Linearity of Reactor

Linearity of Reactor
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An industry whose load includes a high proportion of non-linear load (harmonic generating loads), with poor power factor, requires capacitor with de-tuned filter. This performs the function of power factor improvement while preventing harmonic amplification.


Normally, the inductance of the series reactor (of de-tuned filter) connected is chosen such that the tuning frequency of the de-tuned filter is 10% below the lowest harmonic frequency with considerable current/voltage amplitude. Therefore, resonance does not happen in the system and reactor offers high impedance for higher frequency harmonics.

Detuned Filter Reactors Graph

Normally, 7% detuned reactors are designed considering typical industrial loads such as drives that have the following harmonic voltages: V3= 0.5% VN, V5= 6% VN, V7= 5% VN and so on. However, if the individual harmonic voltages increase, the following phenomenon happens: 

Harmonic Voltages Increase

Normally, reactors are designed with predefined linearity. A reactor having a higher linearity does not saturate for higher harmonic currents and prevents the system from a thermal run away as described above.

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Sourav Dasmodak,

Product Management & Marketing (Powergear - ACB)

Product Owner of Air Circuit Breaker (ACB) of Lauritz Knudsen for Domestic & International Market. I can talk to you about Electrical Products' Sales, Business Development, Market Expansion, Cracking Critical Strategic Account, handling Key Account & of course how to develop & motivate Channels along with the organizational growth. Having near about one and a half decade of experience across the country with major electrical manufacturers (Top 4).