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.
SAFETY
- 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
RELIABILITY
- 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
EFFICIENCY
- 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
SUSTAINABILITY
- 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
CONTINUOUS INNOVATION
- 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
STANDARDS
- 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.
- Direct MV and LV interconnections.
- Self-supportingframe.
- Earthing circuitconnection.
- Lighting and auxiliary services circuit.
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