ENEE473 Lab 3 Report

ENEE473 Lab 3 Report - Scott R. Smith ENEE473 Lab 3:...

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Scott R. Smith ENEE473 Lab 3: Single-Phase Transformer February 23, 2007 Purpose: This experiment introduces single-phase transformer tests. The tests are used to characterize the transformer equivalent circuit model shown in figure 1. Transformer efficiency will be calculated and analyzed. R 1 +R 2 X 1 L +(X 2 L ) I 2 I 1 V 1 + V 2 + R e X 1m 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 and a resistance value of 250 . The power dissipation capacity can be increased by using parallel branches of resistors to achieve the same value as a series connection would. Transformer – There are three single-phase step-up transformers in the lab station. Each transformer is rated at 1 kW . The primary is on the left and secondary on the right. Experimental Procedure: I. Winding Sense Test Figure 2 C A Primary Secondary B D
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a. Series Adding 1. Connect the terminals in nominal “series adding” configuration. Short terminals B and C together. 2. Connect a single-phase AC source to the primary winding (across terminals A and B) and excite it with a low voltage (close to 10 V ). 3. Measure the voltage between terminals A and D. 4. Determine if the configuration is behaving as a “series adding” configuration. b. Series Subtracting 1. Connect the terminals in nominal “series subtracting” configuration. Short terminals B and D together. 2. Connect a single-phase AC source to the primary winding (across terminals A and B) and excite it with a low voltage (close to 10 V ). 3. Measure the voltage between terminals A and C. 4. Determine if the configuration is behaving as a “series subtracting” configuration. c. From the results of parts “a” and “b”, determine which terminals are “dotted”. II.
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ENEE473 Lab 3 Report - Scott R. Smith ENEE473 Lab 3:...

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