The general idea is to compute an impedance formula_5 in the Δ circuit by

where formula_11 is the sum of the products of all pairs of impedances in the Y circuit and formula_12 is the impedance of the node in the Y circuit which is opposite the edge with formula_5. The formula for the individual edges are thus

उपयोग
तीन-फेजी परिपथ में Δ-लोड को Y-लोड में बदलने का समीकरण
तीन-फेजी परिपथ में Y-लोड को Δ-लोड में बदलने का समीकरण
ग्राफ सिद्धान्त (Graph theory)