Transformer, MV switchgear and LV board: equipment, enclosure and interfaces defined from the one-line diagram, site conditions and network operator requirements.
Tell us the product, approximate rating and your e-mail. We will review the requirement and identify any missing information. For voltages, delivery country and project details, use the full configurator.
Beyond the transformer alone, a delivery substation is the point where your private installation connects to the public MV grid. We supply it as a package: MV switchgear, transformer, LV board, metering, protection and enclosure, designed to the French NF C 13-100 framework and the distributor's requirements. Two forms: a prefabricated compact substation (concrete monobloc, factory-tested) or a substation built inside a building.
| Element | Prefabricated compact | In-building |
|---|---|---|
| Transformer | up to ≈ 1,000 kVA | up to 2,500 kVA and beyond |
| MV switchgear | 2 incomers + 1 protection (typical) | per operating scheme |
| Enclosure | concrete monobloc | masonry / modular |
| Metering | LV | LV or MV |
| Framework | NF C 13-100 | NF C 13-100 / NF C 13-200 |
| Delivered lead time | per the agreed project schedule | per project |
Exact configuration depends on the DSO and the applicable NF text, confirmed at quotation, specifications validated with the factory.
| Variant | What changes | Where it fits |
|---|---|---|
| Standard configuration | One incomer, one protection, one transformer, one main LV board | Connecting a single site |
| Twin transformer | Two units in the same enclosure, LV coupling per operating scheme | Redundancy, staged capacity growth |
| Withdrawable LV ways | Drawer-type main board instead of fixed outgoing ways | Servicing one way without a general shutdown |
| LV board as control cubicle | Variable-speed drives, soft starters and motor protection built into the board | Process industry, pumping, ventilation |
These variants combine. State yours at enquiry stage: it drives the enclosure footprint and the operating scheme more than the rating does.
More than the transformer, the medium-voltage cubicles set the substation's architecture and its lead time. Three functions combine: a switch-disconnector (IM) to connect, a switch + fuses (QM) to protect a distribution transformer compactly, a circuit breaker (DM) with a digital relay beyond the fuse range or where selectivity must be adjustable. The cubicle count then follows the scheme: one incomer in single feed, or two incoming cubicles on an MV ring — a choice that follows the local network and NF C 13-100, not a preference.
For EU medium-voltage switchgear up to and including 24 kV, Regulation (EU) 2024/573 addresses putting into operation from 1 January 2026, with specified derogations. The breaking medium and insulation medium must both be checked against the project requirements. Article 13
The substation is not one product but an assembly, and each part answers to its own text: NF EN 60076 for the transformer, IEC 62271-200 for the medium-voltage switchgear (service continuity LSC2A or LSC2B, PM partitioning, internal-arc classification IAC AFLR with its kA/s value fixed for your room), IEC 61439-2 with design verification for the low-voltage assembly, and IEC 62271-202 where the whole comes prefabricated. In France the installation framework on top of this is NF C 13-100.
In practice, once demand exceeds what the local LV network can deliver (often around 250 kVA), the distributor directs you to an MV connection with a delivery substation. The threshold is set by the DSO at the connection-request stage.
A prefabricated compact substation arrives factory-tested, which shortens site work; it suits ratings up to ≈ 1,000 kVA. Larger or bespoke schemes are built in-building. We quote the fitting option for your project.
We supply the equipment documentation, drawings, test reports, declarations, that feeds your connection file. The connection request itself follows the DSO's own calendar; starting it early is the best way to avoid a finished substation waiting for power.
| Scope | What the quotation needs to define |
|---|---|
| Enclosure | Concrete, metal or in-building arrangement is subject to the specification, manufacturing route and supporting evidence. A metal alternative needs the client’s approval. |
| Equipment and factory work | Transformer, switchgear, LV board, internal links and factory tests are itemised in the quotation. |
| Cable links between substations | Separate scope: route length, cable quantities per phase, conductor and screen ratings, fault current, clearing time, ducts and terminations must be checked against the interfaces at both ends. |
| Site work | Civil works, ducts, unloading, lifting, earthing, cable pulling, terminations, testing and commissioning are assigned explicitly to each party. |
| Documents and acceptance | Component reports do not by themselves demonstrate the complete assembly. The agreed dossier identifies applicable assembly verifications, drawings, routine tests and any type-test evidence. |
| Delivery and programme | Delivery point, Incoterm, import responsibilities and a project schedule are confirmed in writing. A generic transformer lead time does not establish a complete substation schedule. |
For EU MV switchgear up to and including 24 kV, the F-gas rules concern putting equipment into operation from 1 January 2026, with specified derogations. We study fluorinated-gas-free insulation with suitable switching technology. Vacuum interruption alone does not establish that insulation is SF6-free. Regulation (EU) 2024/573, Article 13.
Configurator in “Substation (MV/HV)” mode: switchgear, metering, enclosure, validated with the factory.
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