Equipment Used in a Substation

A typical substation contains the following electrical equipment –

Power transformer – to change (rise/reduce) the voltage levels of the supply.

Circuit breakers – to turn on or off the power supply in the system.

Isolators – to add extra layer of electrical separation in power lines.

Current transformer – to reduce the high currents to lower values for measurement and protection.

Potential transformer – to reduce the high voltage to lower values for measurement and protection.

Busbars – to connect incoming and outgoing power lines with the substation.

Lightning arrestors – to protect the system from damages due to switching surges or lightening surges.

Insulators – to separate conducting parts from non-conducting parts.

Metering instruments – to monitor and display different readings.