Faculty of Engineering & Technology
Department of Electrical & Electronic Engineering.
EEB 241: Electrical Fundamental II
2018/2019: Semester 2
Assignment 2
Distributed: 15/04/2019
Submit by: 26/04/2019, 12MD at the TA’s office.
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ELECTRICAL FUNDAMENTALS MATERIAL, Lecture notes of Electrical Engineering
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Faculty of Engineering & Technology
Department of Electrical & Electronic Engineering.
EEB 241: Electrical Fundamental II
2018/2019: Semester 2
Assignment 2
Distributed: 15/04/
Submit by: 26/04/2019, 12MD at the TA’s office.
Question 1
A 15kVA 2300/230V transformer is to be tested to determine the excitation branch components, its series impedances, and its voltage regulation. The following test data have been taken from the primary side of the transformer
Open Circuit Test Short Circuit test Voc = 2300V Ioc = 0.21 A Poc = 50W
Vsc = 47V Isc = 6A Psc = 160W
a) Find the equivalent circuit of this transformer referred to the low-voltage side. b) Calculate the full-load voltage regulation at 0.8 lagging power factor, 1.0 power factor, and at 0.8 leading power factor using the exact equation for Vp. Identify and sketch one of the phasor diagrams. c) Perform the same three calculations, using the approximate equation for Vp. How close are the approximate answers to the exact answers? d) What is the efficiency of the transformer at full load with power factor of 0.8 lagging?
[70]
Question 2
The two pole generator shown in Fig Q2a generates a three-phase voltage of phase sequence ABC as shown in Fig Q2b. Assuming the following data: Bm=1.2T, armature length is 0.5m, the rotor turned at 1t 1500r/min, and the inside diameter of the stator core is 0.4m.
Figure Q2a