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 high-voltage 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 high-voltage 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