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A primary feeder model using small area demand locations to represent nonuniform loads, and feeder segments having variable distribution costs and limited capacities is formulated. The solution of problems having 1000 demand locations and 100 substations can be found in a fraction of a second by using a current fast upper bounded transshipment code. The problem of restructuring the solution to satisfy other kinds of constraints is also discussed.
Wall et al. (Tue,) studied this question.