ENEE473 Lab 2 Report

ENEE473 Lab 2 Report - Scott R Smith ENEE473 Lab 2...

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Scott R. Smith ENEE473 Lab 2: Three-Phase Power Measurements February 9, 2007 Purpose: This experiment introduces three-phase power. Measurement, connectivity, and behavior of balanced and unbalanced three-phase circuits are covered in these experiments. Devices and Instrumentation: Resistor Banks – Each bank of resistors is made up of ten individual resistors that can be connected together using single pole double throw switches. By systematically setting the switches it is possible to create many resistance values by combining series and parallel branches in one bank. Each resistor has a power dissipation rating of 100 W . The power dissipation capacity can be increased by using parallel branches of resistors to achieve the same value as a series connection would. Experimental Procedure: I. Single-Phase Power Measurement 1. Connect a single-phase AC source capable of 120 V to a load of 500 through a wattmeter so as to measure the power supplied to the load. 500 is realized by connecting two banks of 1000 in parallel to increase the power dissipation capacity of the resistors to 800 W . 2. Use the ohmmeter to verify the selected resistance. 3. Ensure that the resistors are able to handle the expected power to be delivered. 4. Turn on the AC source and increase the voltage to 120 V . 5. Measure and record the voltage, current, and the power delivered to the load. 6. Compare this measured power value with the theoretical power value. II. Three-Phase Voltages 1. Connect each of the three phases of the variac through the voltage-divider box, then to the oscilloscope. 2. While measuring with a meter, increase the variac phase voltage to no more than 120 V . 3. Observe the three-phase AC voltage on the scope. Determine the phase sequence from the scope. III. Balanced Three-Phase Power, Y-Y Connection 1. Connect three resistor banks (each 500 ) as a Y-load and configure the three- phase AC source of voltages connected as a Y-source. Do not connect the neutral. 2. Connect the three-phase source to the three-phase load with two wattmeters. One will measure current of phase A and voltage to phase B. One will measure current of phase C and voltage to phase B.

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3. Turn on the three-phase AC source and increase the line-to-line voltage to 208 V . 4.
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This note was uploaded on 05/04/2008 for the course ENEE 473 taught by Professor Mayergoyz during the Spring '07 term at Maryland.

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ENEE473 Lab 2 Report - Scott R Smith ENEE473 Lab 2...

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