Engineering Understanding Transformer Power Measurements with Open Circuit Experiment

AI Thread Summary
The discussion revolves around measuring transformer power, specifically focusing on parameters aM and R_c. It is noted that in an efficient transformer, the power loss on R_1 is negligible compared to R_c, allowing the power meter to effectively measure the power on R_c. There is confusion regarding the definition of aM, which is suggested to represent the magnetizing inductance of the transformer. Participants express uncertainty about how to derive aM from total impedance and seek clarification on its meaning. The conversation highlights the need for a clearer understanding of these measurements in transformer analysis.
nhrock3
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http://i44.tinypic.com/142zgg5.jpg

they say that we can measure aM and R_c

they say that in a good transformer the power waisted on R_1
is much smaller then on R_c
then we can neglect the power on R_c
so the power measured on the power meter will be the power on R_c

http://i39.tinypic.com/20zpcvm.jpg

why
aM=L_c
?
if we measure the voltage threw those to points
we need to know the current to get z_eq
and i don't have short circuit citiation here
 
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nhrock3 said:
http://i44.tinypic.com/142zgg5.jpg

they say that we can measure aM and R_c

they say that in a good transformer the power waisted on R_1
is much smaller then on R_c
then we can neglect the power on R_c
so the power measured on the power meter will be the power on R_c

http://i39.tinypic.com/20zpcvm.jpg

why
aM=L_c
?
if we measure the voltage threw those to points
we need to know the current to get z_eq
and i don't have short circuit citiation here

I think they are just asserting that aM = L_c. I don't know why they labelled it aM in the first place. It's the magnetizing inductance of the transformer, I would think, in parallel with the transformed load resistance.
 
i posted it in the wrong sub forum
damn i am tired
please move it to tech
 
No worries, thread moved. Are they just making a definition for us to use?
 
no they just say that from the total impedance we could know aM

but i don't know how?
 
nhrock3 said:
no they just say that from the total impedance we could know aM

but i don't know how?

What does aM stand for anyway?
 

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