ABSTRACT
Radial distribution feeders are characterized by having only one path for power to ºow from the source (distribution substation) to each customer. A typical distribution system will consist of one or more distribution substations consisting of one or more “feeders.” Components of the feeder may consist of the following:
• ree-phase primary “main” feeder • ree-phase, two-phase (“V” phase), and single-phase laterals • Step-type voltage regulators or load tap changing transformer (LTC) • In-line transformers • Shunt capacitor banks • ree-phase, two-phase, and single-phase loads • Distribution transformers (step-down to customer’s voltage)
e loading of a distribution feeder is inherently unbalanced because of the large number of unequal single-phase loads that must be served. An additional unbalance is introduced by the nonequilateral conductor spacings of the three-phase overhead and underground line segments.
