Department of Electrical Engineering
Faculty Member:Mam Tahniyat
Dated: 2-3-2025
Siddique
Semester: 2nd semester
Section: BEE-16C
EE-211: Electrical Network Analysis
Name
Lab 05: Inductive Phase Shift and Reactive Power
Reg. No
Report
Viva
Total/15
Marks /
10
Museera Itlish
505629
Zainab Azfer Ali
502554
Yashfeen Zahra
504292
Faizan Ali
501258
Marks / 5
Introduction:
In power systems of electricity, inductive phase shift and reactive power are important factors in
defining power efficiency and energy transfer stability. Through this lab, we seek to study how
inductance influences phase angles in AC circuits and how the reactive power is created and
controlled. Through these principles, we can better comprehend power factor correction and reactive
power compensation in real-world applications in electrical networks.
Objectives:
The main goals of this lab are:
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To make observations and quantifications of the inductive phase shift of an AC circuit.
In order to examine the impact of inductance on the phase angle between voltage and current.
To compute and understand the reactive power in inductive circuits.
To support theoretical principles using practical circuit design.
Equipment:
The equipment uses in this lab is trainee machine.
Software:
The software used in lab was integrated with the trainee machine. The software shows all the
necessary like current, voltage, power, phase shift, waveform of applied voltages, currents and
power.
Procedure:
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Install the Power Supply, data acquisition module, and Inductive Load module into the EMS
Workstation.
Turn off the Power Supply, rotate the voltage control knob all the way counterclockwise, and
switch the voltmeter to 4-N. Plug in the Power Supply into a three-phase wall receptacle.
Set up the Inductive Load module by turning off all switches to have all inductors in parallel,
which gives the smallest inductance value (L_MIN). Connect inputs E1 and I1 to sense voltage
and current.
Connect the POWER INPUT of the data acquisition module to the Power Supply and connect
the USB port cable to the computer.
Open the **Metering** program and choose the setup file **ES14-1.dai**.
Power on the Power Supply, place the 24V AC power switch in the ON position, and set the
voltage control to the value of the provided E_S (E_L) from Figure 4-2.
Hardware setup:
Tasks:
7. Use the Record Data button to enter the voltage and current measurements in the Data Table,
and note the results below.
E_L = 220.0 V
I_L =1.063 A
8. Use the measured values of E_L and I_L to determine the inductive reactance X_L of the circuit.
X_L = E_L / I_L = 206.96
Ω
9. Use the value obtained for X_L1 to determine circuit inductance L_MIN.
L_MIN = X_L1 / 2πf = 0.6578
H
10. Is the value calculated in step 9 approximately equal to the value of inductance set on the
Inductive Load module?
☐Yes
11. Increase the circuit inductance by opening the three switches of one complete section on the
Inductive Load module. Measure and record E_L and I_L.
E_L = 220.5 V
I_L = 0.345 A
12. Determine X_L2 for these new values of voltage and current.
X_L2 = 639.13
Ω
13. Increase circuit inductance once again by opening the switches on a second section of inductors.
Measure E_L and I_L, and calculate X_L3.
E_L = 220.2 V
I_L = 0.692 A
X_L3 = 318.21 Ω
14. Calculate the ratios of the changes in reactance for the different circuits.
X_L2 / X_L1 = 3.09
X_L3 / X_L1 = 1.54
15. Knowing that the initial circuit was made up of three parallel inductors having the same
inductance, do the ratios of step 14 show that the inductive reactance changed in direct proportion to
the ratios of the changes in inductance?
☐ Yes
16. With E_S equal to 50% of the value used in step 6, calculate the circuit current for the present
circuit reactance set in step 13.
I_L = E_S / X_L3 = 0.346
A
17. Use the voltage control to set E_S equal to 50% of the value in step 6, and measure the circuit
voltage and current.
E_L = 110.4 V
I_L = 0.351 A
18. Compare the measured value of current with the value calculated in step 16. Are they
approximately the same?
☐ Yes
19. How well does the ratio of circuit voltage to current correspond with the present value of circuit
inductive reactance X_L?
The ratio is almost equal to the circuit inductive reactance.
20. Did the change in source voltage affect the value of circuit reactance?
☐ Yes
21. Did the measurements of circuit voltages and currents demonstrate that Ohm’s law is valid for
inductive AC circuits?
☐ Yes
Conclusion:
This experiment illustrated the effect of inductance on phase shift and reactive power. The findings
validated that inductors produce a lagging phase shift in AC circuits, with effects on power factor
and system efficiency. These concepts are crucial for designing effective electrical networks and
reducing power loss through reactive elements.