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Consider a three phase reactor (inductor) using E-I or E-E laminations with phase winding on each limbs. Now inductance of R phase is given by:

Lr=Lrr+Mry+Mrb

Lrr: Self inductance of R-phase Mry: Mutual inductance between R and Y phase Mrb: Mutual inductance between R and B phase.

When such inductance is excited with three phase supply Mry=Mrb=-0.5*Lrr. Hence total inductance will be zero.

This means three phase reactor does not offer any inductance?

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  • \$\begingroup\$ That sounds correct. \$\endgroup\$ – Andy aka Jun 8 at 11:46
  • \$\begingroup\$ Then how three phase reactors are available commercially specially for passive harmonic filtering? \$\endgroup\$ – chatty85 Jun 8 at 12:09

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