Consider a 12.47 kV three-phase four-wire grounded-wye overhead radial distribution…

Consider a 12.47 kV three-phase four-wire grounded-wye overhead radial distribution system,similar to the one shown in Figure 5.32. The uniformly distributed area of 12 × 10 =120 – block area is served by one main located in the middle of the service area. There are 10laterals (6 blocks each) on each side of the main. The lengths of the main and the laterals are3300 and 5760 ft, respectively. From Table A.1, arbitrarily select 4/0 copper conductor with12 strands for the main and AWG # 6 copper conductor for the lateral. The K constants for themain and lateral are 0.0032% and 0.00175% VD per kVA-min, respectively. If the maximumdiversified demand per lateral is 518.4 kVA, consider the total service area and determine thefollowing:a. The total load of the main feeder in kVA.b. The amount of current in the main feeder.c. The amount of current in the lateral.d. The percent voltage drop at the end of the lateral.e. The percent voltage drop at the end of the main.f. The total voltage drop for the last lateral. Is it acceptable if the 4% maximum voltagedropcriterion is used?

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