King Fahd University of Petroleum & Minerals
Electrical Engineering Department
EE-306 – Semester (221)
Design Project
Due Date: December 4th, 2022 @ 10:00pm
Upload in BB under “Assignments” – to 221-EE-306 [Common:2,6,7,9]
Design & Specifications of a Single -phase Transformer
1. Objectives
Design and specify the ratings of a single-phase transformer to supply several loads from 600-V
source. The design must include the determination of the transformeràkVA rating, and
specifications of its primary and secondary currents. It should also attempts to determine the
efficiency of the transformer under different loading conditions (LDé.
Starting a transformer generally requires more current than running it at its normal LD. To account
for this additional current requirement, itàoften helpful to put a start factor of 20% extra into the
design calculations.
2. Project Data
The building has the following loads:
Type of Loads
Rating Load Voltage
(VA)
(V)
Lighting load
4000
220
1.0
Laundry equipment
2000
220
0.85
Kitchen equipment
3000
220
0.9
Dishwasher
1500
220
0.80
Disposal
500
220
0.9
Air-conditioning
14000
220
0.85
Power Factor
3. Design steps
a. Consider additional future loads of 10% of current total load capacity).
b. Calculate the total kVA required for the transformer (including the additional
future loads and the starting factor).
c. Use the typical ôandard Transformer Sizesàsee table below.
Standard Transformer Sizes (KVA)
3
30 112.5
6 37.5 150
9
45
225
15 75
300
d. Determine the primary and secondary currents of the transformer.
e. Determine the full load capacity in kW.
f.
Calculate the full load efficiency using the following assumption:
1. The core losses are equal to 600-W + XX-W; XX is your last two digits serial
number as posted in BB under EE306 common sections (e.g., 01, 04, 10, 14, 21
tc.)
2. The full load copper losses are equal to 900-W + Y-W; Y is your one digit section
number as posted in BB under EE306 common sections (e.g., 1, 2, 6 tc.)
g. Calculate the efficiency of at least 3 different loading scenarios of your own choice
(e.g., LDs1: Air Conditions & Lighting; LDs2: Laundry & Kitchen equipment; etc.)
h. Calculate the maximum efficiency of the transformer when operating at a
power
factor of 0.9
Submit a formal report indicating all detailed design and calculation
aspects.

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