Friday 14 February 2014

Star To Delta Transformation Or Star To Delta Conversion And Formulas

STAR TO DELTA TRANSFORMATION OR STAR TO DELTA CONVERSION AND FORMULAS

Fig:-
transformer connection diagram formula

Suppose, RA  , RB and RC is three resistances connecting to each other such that they forms a star connections or star networks.

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

Fig:-
3 phase transformer calculation formulas

So, we make a delta connection. Connecting pt.1 to pt.2 and pt.3 and also connecting pt.2 to pt.3. It will form a new network as ‘delta connection’ as I shown through dotted diagram and hence forms a new ‘Delta circuit’.

For new circuits containing new resistances is R12  , R13 and R23 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:-

Fig:-
3 phase transformer calculator

How to remember?

The equivalent delta resistance between any two terminals is given by the sum of star resistances between those terminals plus the product of these two star resistances divided by the third star resistance”.

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