In case the “conventional, on-ground” station cannot be placed owing to architectural limitations, the only solution is underground stations. The underground transformer station is a leakproof, monolithic concrete container adapted to be placed under the ground, with medium and low voltage switchgears installed inside. MV (TPM, Rotoblok SF) and LV (RN-W) switchgears are independent elements of the station. The station can be installed on the pavement, square, etc.
Bilges between two floors allow for proper functioning even when surface rain water leaks through the ventilation holes. Water-proof cable glands and tight concrete housing ensure reliable and long-term work of the station.
Station type PST-b 20/630
Diagram of the standard station type PST-b 20/630
|Type||MV bay number
|MV switchgear||TPM||up to 4|
|LV switchgear||RN-W||up to 12|
|Transformer power||up to 630 kVA|
|Housing class - 20|
|main body:||25 000 kg|
|usable area:||12,32 m2|
|Ur||- Rated voltage||up to 36 kV||up to 1000 V|
|Ir||- Rated current||up to 4000 A||up to 6300 A|
|IK||- Rated short-time withstand current||up to 40 kA (3s)||up to 105 kA (1s)|
|IP||- Rated peak withstand current||up to 100 kA||up to 231 kA|
|fr||- Power frequency withstand||50/60 Hz|
|Maximum transformer power||up to 4000 kVA|
|Protection degree||IP23D up to IP43 (IP54)|
Stations have been examined with regard to existing standards in accredited European laborato-ries.
Compliance with the standards
- PN-EN 62271-202 - High-voltage switchgear and controlgear - Part 202: High-voltage/ low-voltage prefabricated substation;
+ related norms
Localization of the station due to fire safety requirements
The mounting area of the station should be chosen in accordance with the regulation of the Minister of Infrastructure of 12 April 2002, with regard to the technical requirements of buildings localization (Journal of Laws of 15 June 2002, No 75, item 690, with later changes) or local regulations.
Individual cases of localization/placing of the station should be considered on an individual basis and consulted with ZPUE S.A. or with other authorized services (opinion given by fire protection officer).