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Tuning (Filter) Reactors

Tuning reactors are connected with capacitors to tuned filter circuits with resonance in the audio frequency range to reduce, block or filter harmonics or communication frequencies. The tuning reactors are connected either in a parallel configuration in the system (with system voltage applied across them) or in a series configuration (with load current flowing through them). The diagram illustrates the two main types of filters in their basic forms.

Tuning reactors are single-phase or three-phase reactors, oil-immersed or dry-type. The reactors may be designed with means for adjusting the inductance value within a limited range either by tappings or by movement of core and/or coils. The preferred or recommendable design solution in each particular case should be indicated already in the enquiry or the tender.

Tuning reactors for audio frequency signals may be equipped with a second winding connected t the audio frequency source or to other components.