ECE 3072 lab4 Report - ECE 3072 Lab 4 Transformers Archit R...

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ECE 3072 Lab 4 Transformers Archit R Jain Section L03 10/9/2013
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Single Phase Transformer 1. POWER 250 VA – 208 V / VOLTAGE 208V ~ 1.2 AMP 4-5: I1 = 250/120 = 2.08 AMP 1-2: I2 = 250/208 = 1.2 AMP Theoretic turns ratio of this transformer (N 1 /N 2 )? 120V/208V = N1/N2 = a = 0.577 2. 4-5: 2.729 Ω = R 1 1-2: 4.026 Ω = R 2 3. No load Voltage, Current, and Power V1 118.9 P1 7.353 I1 0.187 V2 206.5 P2 0.012 I2 0.003 4. Resistance seen by power supply: 119 V/ 0.381 = 312.33 Ω = Z2 Z2’ = a^2 * Z2 = 1200 * (N1/N2)^2 Z2’ = 400 Ω 5. Voltage, Current, Power, Rc, Q, Xm, and a for the circuit shown above. Voltage Current Power Rc Q Xm a 1 119.2 0.187 7.329 1938.687 21.051 674.962 0. 5 7 7 5 2 206.4 0.003 0.049 869407.34 7 . 617258 69016.45 7
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Use equation Rc = V1^2/P1, Xm = V1^2/Q1, where Q1 = sqrt((V1I1)^2-P1^2) a = V1/V2 The measured turns ratio is very close to the theoretic turns ratio, with a percent error of .2%. 6. Voltage Current Power 1 5.19 1.238 6.304 2 0.165 .713 0.066 Calculated from Req = P1/I1^2, Xeq = Q1/I1^2, where Q1 = sqrt((V1I1)^2-P1^2) Req = 4.1131 Ω Xeq = 0.7647 Req is slightly smaller than the theoretical Req value yielding a 2.52% error. 7.
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