# electrical engineering

I have project in Electrical engineering course which is Power SystemYou have to use Easy Power Program Check for the file which is bellow the page it will show you everything if there is anything not clear please ask me
b2najcxhbddkltriddljvmz4eke_eegr424_course_project_copy.pdf

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EEGR424
Course Project
Fall 2017
Project is due via e-mail by December 11, 2017. 11:30 pm. Later submission will not be accepted.
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EEGR424
Course Project
Fall 2017
Project is due via e-mail by December 11, 2017. 11:30 pm. Later submission will not be accepted.
A switchgear in commercial building is fed from the utility through 750 kVA transformer during normal
operating condition. If the utility power is not available, a 600 kVA standby generator provides the
power to the switchgear through an Automatic Transfer Switch (ATS) that has a published short circuit
interrupting rating of 14-kAIC at 480V. The utility, transformer and the generator data is given below:
Utility Fault Current Data:
3-phase short circuit: 7.5 KA . X/R = 10
Single-line-to ground short circuit: 6.85 KA. X/R = 10
Transformer Data:
Primary Voltage: 13.8 kV – Delta
Secondary Voltage: 480V  Wye solidly grounded
Transformer Impedance: 5.75%
Generator Data
Generator Rating
Subtransient Reactance Xdv
600 kVA
4.2 %
Transient Reactance Xdv:
11.2 %
Zero Sequence Reactance X0v
4.6 %
Synchronous Reactance Xd
Direct axis sub-transient short
circuit time constant Td
Direct axis sub-transient short
circuit time constantTd
Armature time constant Ta
210.4 %
0.12 s
0.10 s
0.021 s
The feeder length from the transformer secondary to the ATS is 15 feet, Copper
The feeder length from the generator bus to the ATS is 45 feet, Aluminum with 2 runs per phase 600
kcmil.
The feeder length from the ATS to the switchgear is 20 feet, Copper with 3 runs per phase 500 kcmil.
The switchgear has the following connected loads:
Load 1: 250 hp induction motor fed through 65 feet long Copper feeder. Motor power factor and
efficiency are 85 % and 90%, respectively.
Load 2: 75 hp motor fed through 155 feet long, #6 AWG, Aluminum feeder. Motor power factor and
efficiency are 79% and 88 percent, respectively.
1. Draw the one-line diagram using the Easy Power software and e-mail me the electronic file. (15
points)
2. Hand calculate the transformer full load ampere at 480V secondary (5 points)
3. What size feeder do you recommend from the transformer secondary side to the ATS? (5 points)
EEGR424
Course Project
Fall 2017
Project is due via e-mail by December 11, 2017. 11:30 pm. Later submission will not be accepted.
4. Perform power flow analysis when the switchgear is fed from the transformer and provide the
following results:
a.
Real power (KW) and reactive power (kVAR) flowing in the feeder from the ATS to the
switchgear. (6 points)
b.
What is the real power (kW) absorbed by the 250 hp motor, and what is the motor
power factor? (6 points)
c.
Are the feeders to the 250 hp and 75 hp motors overloaded? If yes, by what
percentage? (5 points)
5. A 100 kVAR capacitor bank is connected to the switchgear bus via a #1 AWG, Copper, 15 feet
feeder. What is the real power (kW) and power factor on the feeder to the switchgear? (6
points)
6. With the 100 kVAR capacitor bank connected to the switchgear bus and, a three-phase bolted
fault occurred at the 750 kVA transformer secondary side bus. Provide the following:
a) Fault magnitude on the transformer secondary bus in KA. (5 points)
b) Fault contribution from the transformer in KA. (5 points)
c) What is the fault magnitude at the switchgear bus in KA ? (5 points)
Generator Mode:
7. When the switchgear is fed from the generator, perform short circuit analysis, and provide the
following:
a) Fault contribution from the generator in KA. (7 points)
b) Fault magnitude on the ATS in KA. (7 points)
c) What is the fault magnitude at the switchgear bus in KA. (5 points)
d) Comparing the ATS published AIC interrupting rating to the 3-phase bolted fault on the
ATS, is the ATS overdutied, and if yes by what percentage? (8 points)
e) Is it safe to use the ATS based on findings in d) above? What do you recommend? (10
points)

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