Classification of Electrical
Substations
Electrical substations are classified according to existing
standards and regulations and technical documentation. Also
according to their requirements)
Most commonly used are:
Attached substation – an installation for reception,
conversion and distribution, directly adjoining the main
building of an industrial enterprise or a power station
Integrated substation – an installation for reception,
conversion and distribution, occupying a part of the
main building;
Workshop substation – an installation for reception,
conversion and distribution, which is located inside the
plant. This design doesn’t need casing;
Complete transformer station – an installation for
reception, conversion and distribution, which includes
transformers and other elements. It may be designed for
indoor or outdoor installation with one or two
transformers, with power ranging from 250 to 2500 KW;
Mast transformer station has an open construction. It is
set in a special design, providing a separate platform
for its service, which is placed at a certain height;
Pole-mounted transformer substation has an open design,
and all equipment is mounted on a pole carrying highvoltage line. The structure of pole-mounted transformer
substation includes: power transformer, high-voltage
arresters and safety devices and disconnecting switches.
Depending on connection to the electrical network – substation
are :
A dead-end substations – are powered by one or two high
voltage line ends;
Junction substation – connected to one or two highvoltage lines passing near;
Loop substation – can allow one system component, such
as a transformer or feeder cable, to fail without
causing a loss of service.
Nodal substation – to which are attached more or two
lines, coming from one or two stations
There are also other criteria of classification of electrical
substations. For example, depending on control method the
substation have i&C, RTU, PLS, LTC