Electrical Overhead Primary Distribution System

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Electrical overhead primary distribution system.

An overhead power line is a structure used in electric power transmission and distribution to transmit electrical energy across large distances. Primary distribution lines carry this medium voltage power to distribution transformers located near the customer s premises. The system of lines and circuits supplying energy to the secondary distribution system at a higher voltage is the primary distribution system. Electric power distribution is the final stage in the delivery of electric power.

The main function of an electrical power distribution system is to provide power to individual consumer premises. Overhead topology e g. The primary function of the electric power distribution system in a building or facility is to receive power at one or more supply points and to deliver it to lighting elevators chillers motors and all other electrical loads. Typical electrical distribution system.

The most common distribution system consists of simple radial circuits feeders that can be overhead underground or a combination. Opacity some distribution feeder attributes. Distribution substations connect to the transmission system and lower the transmission voltage to medium voltage ranging between 2 kv and 35 kv with the use of transformers. The distribution of electric power to different consumers is done with a much lower voltage level compared to the transmission of power over long distances i e.

How distribution systems are different than transmission systems 1. The secondary distribution employs 400 230 v 3 phase 4 wire system. Overhead electric line construction with details. Radial loop network sectionalizing options circuit length load density.

It consists of one or more uninsulated electrical cables commonly multiples of three for three phase power suspended by towers or poles. It is that part of ac distribution system which includes the range of voltages at which the ultimate consumer utilizes the electrical energy delivered to him. It carries electricity from the transmission system to individual consumers. Energy transmitted at the voltage at which it is used is known as secondary distribution.

Distribution transformers again lower the. From the distribution substation feeders carry the power to the end customers forming the medium voltage or primary network operated at a medium voltage level typically 5 35 kv. Since most of the insulation is provided by the surrounding air overhead power lines are generally the least.