Features and application
The station is designed as free-standing unit to be placed at locations suitable for recipients. The station is enclosed in reinforced concrete casing, consisting of the foundation with prefabricated side walls, and a roof.
The interior of the casing is divided into the following compartments:
-
transformer compartment
-
MV switchgear compartment
-
LV switchgear compartment
Access to each compartment is possible due to separate doors made of aluminium profiles with an additional layer of primer undercoat.
Container transformer substations in concrete casing for outside operation can work with MV cable network in ring and radial arrangement, as well as LV cable network.
They are used to supply power to:
- housing estates in cities
- parks and recreation areas
- suburban housing estates and villages
- construction sites
- industrial plants and craft workshops
Specification
| Station parameters |
Switchgear |
|
|
MV |
LV |
|
|
Rated voltage |
24 kV |
400 V |
|
Rated continuous current |
630 A |
2000 A |
|
Rated short-circuit current (1 s) |
16 kA |
16 kA |
|
Rated peak short-circuit current |
40 kA |
32 kA |
|
Rated frequency |
50 Hz |
|
|
Max. power of the transformer |
up to 1250 kVA |
|
|
Protection degree |
IP 43 |
|
Options
In the standard version, the station design allows to place in the transformer compartment a hermetic unit with a maximum power of 630 kVA.
As standard, STKBz stations have the following switchgears:
MV type:
- air-insulated XIRIA
- SF6 insulated – CGM COSMOS, RM6, SM6
- other after prior consultation with the manufacturer
LV type:
- RTE, RTEa, Fastline hanging switchgears
- RTL, RTLs wall-mounted, free-standing switchgears
- other after prior consultation with the manufacturer
These switchgears constitute independent elements inserted into the station, and they are operated from the outside, after opening the door of the relevant compartment.
Certificates and authorisations
The transformer station meets the requirements of the following standards:
-
PN-EN 62271-202:2010 High-voltage switchgear and controlgear: High-voltage/low voltage prefabricated substation
-
PN-EN 62271-200:2007 High-voltage switchgear and controlgear. Part 200: AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV.
-
PN-EN 62271-1:2009 High-voltage switchgear and controlgear. Part 1: Common specifications and related standards.
-
PN-EN 62271-201:2010 High-voltage switchgear and controlgear. Part 201: AC solid-insulation enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV.
-
PN-EN 60529:2003 Degrees of protection provided by enclosures (IP code)
