Question

3.7 A square area of 20,000 ft on a side has a load density of 2000 kVA/mile 0.9 lagging power factor is to be served from a 12.47 kV substation that is located at the center of the square. Two different plans are being considered for serving the area. The two plans are shown in Figure 3.28 Plan A proposes to break the a three-phase primary main consisting of 336/400 26/7 ACSR conductors, and the dotted lines will be the three- phase laterals consisting of 4/0 ACSR conductors. Both the main and laterals are constructed such that Deq 4.3795'. The three-phase laterals will be spaced every 500 ft. rea into four square areas and serve it as shown. The big black line will be the 1.5 mile 1.5 mile 1 mile! 2000 kVA FIGURE 3.27 Rectangular-triangular area of Problem 3.6 Plan A Plan B FIGURE 3.28 Two plans for Problem 3.7 Plan B proposes to serve the area with four triangularly shaped feeders. Again, the primary main is shown in the dark black line, and the laterals are spaced every 500 ft and shown as the dotted lines. The same conductors and Deq will be used in this plan. Determine the percent voltage drop to the "last customer" (points A and B) for the two plans. Note: For Problem 3.7, assume the length of main square is 20,000 ft. Then, find the number of laterals based on this and the fact that the distance between each lateral is 500 ft.

Answer 1

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