400 kV High Voltage Substation

Extra High Voltage

400 kV substations are the highest voltage level of the national transmission network.

230 kV High Voltage Substation

Power Transmission

230 kV substations are the interface between 400 and 132 kV substations.

132 kV High Voltage Substation

Sub-transmission

132 kV substations are the connection ring between transmission and distribution networks.

63 kV High Voltage Substation

Power Distribution

63 kV substations are the last ring of the high voltage network.

GIS Substation

Gas Insulated Switchgear

GIS substations with SF6 gas insulation occupy much less space.