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Consider the square-shaped distribution substation given in Example 4.10. The dimension
of the area is 2 × 2 miles and served by a 12,470 V (line-to-line) feeder main and laterals.
The load density is 1200 kVA/mi2 and is uniformly distributed, having a lagging power factor
of 0.9. A young distribution engineer is considering selection of 4/0 copper conductors with 19 strands and 1/0 copper conductors, operating 60 Hz and 50°C, for main and laterals,
respectively. The geometric mean distances are 53 in. for main and 37 in. for the lateral. If the
width of the service area of a lateral is 528 ft, determine the following:
a. The percent voltage drop at the end of the last lateral, if the laterals are also three-phase
four-wire wye grounded.
b. The percent voltage drop at the end of the last lateral, if the laterals are single-phase twowire
wye grounded. Apply Morrison’s approximation. (Explain what is right or wrong in
the parameter selection in the problem mentioned earlier.) Any suggestions?