Utility Distribution Systems Design Project

This design project is an extension of your midterm exam. Since I was unable to prepare

comments on each exam in a timely manner, all students will proceed as follows:

 a single two-transformer substation will be used to supply the transportation hub

 the substation will be fed initially from one of the 138 kV lines

 when the transportation hub load reaches 35 MW, the second 138 kV line will be tied

into the substation

 the 230 kV line will not be used to serve the transportation hub

1. Start your project by developing a year-by-year load forecast for the first 10 years of the

transportation hub. Start the load at 10 MW in year 1, growing to 50 MW in year 10. Assume a

load factor for each year. Assume an uncorrected power factor of 85% lagging.

2. Develop a plan for power factor correction. Show the plan projections year by year.

3. Draw a map showing the layout of your primary feeders. Assume a feeder loading of 10 MW

to be “fully loaded.” Decide how many feeders need to be built initially, and develop a plan

showing when new feeders will be needed. Also show ties (normally-open connections) between

the feeders. Specify the devices used to tie the feeders together.

4. Show the design of a typical secondary circuit. Specify the load per secondary circuit.

5. Assuming a demand cost of $10/kW and an energy cost of $[url removed, login to view], select a service

transformer to use based on the evaluation method you used on your midterm exam.

In addition to the requirements above, also

1. Develop a contingency switching plan for the loss of a feeder breaker.

2. Develop a contingency plan for loss of a substation transformer.

3. Identify feeder automation devices on your primary circuit map.

Skills: Electrical Engineering

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