LV power factor correction

power factor


Low-voltage Power Factor Correction systems
from 230 V to 800 V, 50 Hz and 60 Hz
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Solutions with Nitrogen Gas filled Capacitors



+ 6,5 millions of kVAr realized
Fault 0,00001 %
24 months warranty as standard
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Power Quality



Harmonic Active Filters, AXF Series
Line Reactors, 3LR Series
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TELEGROUP, was the first Company in Italy to marry entirely both the Three-Phase technology, abandoning the archaic Single-phase type, and the typology of Nitrogen (N2) Gas filled Capacitors filling.

With the strength of being able to count on a very high quality component, TELEGROUP is now recognized as a highly specialized company in the production of Low Voltage PFC systems, installed in over 40 countries worldwide.






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Useful documentation Download
  • Catalog, technical sheets and useful material
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  • How is cos phi calculated?Open or Close

    To calculate the cos phi of the plant, it is necessary to have data on the consumption of Active Energy (kWh) and Reactive Energy (kVArh), or Active Power (kW) and Apparent Power (kVA).
    These values can be found in the electricity bill or through a network analysis. If in possession of kWh and kVArh

    Download Pdf for more information >>

  • How is the reactive power of an automatic PFC system calculated?Open or Close

    To define the required reactive power of an automatic PFC system, it is essential to have:
    • Active Power (kW)
    • Initial Cos φ (also deduced from the Active and Reactive Energy consumed, see above)
    • Desired Cos φ

    Formula: Q = P * k

    • Q: Necessary reactive power (kVAr)
    • P: Active Power (kW)
    • K: Cos φ coefficient from table >> attachment 1

    Plant with active power 650 kW and initial Cos φ 0.75, to be brought to 0.95.
    What is the necessary reactive power?

    500 kW *0.553 (coefficient K for cos phi from 0.75 to 0.95)
    = 276 kVAr

  • How can I choose the appropriate power of an automatic PFC system?Open or Close

    It is advisable to oversize the necessary reactive power by 15-20% in order to maintain an average Cos φ of 0.95 even with load variations and/or future extensions.

  • How is the reactive power of a fix PFCs calculated?Open or Close

    Compensation of MV/LV Trafo
    For economic reasons, it is advisable to compensate the reactive power that the Transformer absorbs for the magnetisation of the core and for the winder reactors.
    The choice of Reactive power can be made based on table >> attachment 2

    Compensation of Asynchronous motors
    The reactive power necessary for the power factor correction of Asynchronous Motors is chosen from the following table >> attachment 2
    It is always advisable in these situations to take into account the possible self-excitation of the capacitors, which is why the installation of an automatic PFC system rather than a fix one is preferred.
    It is always advisable to take into account possible operation of the Motor as a self-excited generator, and this can result in voltages that are considerably higher than those of the network.

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