1. A single-phase lateral serves four transformers as shown in Figure. 1. Assume that each customer's maximum demand is 15.5 kW + j7.5 kvar. The impedance of the single-phase lateral is z = 0.4421 + j0.3213 2/1000 ft. The four transformers are rated as T1 and T2: 37.5 kVA, 2400-240 V, Z = 0.01 + j0.03 per unit T3 and T4: 50 kVA, 2400-240 V, Z = 0.015 + j0.035 per unit Use the DF's in Table 1 and determine the following: (a) Determine the total 15 min maximum diversified kW and kvar demands on each transformer. (b) The 15 min maximum diversified kW and kvar demands for each line section. (c) If the voltage at node 1 is 2600/0 V, determine the voltage at nodes 2 through 9. In calculating the voltages, take into account diversity using the answers from (a) and (b). (d) Take the maximum diversified demand from node 1 to node 2 and "allocate" that to each of the four transformers based on their kVA ratings. To do this, take the maximum diversified demand and divide it by 175 (total kVA of the four transformers). Now multiply each transformer's kVA rating by that number to give how much of the total diversified demand is being served by each transformer. Again, calculate all the voltages. (e) Compute the percent differences in the voltages for parts (c) and (d) at each of the nodes using part (c) answer as the base.

Solved: 1. A single-phase lateral serves four transformers as shown in Figure.

Home
questions and answers
1 a single phase lateral serves four transformers as shown in figure 1

Question

1. A single-phase lateral serves four transformers as shown in Figure. 1. Assume that each customer's maximum demand is 15.5 kW + j7.5 kvar. The impedance of the single-phase lateral is z = 0.4421 + j0.3213 2/1000 ft. The four transformers are rated as T1 and T2: 37.5 kVA, 2400-240 V, Z = 0.01 + j0.03 per unit T3 and T