ECE 3072 lab 3 Report - Prana Koirala Georgia Institute of...

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Prana Koirala Georgia Institute of Technology ECE 3072- L10 LAB#3 – TRANSFORMER Date Summited: 10/02/2015
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ECE 3072 Prana Koirala Lab#3 Transformers Page 1 of 6 Lab 3 – Transformers 111Equation Chapter 1 Section 1 Procedure CAUTION! High voltages are present in this lab. Do not make or modify any connections with the power on. Prior to energizing circuits, the TA should check all connections. Never exceed the rated voltage and/or current on ANY of the transformer windings or load modules for more than a few seconds. Damage to these units can occur. Single Phase Transformer 1. List the voltage and power ratings of windings 1-2 and 4-5 indicated on the front panel of the module. What would the current flowing through each winding be when the transformer is operated at rated voltage and power? What is the theoretic turns ratio of this transformer (N 1 /N 2 )? Voltage Power Current (Power/Voltage) Winding 1-2 208 V 250 W 1.20 A Winding 4-5 120 V 250 W 2.08 A Theoretical Turn Ratio e1/e2 = I 2 /I 1 = 0.577 2. Before energizing the transformer, using the digital multimeter, measure the resistance of windings 1-2 and 4-5. Winding 1-2 R 1-2 = 5.74Ω; Winding 4-5 R 4-5 = 4.50Ω 3. Connect the (0 - 120 V) AC-power supply (line-to-neutral), the transformer module, and the data acquisition interface as depicted in Fig. 4 . Use the Lab-Volt Metering tool to also setup power meters to measure input and output real power, P 1 and P 2 . Make sure that the meters are set to measure AC values. Figure 4. Single-phase transformer wiring diagram for steps 3-6.
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ECE 3072 Prana Koirala Lab#3 Transformers Page 2 of 6 4. In this step you will prove (or disprove) the rule for referring an impedance from the secondary to the primary of the transformer. Connect a 1200 Ω resistive load across windings 1-2, as shown in Fig. 4 . After verifying all connections, energize the circuit by adjusting the input voltage to 120 V. Record V 1 and I 1 . Using these values determine the resistance seen by the power supply. Compare this result with the resistance obtained by referring the 1200 Ω resistor to the primary using the theoretic turns ratio calculated in step 1. Comment on any differences observed.
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