Table below shows the 15-minute kW demands for four customers between the hours of 17:00 and 21:00. A 25 kVA single-phase transformer serves the four customers. Time Cust #1 Cust #2 Cust #3 Cust #4 kW kW kW kW 17:00 8.81 4.96 11.04 1.44 17:15 2.12 3.16 7.04 1.62 17:30 9.48 7.08 7.68 2.46 17:45 7.16 5.08 6.08 0.84 18:00 6.04 3.12 4.32 1.12 18:15 9.88 6.56 5.12 2.24 18:30 4.68 6.88 6.56 1.12 18:45 5.12 3.84 8.48 2.24 19:00 10.44 4.44 4.12 1.12 19:15 3.72 8.52 3.68 0.96 19:30 8.72 4.52 0.32 2.56 19:45 10.84 2.92 3.04 1.28
Table below shows the 15-minute kW demands for four customers between the hours of 17:00 and
21:00. A 25 kVA single-phase transformer serves the four customers.
Time Cust #1 Cust #2 Cust #3 Cust #4
kW kW kW kW
17:00 8.81 4.96 11.04 1.44
17:15 2.12 3.16 7.04 1.62
17:30 9.48 7.08 7.68 2.46
17:45 7.16 5.08 6.08 0.84
18:00 6.04 3.12 4.32 1.12
18:15 9.88 6.56 5.12 2.24
18:30 4.68 6.88 6.56 1.12
18:45 5.12 3.84 8.48 2.24
19:00 10.44 4.44 4.12 1.12
19:15 3.72 8.52 3.68 0.96
19:30 8.72 4.52 0.32 2.56
19:45 10.84 2.92 3.04 1.28
20:00 6.96 2.08 2.72 1.92
20:15 6.62 1.48 3.24 1.12
20:30 7.04 2.33 4.16 1.76
20:45 6.69 1.89 4.96 2.72
21:00 1.88 1.64 4.32 2.41
1. For each of the customers determine:
a) Maximum 15-minute kW demand
b) Average 15-minute kW demand
c) Total kWh usage in the time period
d) Load factor
2. For the 25-kVA transformer determine:
a) Maximum 15-minute diversi ed demand
b) Maximum 15-minute noncoincident demand
c) Utilization factor (assume unity power factor)
d) Diversity factor
e) Load diversity
3. Plot the load duration curve for the transformer
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