Sub station
- It is a part of power system in which termination of transmission or distribution line and housing of switch gear and other electrical equipment including transformer.
- There are following types of substations.
Switching substation
- It is a substation which includes switch gear and bus bar but not included power transformers.
Transformer substation
- It is a substation which contain power transformer interconnecting two / more networks of different voltage level.
Step up substation
- It is a substation in which outgoing power from the transformer is at higher voltage than the incoming power.
Step down substation
- It is a substation in which outgoing power from the transformer is at lower voltage level than the incoming power.
Converter substation
- It is a substation in which alternating current is converted into direct current and vice versa.
Traction substation
- It is a substation whose function is to supply traction system.
Frequency converter substation
- It is a substation in which AC current at one frequency is converted into another frequency ( higher or lower than normal frequency ).
Ring substation
- It is a substation in which bus bar is formed closed loop with dis-connectors in series within the closed loop.
Mesh substation
- It is a substation in which bus bar is formed closed loop with circuit breaker in series with the closed loop.
Single bus bar substation
- It is a substation in which lines and transformers are connected to single bus bar only.
Double bus bar substation
- It is a bus bar in which lines and transformers are connected to two bus bars by means of bus bar selector switches.
Triple bus bar substation
- It is a bus bar in which lines and transformers are connected to three bus bars by means of bus bar selector switches.
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