A 12.47 kV, three-phase distribution feeder is 2.1 miles long and can wheel up t

Question

A 12.47 kV, three-phase distribution feeder is 2.1 miles long and can wheel up to 5 MVA. Oriole conductors were hung using an equilateral triangular spacing scheme, with conductor spacing of only 6 inches. Considering the very narrow spacing between conductors, determine whether a short t-line model is sufficient to represent the feeder or if a medium model is required. Do so by comparing the ABCD coefficients for each model, expressed in SI units. Assume a 25 degree C operating temperature. Using the most appropriate model, calculate the voltage regulation when a rated load with 0.95 lagging power factor is attached.

Explanation / Answer

1.the short t-line model is sufficient to represent the feeder 2. Overall voltage would be 725KV

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