In 1998 Ormazabal introduced its range of compact prefabricated transformer substations, to be installed at ground level miniBLOK or underground miniSUB, both consisted of MB electrical compact equipment assembly.
Since then the compact prefabricated transformer substations have continuously evolved with enhanced performances, being adapted to the needs of the MV distribution network.
miniSUB is a Compact Prefabricated Transformer Substation, installed underground, with reduced dimensions, standard-built, tested and supplied from the factory as a unit.
It is characterised by incorporating an Ormazabal MB Medium Voltage associated type (A) compact equipment assembly, for use in both public and private distribution networks up to 36 kV.
miniSUB prefabricated transformer subtation is used into several Distribution Network Solutions (DNS) for utilities (public distribution, smart grids..) and end users (infrastructures, industry, tertiary).
Its careful exterior design and reduced dimensions minimiseits visual impact, making it suitable when the available space islimited, in industrial and residential areas as well as historical landmarks.
The main advantage of these Transformer Substations is their high safety and protection for both people and property against internal faults, their IAC classification, as well as their robustness and reliability.
Currently over 2,000 miniSUB have been installed worldwide.
High personnel safety against internal arcs, accidental direct contact, touch and step voltage
Equipotential operating surface
No access to live parts
Dielectric liquid collection pits
Test performed on the MB as an individual unit and as a whole assembly in the miniSUB
Fully factory-assembled and equipped (enclosure, switchgear, transformer and internal earthing circuit)
Product tested as a unit
Fast changes of electrical equipment
Suitable for limited space areas
Simple installation, limited to the introduction of the enclosure in the excavation and the connection of the cables
Ventilation: natural air circulation (class 10). Horizontal (H) or vertical (V) types
Easy to transport due to its reduced dimensions AND WEIGHT
MV and LV cables input/output through sealed feedthroughs
Impermeability and sealing
Minimum visual, environmental and acoustic impact
Reduced size and versatility
Low risk of insulator spillage on the public roads, with no harm to the environment
Great capacity for integration to the environment
Ideal for use in public distribution networks up to 36 kV
Smart-Grids ready substation
Ventilation modelling and testing optimized with Ormazabal transformers
EN 50532 Compact Equipment Assembly (CEADS)
IEC -EN 62271-202 High Voltage Switchgear: Prefabricated Transformer Substations
On Request: Specific regulations of the Utility. Applicable local regulations
Monoblock concrete enclosure (base and walls) with removable roof.
MB associated compact equipment assembly:
Fully gas insulated Medium Voltage Switchgear: CGMCOSMOS-2LP up to 24 kV or CGM.3-2LP up to 36 kV. Electrical diagram (RMU) with 2 feeder functional units, input and output, and a protection functional unit with a switch-fuse combination.
Ormazabal protection, control and metering units (remote control, telemetering, integrated control, telemanagement, etc.).
Medium Voltage Distribution Transformer, 250, 400 or 630 kVA
LV Switchgear: Low Voltage board with control and protection unit, as well as an auxiliary safety supply.