Substation design
The final design of the substations will often be influenced by the site selected. We work with the community to implement a design option that meets their needs and concerns where possible.
| Substation type (all are zone substations) |
Description |
Typical cost | Approximate site dimensions |
|---|---|---|---|
| Air Insulated Switchgear (AIS) |
Largest substation area, overhead connections to high voltage lines. Comprises of outdoor equipment and a number of switchroom buildings. Height of outdoor equipment can be up to 6m (excluding lightning mast, communication towers and gantries for line entries). |
$16 - 18 million |
Maximum: 110 m x 110 m with buffer zone Minimum: 100 m x 100 m with no buffer |
|
Hybrid |
A combination of open and enclosed equipment. Takes up less area than AIS and can accommodate overhead or underground connections to high voltage powerlines. Height of outdoor equipment remains 6m. |
$22 - 25 million |
Maximum: 90 m x 60 m with buffer zone Minimum: 80 m x 50 m with no buffer |
|
Gas Insulated Switchgear (GIS) |
These are normally enclosed in a building. They enable the most compact substation design but cost will vary on whether equipment is indoors or outdoors. |
$22 - $26 million |
Maximum: 70 m x 50 m Minimum: 65 m x 35 m indoors |
Note: Figures quoted above are indicative only. Please note that there are a number of other factors which influence cost including location, line entries, configuration, and various other technical factors.
