PFMax-N

PFMAX-N

DYNAMIC POWER FACTOR WITH MAGNETIC CONTRACTOR

The design of harmonic control reactor

• • When the load harmonic content is very low (the harmonic content of bus voltage is not more than 1%), no need for series reactor.

  • When the harmonic content of bus voltage is less than 5%, and no requirements of current suppression and harmonic filtering, series detuning reactor can be used:

    • 6% or 7% reactor can be used when 3^rd harmonic voltage content is less than 0.5%.

    • More than 12% reactor should be used when 3^rd harmonic voltage content is more than 0.5%.

  • When load harmonic is heavier and demand filtering, tuned reactor should be used.

  • When using tuned reactor, filtering capacitor should also be used - When using tuned reactor or passive power filter, more complex tests and design are usually required, thus can achieve good effect, and there is also need of safe operation calibration to ensure the safe running of the equipment.

  • After serial reactor, the working voltage and reactive power output are all increased, the increment is equal to proportion of serial reactor.

According to different site condition, capacitor circuit will connect with 7% or 14% demodulation reactor in series,transfer capacitor/grid resonant frequency to below the main harmonics(5^th or 3^rd harmonic), avoid the resonance of capacitor and gird which could lead to capacitor damage and grid collapse.The above picture is typical magnified factor graph of capacitor/grid which connects 7% reactor in series, transfer the system resonant frequency from 5^th to 3^rd.