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.