Features and application
MV cable connections in externally-operated concrete casing can work with MV cable network in ring and radial arrangement.
The connection is designed as free-standing unit to be placed at locations most suitable for recipients.
The casing is made as a reinforced concrete prefabricate, optionally developed as two transport elements: the foundation with a body and a roof, or one element constituting a uniform system of walls, roof, and foundation.
The main element of the connection is 3-, 4-, or 5-bay MV switchgear with SF6 or vacuum insulation, placed inside the casing. The switchgear is operated from the outside, after opening the aluminium door.
Specification
| Connection parameters | |
|
Rated voltage |
24 kV |
|
Rated continuous current |
630 A |
|
Rated short-circuit current (1 s) |
16 kA |
|
Rated peak short-circuit current |
40 kA |
|
Rated frequency |
50 Hz |
|
Protection degree |
IP 43 |
Options
MV switchgears used in ZSNB connections:
SF6 insulation:
- RM6
- CGM COSMOS
- 8DJ10/20
- SafeRIng
Vacuum insulation:
- XIRIA
It is possible to use other MV switchgear.
Certificates and authorisations
The transformer station meets the requirements of the following standards:
-
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.
