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EE2151-CIRCUIT-THEORY--->View question View all qusetions
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Star Delta Transformations allow us to convert impedances connected together in a 3-phase configuration from one type of connection to another.

The value of the resistor on any one side of the delta, Δ network is the sum of all the two-product combinations of resistors in the star network divide by the star resistor located “directly opposite” the delta resistor being found. For example, resistor A is given as:
A = PQ + QR + RP/R
with respect to terminal 3 and resistor B is given as:
B = PQ + QR + RP/Q
with respect to terminal 2 and resistor C is given as:
C = PQ + QR + RP/P
with respect to terminal 1.
By dividing out each equation by the value of the denominator we end up with three separate transformation formulas that can be used to convert any Delta resistive network into an equivalent star network as given below.



One final point about converting a star resistive network to an equivalent delta network. If all the resistors in the star network are all equal in value then the resultant resistors in the equivalent delta network will be three times the value of the star resistors and equal, giving:R(delta) = 3R(star).

Answerd on:2017-06-27 Answerd By:Aparna-Dasgupta

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