# The load density is 1200 kVA/mi2 and is uniformly distributed, having a lagging power factor of…

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?