Figures 11.Polyphase three-phase electrical systems
223
Electricity taken from the National Grid appropriately located sub-
stations which eventually transform the voltage down 11kV local
sub-station.
Generation at
25kV
Transmission
on Supergrid
at
400 and
275kV
Distribution
around
area companies at
132kV
Primary distribution
to local substations
supplying industrial
and commercial
consumers at
11kV
Generation
and
transmission
of electricity
Distribution
of
electricity
Transformer
Small industrial
and domestic
consumers at
400V/230V
FIGURE 11.2
Transmission line steel pylon.3 and 11. the local sub-station the neutral conductor formed for
single-phase domestic supplies and three-phase supplies shops, offices
and garages.3
Generation, transmission and distribution electrical energy.
FIGURE 11.4 give over-
view the system from power station consumer. These supplies are usually underground radial supplies from
the local sub-station, but rural areas still see transformers and over-
head lines suspended wooden poles.
