Calculating Transformer Input Voltage?

[Loppyfoot]

Homework Statement

A 2400/240-V, 60-Hz transformer has the following parameters in the equivalent circuit of Figure 6.5: the high-side leakage impedance is (1.2+j2.0)Ω, the low-side leakage impedance is (0.012+j.02)Ω, and X_m at the high-side is 1800 . Neglect R_he. Calculate the input voltage if the output voltage is 240 V (rms) and supplying a load of 1.5 at a power factor of 0.9 (lagging).

The Attempt at a Solution

No idea how to begin.

 

[rude man]

Draw up your equivalent circuit and solve for Vin.

While you're at it, is Xm = 1800 in ohms or henrys? And what about " .. a load of 1.5 ..."? Units of 1.5?

 

[Loppyfoot]

The load is 1.5Ω, and X_m is also in Ω.

 

[rude man]

Show us your equivalent circuit?

1.5 ohms is a very large load. You sure about it? If so, what component do you need to add to the load resistor to make the total impedance 1.5 ohms? (Or, what component needs to be added to the 1.5 ohm resistive load? I'm not sure which is the case here).

 

[berkeman]

Homework Statement

A 2400/240-V, 60-Hz transformer has the following parameters in the equivalent circuit of Figure 6.5: the high-side leakage impedance is (1.2+j2.0)Ω, the low-side leakage impedance is (0.012+j.02)Ω, and X_m at the high-side is 1800 . Neglect R_he. Calculate the input voltage if the output voltage is 240 V (rms) and supplying a load of 1.5 at a power factor of 0.9 (lagging).

The Attempt at a Solution

No idea how to begin.

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