OBJECTIVES: On completion of EE 455, the student will be able to do the following

1

Observe a typical distribution substation and sketch a diagram showing the location of all major pieces of equipment.  Label and identify as much as possible.

2

Analyze various three-phase distribution transformer connections and the effect of unbalance on the transformer winding ratings.  Find the high-voltage and low-voltage currents for the open wye/open delta configuration.

3

Determine the maximum load that can be supplied by a parallel-connected transformer configuration.

4

From typical daily demand curves for each load type, find the maximum diversified demand, demand factor, utilization factor, load factor, coincident factor, and loss factor.

5

Using concepts of distribution voltage regulation, design a suitable shunt capacitance scheme (both location and rating) to improve voltage regulation in a typical distribution system.  Find also the loss reduction due to the capacitor placement.

6

Develop code to perform a three-phase power flow for a radial distribution system.  Form impedance matrices of distribution lines, given the line configuration and physical characteristics.

7

Analyze distribution system fault currents for three phase, LL, LG, and LLG faults. Derive the relevant equations for a double-line-to-ground (LLG) fault using phase coordination method.

8

Apply the basic rules of distribution protection in selecting the proper protection devices at the coordinating points to (a) carry normal load current and (b) respond properly to a fault in a typical distribution system.

9

Compute basic reliability indices for a radial distribution feeder; assess power quality of voltage and current waveforms.