How to find source current in transformer

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SUMMARY

The discussion focuses on calculating the source current (I1) in a transformer using its equivalent circuit parameters. The equivalent impedance was calculated as 216.683 + j32.6405 ohms. The user attempted to find I1 by dividing the source voltage of 2400V at an angle of 30 degrees by the equivalent impedance but encountered discrepancies with the expected answer. The correct approach involves ensuring proper conversion of voltage and impedance into rectangular form for accurate calculations.

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ladykatt008
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Homework Statement



Refer to the figure attached. The single phase "exact"-equivalent circuit of a practical transformer has the following equivalent circuit parameters: Np/Ns = 2400V/240V, Rp = 14.1, Xp = 31.2, Rs = 78.5*10^(-3), Xs = 120.5*10^(-3), Rc = 156*10^3, Xm = 172*10^3. The load is a resistor with a value of RL = 1.95. The source voltage is 2400 with an angle of 30 degrees.

Determine the source current I1.
Determine the voltage Ep.


2. The attempt at a solution

I calculated the equivalent impedance to be 216.683+j32.6405 ohms.
And I assume that I1 would just be the source voltage 2400 ang(30) divide by the equivalent impedance.. but I keep getting the wrong answer
 

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I assume the reason you think your answer is wrong is because your text has the answer.

If you will show the answer you get and also the "correct" answer, we should be able to determine your problem.
 

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