Packaged substation
- Prefabricated integration: high-voltage side, transformer, and low-voltage distribution pre-assembled as one unit, lifted into place as a whole
- Outdoor protection: sealed enclosure, ventilation and heat dissipation, anti-condensation, built for long-term outdoor operation
- High- and low-voltage coordination: high-voltage incoming, metering, and low-voltage feeders configured to project design
- Custom-built to design: capacity, vector group, and number of outgoing circuits customized per project
- Fast energization: connect the high-voltage cable and low-voltage outgoing cables on site to commission, saving civil construction schedule
Specifications
The table below covers 80% of factory distribution room cases. Anything outside it we can still build — those are engineered items, quoted separately, with an indicative price the same day.
| Box Type | Prefabricated (European-style) package substation, three-compartment layout: high-voltage room + transformer room + low-voltage room |
|---|---|
| Standard dimensions | Custom-built to capacity and circuit count; typical 3.0–5.0 m long × 2.2–2.5 m deep × 2.4–2.6 m high |
| Enclosure construction | Cold-rolled steel sheet / aluminum-zinc coated steel sheet + structural steel frame, welded or bolted assembly, lifted into place as one unit |
| Surface treatment | Derusting → primer → topcoat, outdoor-grade weather-resistant paint, optional anti-condensation and insulation |
| IP rating | IP23 / IP33 / IP54 selected per installation environment, enclosure fully sealed |
| Heat dissipation and ventilation | Transformer room with natural ventilation + louvers, with fans or ventilation louvers added where required |
| Cable entry | High-voltage cable incoming, low-voltage cable outgoing, bottom or side cable entry points with seals |
| Door and lock | Multi-point door locks, independent doors for high- and low-voltage rooms, sealed door gaps |
| HV side | Load break switch / disconnect switch + fuse combination, or high-voltage circuit breaker (selected per scheme) |
|---|---|
| Transformer | Oil-immersed or dry-type transformer, capacity calculated from project load, SCB / S series |
| Low-voltage side | Low-voltage feeder cabinets / distribution boxes, multiple outgoing circuits, with metering and protection |
| Protection and metering | High-voltage fuse protection, low-voltage circuit breaker protection, meters per utility requirements |
| Vector group | Dyn11 / Yyn0 and others per the supply system requirements; neutral grounding method per code |
| Compensation (optional) | Low-voltage side power factor correction to improve power factor |
| Component brands | Schneider / ABB / Siemens / Chint, or as specified by the project |
| Single-transformer package substation | One transformer plus both high- and low-voltage sides; the most common package substation for small capacities |
|---|---|
| Dual-transformer package substation | Two transformers in parallel or one duty / one standby, for critical loads |
| Package substation with power factor correction | Correction cabinet added on the low-voltage side to meet power factor requirements |
| Package substation with dual-source incoming feeders | Two high-voltage feeds or dual high- and low-voltage sources, with transfer switching |
| Landscape-type / semi-buried package substation | Custom enclosure styling for urban landscape or space-constrained sites |
| Package substation for solar PV / wind power | Step-up package substation for renewable energy grid connection (per project scheme) |
| Reference standards | GB/T 17467 (high-voltage / low-voltage prefabricated substations); GB/T 7251.1 (low-voltage assemblies) |
|---|---|
| Clearance & creepage | High-voltage side per applicable standards; low-voltage side pollution degree 3, overvoltage category III |
| Insulation test | Transformer insulation per standard; low-voltage circuit insulation resistance ≥1 MΩ |
| Temperature rise test | Transformer and low-voltage side temperature rise meets standard requirements |
| Sealing and rain test | Enclosure sealing and ingress protection verified against the installation environment |
| Factory tests | High- and low-voltage circuit checks, insulation, transformer turns ratio and DC resistance, interlock and protection operation |
| Documents with shipment | Single-line diagram, secondary schematic, test report, certificate of conformity, factory photos |
Five steps to specify your run
A configuration summary is generated as you go. It travels with your inquiry, saving a round of confirmation.
Build details
Systems have been in service for decades, and the failure points are always the same few: poor busbar contact, water ingress at the door seal, high temperature rise in the correction cabinet, and mis-phased outgoing feeders. The six hard rules below are written for exactly these points — every cabinet can be traced to them.
Integrated prefabricated distribution and transformation
The HV section, transformer and LV section are assembled and functionally tested at the factory, then lifted into place as one unit. Once the cables are connected on site, the unit is ready to energize — no civil works schedule for a distribution room.
HV and LV isolated
The HV compartment, transformer compartment and LV compartment are three separate compartments with independent doors. Servicing the LV side does not require access to the HV side — clear, safe isolation.
Transformer ventilation calculation
The transformer compartment ventilation area is calculated based on capacity, with louvers or fans provided. Insufficient heat dissipation forces the transformer to run derated, which over time is a loss of service life.
Fully sealed enclosure
Enclosure door seams and cable entry points are all sealed against rain, dust and small animals. Half of all outdoor package substation failures come from water ingress and insects.
Lift-as-one structure
The enclosure is designed for lifting as one unit, with a structural steel frame and lifting points. It is lifted into position in a single pick on site — no racking, no deformation.
HV/LV interlock test
Full factory testing before shipment: HV/LV interlocking, protection operation, and complete transformer parameter tests. Test records ship with the unit.
Photos & enclosure construction
Below are photos taken in our own shop — from the complete unit down to the internal busbars and secondary wiring. Every build detail can be checked item by item.
Image key: 01–05 are shop photos (the numbers match the shot list). The line drawing shows the front elevation of the enclosure; dimensions match the specification table above.
Where these cabinets go
These are the routine applications — we can talk scheme and configuration directly. For the industry view, see the industry pages.
Residential Areas & Communities
Integrated power supply and distribution for residential communities and resettlement areas.
Industrial Parks & Job Sites
Temporary or permanent power supply with fast energization.
Municipal & Road Lighting
Power distribution for roads, plazas, and pump stations.
New Energy Projects
Step-up and grid-tie support for solar PV and wind power (per project design).
Mining & Remote Sites
Package substations for standalone power supply where outdoor protection requirements are demanding.
Commercial & Public Buildings
Pre-assembled power supply for sites with concentrated loads and limited land.
Commercial terms
Specification dated September 2026; quotations follow this.
| Drawings & design | Free |
| MOQ | 1 unit (5 or more recommended for production) |
| Production lead time | 15-25 days after drawing approval |
| on-time delivery | 98% |
| Warranty | 12 months |
| Loading port | Ningbo / Shanghai, China |
| Component brands | Schneider / ABB / Siemens / Chint |
| Factory visit & dispatch confirmation | Factory visits welcome; finished-cabinet photos and video before dispatch |
| Capacity | 5,800+ units / year |
Documents for your engineering team
Selection manual, outline dimensions and RFQ checklist — for the customer's electrical engineer. All three documents are being organized by product line; download links go live once complete.
Six questions procurement and electrical engineers ask most
What is the difference between a package substation and a conventional distribution room?
A package substation pre-assembles the HV, transformer, and LV sections in a single enclosure. It is factory-built and lifted into place as a whole, eliminating the construction schedule and footprint of a civil distribution room. A conventional distribution room requires on-site civil work before equipment installation. Package substations suit concentrated loads, fast energization, and tight sites; distribution rooms suit large capacities and on-site expansion.
What capacity can a package substation handle?
Single-transformer units from 315–1600 kVA are standard. Larger capacities can use a dual-transformer configuration or a conventional distribution room. Final capacity is calculated from your load — send us your equipment list or load estimate and we will run the numbers.
Will a package substation leak or let small animals in when installed outdoors?
The enclosure is fully sealed by design. Door seams and cable entry points are sealed, and the ingress protection (IP) rating is selected for the installation environment. Rain, dust, and animal ingress resistance are basic requirements for package substations, and we verify sealing and protection before the unit leaves the factory.
How do you configure the HV side?
The HV side is configured per the power supply scheme with a load break switch + fuse combination or HV circuit breakers, together with metering. The HV section must meet local utility acceptance requirements, so we configure it to the code of the project location.
Can power factor correction be included?
Yes. A correction cabinet on the LV side switches automatically based on power factor, helping you meet the power factor threshold on your electricity bill.
What do I need to provide for an inquiry?
Load capacity or equipment list, supply voltage level, HV incoming configuration, number of LV outgoing circuits, installation location and size constraints, and whether dual power supply or power factor correction is needed. A power supply scheme is ideal; if you do not have one, we will prepare a preliminary design from your load estimate.
Other cabinet types in the same main circuit
Related products use color-block placeholders for now (product photos not yet complete; they will be replaced together). Internal links will be filled in once live URLs are confirmed.
Need fast energization and want to skip civil construction time? A package substation is worth running the numbers on.
Send us your load capacity, supply voltage level, and LV circuits for a free package substation design review · Quotation within 24 hours. Direct from the source factory, MOQ 1 unit, 15–25 day delivery, 1-year warranty.
ISO 9001:2015 · CE(LVD+EMC) · CQC · IP65
When you write, include: single-line diagram or primary scheme, switch room layout, load list, and component brand requirements. You do not need complete drawings — capacity and cabinet type are enough to start.