ECET 3500 Lab 2 Transformer Characteristics and Performance Page 1 of 4
Page 1 of 4
Before making any electrical connections, draw an appropriate test circuit including instruments. Have your
instructor check and initial this proposed circuit, before connections are made. Before applying power to the
circuit, have your instructor check the wiring.
All laboratory work will involve the EMS ________ Transformer Module
Measurements
1. Measure the primary current as a function of applied primary voltage, with the secondary winding open
circuited. For this test use winding 1-2 as the primary and winding 5-6 as the secondary. Limit primary
voltage to 200 volts.
Ep(V) IP(mA)
0
20
40
60
80
100
120
140
160
180
200
2. Designate winding 3-4 as the primary and winding 1-2 as the secondary. For a unity power factor load,
measure primary voltage, secondary voltage, and secondary current from zero load to rated load. For the
duration of this test maintain 208 V on the primary.
3. For a capacitive load, measure primary voltage, secondary voltage, and secondary current from zero load to
rated load. For the duration of this test maintain 208 V on the primary.
4. For an inductive load, measure primary voltage, secondary voltage, and secondary current from zero load to
rated load. For the duration of this test maintain 208 V on the primary.
5. Determine the polarity for the three windings of the transformer module.
I. Determine the polarity of winding 5-6 relative to winding 1 -2
a. Set V12 to 10 V and then measure V56
b. Connect terminal 2 to terminal 6 and measure V15
c. Remove the connection from terminal 2 to terminal 6
d. Connect terminal 2 to terminal 5 and measure V16
e. Turn the power OFF and remove all connections to the transformer
II. Determine the polarity of winding 3-4 relative to winding 1 -2
a. Set V12 to 10 V and then measure V34
b. Connect terminal 2 to terminal 4 and measure V13
c. Remove the connection from terminal 2 to terminal 4
d. Connect terminal 2 to terminal 3 and measure V14
e. Turn the power OFF and remove all connections to the transformer
III. Determine the polarity of winding 5-6 relative to winding 3 -4
a. Set V34 to 10 V and then measure V56
b. Connect terminal 4 to terminal 6 and measure V35
c. Remove the connection from terminal 4 to terminal 6
d. Connect terminal 4 to terminal 5 and measure V36
e. Turn the power OFF and remove all connections to the transformer
