The WST type substation may be used in every situation where the placement of typical transformer substations is not possible due to architectural constraints. Since it occupies a very small area, it fits perfectly into landscapes of old towns, markets and squares surrounded by dense, old buildings, and it has a stylised façade which enables adapting it to the architecture of existing buildings.
The station is a building composed of four monolithic reinforced concrete castings with a circular cross-section, which include: foundations, main structure with MV and LV switchgears, main structure with transformer chamber, and roof.
|Substation height is specified as total above the ground level, with concrete roof|
Placement of equipment
|1||Walls, 130 mm thick — standard
Fire integrity class REI 120
|2||Ventilation grating IP 23D - standard, IP 43 - optional|
|3||Doors: solid or with ventilation louvres without fire integrity IP 23D - standard, IP 43 - optional
Doors with fire resistance e.g EI 60 or EI 120 - optional
|5a||AMI cabinet / Smart Grid / telemetry / auxiliary|
|7||Cable duct hatch door|
|8||Hatch / ladder to the transformer chamber|
Technical parameters / configuration possibilities
|Mass / Area|
|Foundation||3 600 kg|
|Switchgear structure||5 200 kg|
|Transformer structure||5 100 kg|
|Concrete roof||1 500 kg|
|Metal roof||350 kg|
|Usable area||3,46 m2|
|Technical parameters / configuration possibilities|
|Transformer* (4) Maximum power / dimension||630 kVA / 950 x 1400 x 1650 [mm]|
|Internal arc resistance classification||IAC-AB-20 kA-1s|
|Electrical parameters of switchgears||MV||LV|
|Rated voltage||up to 25 kV||up to 0,69 kV|
|Rated current||630 A||up to 1250 A|
|Rated short-time withstand current||up to 25 kA (1s)||up to 25 kA (1s)|
|Rated peak withstand current||up to 63 kA||up to 55 kA|
|Switchgear**||Type||Maximum number of bays|
|LV (5)||RN-W||12 (for TPM Kompakt - LLTL or TPM C - LTL)|
|MV (6)||TPM Kompakt||4 (LLTL)|
* Transformer inserted from above, before the roof is attached.
** Detailed selection of switchgears and their equipment is listed in chapters dedicated to individual devices in the catalogue. Example layouts of switchgears and corresponding substation configurations are specified in parentheses. The possibility of installing other types and configurations of switchgears should be arranged every time with the substation manufacturer.