Many modern industrial components incorporating static converters generate harmonics in power networks.
The sharp increase in recent years in the use of such components and the modern techniques of direct current transmission over long distances, have forced electricity distribution companies to control and limit the rate of harmonics present in distribution networks following the recommendations of various national and international bodies: IEC, CENELEC, IEEE, CIGRE, and so on, to avoid the damage produced by these alterations of the waveform.
In harmonic filtering networks resistors are placed in order to extend the spectrum of attenuated frequencies and so that their efficiency is not affected by changes in operating conditions, thereby increasing their effectiveness.
The basic features for designing a resistance for harmonic filters are:
Power to be dissipated.
Level of insulation.
Degree of protection of the envelope.
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