adapted to the work with capacitors.

Inrush current limiting inductances.(Optional).

Fast discharge resistors.(Optional).

Low losses power capacitors.

Reactive power controllers.

Terminals for neutral and ground conductors.

Metal cabinet containing all the switchgear.

Advantages:

Equipment wired and tested at works, full finished and supplied with all control and safety devices.

Easy transportation and installation due to their light weigh.

Long life and high reliability, thanks to the use of self-healing and low losses capacitors.

Wide range of power (from 25 to 1000 kva, 440 V) with standard equipment for immediate delivery.

Option of including various accessories.

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Automatic Filter

AB Lifasa supply Automatic Detuned filter banks for installation having high levels of harmonic distortion.

These banks are completely assembled and ready for use like Automatic control capacitor bank as explained above.

The low cost, iron core, highly linear reactors of suitable ratings are provided in series with each capacitor unit.
The tuning frequency of the whole unit is set at a value between the fundamental frequency and the frequency of the lowest present harmonics.

AB Lifasa provides a wide range of ratings upto 3000 kva, 440V with tuning frequency of 189 Hz. Other voltage and tuning frequencies are also available on request.

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Electronic Filter

Traditional reactive power compensation equipments with electromechanical contractors, have a well proven performance in installation where the load has, slow variations and it is not very sensitive to voltage fluctuation. Today, however, more and more industrial installations, include electronic equipments that are very sensitive to voltage variations (PLC, computers, etc.) and also have very fast changing working cycles (automatic welding machines, robots, etc. ).

Reactive power compensation with static contractors(Thyristor switch) offers the best answer to these new industry requirements.

AB LIFASA Automatic capacitor banks with static contractors, use thyristors instead of traditional contractors. The thyristors switch-on capacitors on zero crossing voltage, and switch them off on zero current situation. The firing strategy grants a totally transient free switching of power capacitors, avoiding any problems with transient over voltages.

This firing strategy grants a totally transient free switching of power capacitors, avoiding any problems with transient over voltages.

This transient free switching gives a very fast reaction time of the power factor equipments with sudden reactive power demand variations. This reaction time (the time to switch on or off a capacitor step) is usually not higher than 20 milliseconds. This means that upto 50 operations per second are possible.

Please see pdf file for advantages of Thyristor Switches over Contactor Switching.

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