Finding Primary and Secondary Currents?

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SUMMARY

This discussion focuses on calculating secondary current in transformers using given parameters such as kVA capacity, V1/V2 step-down ratio, primary and secondary copper impedances, magnetization inductance, core resistance, and load in phasor notation. The user seeks clarification on whether these parameters are sufficient to determine secondary current and the impact of load on voltage drop. It is established that while the equivalent circuit can be used to find primary current, secondary current calculations require careful consideration of load conditions and impedance effects.

PREREQUISITES
  • Transformer kVA capacity
  • V1/V2 step-down ratio and turn ratio
  • Copper impedance (primary and secondary)
  • Magnetization inductance and core resistance
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Electrical engineering students, particularly those preparing for exams on transformer theory and calculations, as well as professionals involved in transformer design and analysis.

khawarspirit
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Hi; first of all I'd like to say I love these forums and they always help me with anything I don't understand. But I can't find an answer for the question I've got in my mind.

So if we have the transformer's kVA capacity, the V1/V2 step down ratio (and therefore the turn ratio) and all of the following:
Primary copper impedance (Rp and Xp)
Secondary copper impedance (Rs and Xs)
Magnetization inductance and core resistance (Rc and Xm)
Load (in phasor notation)

° Are they enough to find the secondary current (by diving voltage V2 by load + copper impedance)?

°We don't know if the load is the rated load or not, so I know we can't divide the capacity by voltage to get current.

°I know can find the primary current by making the equivalent circuit, but I'll need the secondary current for it won't I?

°Will the voltage (that was V2 when circuit was open) drop when we connect the load (and does the difference between Es and Vs apply here?) and if so, could someone explain?

I'm sorry if this seems like a lot of questions. I went to my instructor but he didn't help me at all :(
Thanks in anticipation! :)
 
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No one? :( Please help me, I need this information for any transformer questions on my midterm exam...
 

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