Electric power distribution
Electric power distribution is the delivery system of electricity to places that use it, such as homes and other buildings. It is done mainly by power lines, transformers, substations and meters. The electricity comes from the power station at high voltage and is delivered at medium to low voltage levels.
In early days, electricity was distributed as direct current (DC). Alternating current (AC) was later introduced during the War of Currents. DC distribution disappeared because transformers can easily convert AC to high voltage for electric power transmission and low voltage to use at home.
Configurations
- Radial network
- Loop network
Electric Power Distribution Media
A 50 kVA pole-mounted distribution transformer
General layout of electricity networks. The voltages and loadings are typical of a European network (in Canada, for example, Extra High Voltage can mean 735kV.)
The late 1870s and early 1880s saw the introduction of arc-lamp lighting used outdoors or in large indoor spaces, such as this Brush Electric Company system installed in 1880 in New York City.
Substation near Yellowknife, in the Northwest Territories, Canada
High voltage power pole in rural Butte County, California
World map of mains voltage and frequencies
Japan's utility frequencies are 50 Hz and 60 Hz.
