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ELEC302 Lab 4 - ELEC302-01 Lab#4 Transformers in Three...

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ELEC302-01 Lab #4: Transformers in Three Phase Circuits February 19 th , 2008 David Bunn Michael Schmick The work contained herein is our own. We have neither knowingly given nor received any portion of this laboratory report .
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Introduction: Using a three phase transformer network, all four types of primary- secondary network connections were explored. These types are Delta-Delta, Wye-Wye, Delta-Wye, and Wye-Delta. The differences in observed current, voltage, and power among these different networks were noted and examined. The measured values were then compared against the computed values and analyzed. Equipment List: EMS 8821 Power Supply Module EMS 8348 Three Phase Transformer Module EMS 8311 Resistance Module EMS 8321 Inductance Module EMS 9062 Data Acquisition Interface (DAI) EMS 30004 DAI 24V Power Supply Fluke 8010A Multimeter Procedure: Part 1: The Three Phase Source For safety reasons, the EMS workstation was checked for all components and the power supply module was assured to be off and the voltage selector fully counter- clockwise. The DAI’s power supply was turned on, and the acquisition software on the computer was started and the template for the lab loaded. The voltmeter selection switch was set to 4-5. Then the DAI’s E1, E2, and E3 voltmeter ports were connected to the power supply as shown in Figure P-1. The power supply was turned on and set to 120V and the voltages measured and recorded. Phasor angles were confirmed to be roughly 120 degrees separate from each other. The voltage was reduced back to zero and the power turned off. The voltmeter connections were then changed to reflect Figure P-2, and those voltages measured in the same manner. Figure P-1: Line Voltage Measurement Figure P-2: Phase Voltage Measurement Part 2: Wye-Wye Connected Transformer The circuit in Figure P-3 was constructed. Each impedance was a balanced 600 + 300jΩ. The power was turned on, and the voltage increased to 120V. The value was assured by looking at the voltmeters E1 and E2. The primary line voltage (E1), secondary line voltage (E3), secondary line current (I3), and real power (a derived measure called B in the measurement software) were measured and recorded. The
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voltage was then reduced to zero and the power turned off.
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