Sunday 23 March 2014

Delta To Star Transformation Or Delta To Star Conversion and Its Formulas

Delta To Star Transformation Or Delta To Star Conversion and Its Formulas

Fig:-
delta-wye transformer neutral grounding

Suppose, R12  , R13 and R23 is three resistances connecting to each other such that they forms a delta connections or star networks.

 Now, we have to convert this circuit in star for solving or simplifying given star connected circuits. Because if you are not convert may not get equivalent resistances of that given circuit.
Fig:-
star delta connection of transformer pdf

So, we make a star connection by connecting pt.1, pt.2 and pt.3 to pt. O such that they form as star connection as shown in fig. It will form a new network as ‘Star connection’ as I shown through dotted diagram and hence forms a new ‘Star circuit’.

For new circuits containing new resistances is RA  , RB and RC  having new value’s. For these new resistances we have direct formula’s I am going to give you because no need of derivation, kindly used direct formulas as given below:-


transformer connection diagram

How to remember?


Resistance of each arm of the star is given by the product of the resistances of the two delta sides that meet at its end divided by the sum of the three delta resistances”.


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