GPZ (main power supply station) is a power station which supplies the MV grid, composed of HV and MV switchgear and power transformers.
ZPUE S.A. provides in its offer solutions dedicated to such specialised facilities, as a manufacturer of MV and LV switchgears and prefabricated concrete enclosures. One of such solutions is modular, compartmentalised MV switchgears for primary circuits, with high short-circuit strength. Compartmentalisation of the switchgear and a series of protections and interlocks ensure high safety and ease of operation. Another solution is LV switchgear used to supply station auxiliaries, such as control rooms, battery rooms etc.
A wide range of prefabricated concrete enclosures allows ZPUE S.A. to manufacture even very complex substation designs. Many years of experience with complex projects based on prefabricated concrete components and preparation of the station in the factory prevents assembly errors during installation at the facility. Station installation time at the facility is minimised to just a few days even in very complex projects. Moreover prefabrication of concrete modules enables repeatability of projects, which significantly reduces time and expenses.
MV primary distribution substation
|1||Walls, 120 mm thick - standard, 90 mm - optional|
|Solid walls - fire integrity class REI 120|
|3||Doors: solid or with ventilation louvres, without fire integrity class 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 cover|
Each HV/MV GPZ has a transformer with a power of a few to a few dozen MVA. The transformers, filled with mineral oil insulation may create a significant environmental hazard in case of a failure. When designing and placing the transformer solutions which prevent oil from seeping into the ground have to be used.
Taking this into account, ZPUE S.A has introduced into its offer a range of prefabricated reinforced concrete foundations, on which power transformers are placed. In case of a transformer failure the leak of burning oil is extinguished, and then collected in the foundations which form an oil-tight sump.
The complete structure is formed by connected foundation basins, which form a system of connected vessels. Foundation basins are made of C35/45 concrete. Each of the foundation basins is covered by a prefabricated reinforced concrete slab and perforated steel platform panels. Perforated steel panels are intended to allow rainwater and transformer oil to drain into the foundation basins, collecting environmentally hazardous liquid.
High power transformers are placed on railway rails. Normal track S49 railway rails are placed on the walls of the centre foundation. Due to the significant weight of the transformer its placement at the centre of the substation is performed by sliding.
The view of the system foundation for power transformers
The steel frame is not included in the ZPUE S.A. offer.