A distribution substation bus supplying two loads, Customer I and Customer 2 is shown in Figure 1. The utility specifies a 30-minute demand interval. Assume there are 730 hours in a month. TI Substation 20 MVA bus 6% X Customer 1 30-min Dua = 15 MW / month SCC = 100 MVA Energy use - 500 MWh / month Total connected demand = 18 MW Customer 2 T2 10 MVA 2% X Figure 1 a) Determine the demand factor, load factor and utilization factor for Customer 1.

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Q1) A distribution substation bus supplying two loads, Customer 1 and Customer 2 is shown
in Figure 1. The utility specifies a 30-minute demand interval. Assume there are 730
hours in a month.
TI
Substation
20 MVA
bus
Customer 1
6% X
30-min Dmar- 15 MW/ month
Energy use - 500 MWh / month
Total connected demand = 18 MW
SCC = 100 MVA
Customer 2
T2
10 MVA
2% X
Figure 1
(a) Determine the demand factor, load factor and utilization factor for Customer 1.
(b) Suppose a three-phase short circuit fault occurs at Customer 2. Calculate the percentage
voltage dip experienced by Customer 1. Use a power base of 50 MVA in your
calculations.
(c) To reduce the impact of voltage dip in part (b), Customer 1 is given three options to
consider:
i Connecting a similar transformer in parallel to TI.
ii. Connecting a similar transformer in parallel to T2.
iii. Connecting a new generator rated 50 MVA, 2% X at substation bus.
Indicate which option will help to reduce the impact of voltage dip at Customer 1.
Justify your answer.
Transcribed Image Text:Q1) A distribution substation bus supplying two loads, Customer 1 and Customer 2 is shown in Figure 1. The utility specifies a 30-minute demand interval. Assume there are 730 hours in a month. TI Substation 20 MVA bus Customer 1 6% X 30-min Dmar- 15 MW/ month Energy use - 500 MWh / month Total connected demand = 18 MW SCC = 100 MVA Customer 2 T2 10 MVA 2% X Figure 1 (a) Determine the demand factor, load factor and utilization factor for Customer 1. (b) Suppose a three-phase short circuit fault occurs at Customer 2. Calculate the percentage voltage dip experienced by Customer 1. Use a power base of 50 MVA in your calculations. (c) To reduce the impact of voltage dip in part (b), Customer 1 is given three options to consider: i Connecting a similar transformer in parallel to TI. ii. Connecting a similar transformer in parallel to T2. iii. Connecting a new generator rated 50 MVA, 2% X at substation bus. Indicate which option will help to reduce the impact of voltage dip at Customer 1. Justify your answer.
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