Hello,
I had to do an experiment about a single phase transformer 230V/230V, 50 Hz, 100 VA , where the transformer secondary was open-circuit and there was an universal power supply which goes from 0% to 100%. I had to record the primary and secondary voltage and the primary current and these were my results.
% ____Primary Voltage(V) __Secondary Voltage(V) _Primary Current(mA)
0_______17.915______________19.403 _____________ 6.556
10_______42.100_____________45.590______________10.423
20_______66.200_____________71.940______________12.870
30_______88.69 _____________96.32_______________14.901
40_______112.29_____________122.16_______________16.792
50_______137.70_____________150.16_______________18.870
60_______162.62_____________176.96_______________21.36
70_______187.24_____________203.8________________24.60
80_______210.4______________229_________________29.12
90_______235.5______________256.2________________36.91
100_______240.8_____________260.21________________38.28
From those results I got that the turns-ratio is about 1.08 but I have to compare and comment on the measured transformer secondary voltage considering the rating of the transformer but I'm not too sure what do I have to say.
Also, I have plotted the primary voltage against the primary (magnetising) current as it can seen below but I'm not sure if the shape of the curve is right. Is it normal to get a shape like this one, if it is, why?
Thank you for your help!
I had to do an experiment about a single phase transformer 230V/230V, 50 Hz, 100 VA , where the transformer secondary was open-circuit and there was an universal power supply which goes from 0% to 100%. I had to record the primary and secondary voltage and the primary current and these were my results.
% ____Primary Voltage(V) __Secondary Voltage(V) _Primary Current(mA)
0_______17.915______________19.403 _____________ 6.556
10_______42.100_____________45.590______________10.423
20_______66.200_____________71.940______________12.870
30_______88.69 _____________96.32_______________14.901
40_______112.29_____________122.16_______________16.792
50_______137.70_____________150.16_______________18.870
60_______162.62_____________176.96_______________21.36
70_______187.24_____________203.8________________24.60
80_______210.4______________229_________________29.12
90_______235.5______________256.2________________36.91
100_______240.8_____________260.21________________38.28
From those results I got that the turns-ratio is about 1.08 but I have to compare and comment on the measured transformer secondary voltage considering the rating of the transformer but I'm not too sure what do I have to say.
Also, I have plotted the primary voltage against the primary (magnetising) current as it can seen below but I'm not sure if the shape of the curve is right. Is it normal to get a shape like this one, if it is, why?
Thank you for your help!