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Three Phase Circuits report

# Three Phase Circuits report - Three Phase Circuits JEE4350...

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Three Phase Circuits JEE4350 Prof. Dick Report by Joe Doyle Lab partners: Artem Boyko Ryan Mason Performed on March 3 2009

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Part 1A The phase sequence provided by the 3-phase wall supply in the lab was CBA. By flipping the switch to reverse on the sequence indicator we were able to obtain ABC. The measured phase angle for B was -121 degrees and C was 122 degrees. This agrees with the phase sequence indicator. When using the STAR point, our output waveform essentially combined the 3 phases. The expected RMS voltage was 35V and the scope reading indicated 33.54V. Part 1B Line to Line voltages and Average Vab(V ) Vac(V ) Vbc(V ) Avg(V ) 64.65 64.12 63.14 63.97 Deviation from average value ---------------------- Line to neutral voltages and Average Vlna(V ) Vlnb(V ) Vlnc(V ) Avg(V ) 36.95 37.77 36.3 36.9 Vab(V ) Vac(V ) Vbc(V ) 0.68 0.15 0.83
Deviation from average value Vlna(V ) Vlnb(V ) Vlnc(V ) 0.04 0.86 0.6 Ratio of two averages = 63.97/36.9 = 1.733604 This is very close to theory. The square root of 3 is 1.73205 and our measured ratio is only .001 away from this number. I think the laboratory supply is adequate for the 3 phase circuit experiment. It is difficult to get a perfectly balanced supply, and for educational purposes this is close enough. Part 1C

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Three Phase Circuits report - Three Phase Circuits JEE4350...

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