Procurement Guide
Complete engineering guide for specifying prefabricated compact substations (11kV / 22kV / 33kV) for EPC contractors, industrial parks, utility distribution, and renewable energy projects. Compliant with IEC 62271-202.
Prefabricated compact substations (also known as package substations, kiosk substations, or outdoor transformer stations) combine medium-voltage switchgear, a step-down distribution transformer, and low-voltage distribution panels inside a single factory-tested, pre-wired, weatherproof housing.
By integrating all three electrical compartments into a factory skid, compact substations reduce site civil installation time from 3 months down to 2 days, saving up to 45% in total project installed costs for EPC contractors and utility developers.
As a direct compact substation factory in China, XinHuan manufactures both European package substations and American pad-mounted configurations with factory-direct pricing, routine FAT testing, and rapid export delivery worldwide.
Standard dimensions, weights, and thermal ratings according to IEC 62271-202. Available in walk-in, non-walk-in, or underground vault configurations.
| Rated Capacity (kVA) | HV Voltage (kV) | LV Outgoing Outlets | Approx Dimensions L×W×H (mm) | Approx Weight (kg) | Thermal Enclosure Class |
|---|---|---|---|---|---|
| 100 kVA | 11 / 22 / 33 | 2 Way MCCB | 2,200 × 1,600 × 2,100 | 2,400 kg | Class 10 / Class 15 |
| 250 kVA | 11 / 22 / 33 | 2–4 Way MCCB | 2,400 × 1,800 × 2,200 | 3,100 kg | Class 10 / Class 15 |
| 500 kVA | 11 / 22 / 33 | 4–6 Way MCCB | 2,800 × 2,000 × 2,400 | 4,500 kg | Class 10 / Class 15 |
| 800 kVA | 11 / 22 / 33 | 6 Way MCCB | 3,200 × 2,200 × 2,500 | 5,800 kg | Class 10 / Class 15 |
| 1000 kVA | 11 / 22 / 33 | 6–8 Way MCCB | 3,600 × 2,300 × 2,600 | 6,900 kg | Class 10 / Class 15 |
| 1250 kVA | 11 / 22 / 33 | 8 Way MCCB / ACB | 4,000 × 2,400 × 2,700 | 8,200 kg | Class 10 / Class 15 |
| 1600 kVA | 11 / 22 / 33 | 8–10 Way MCCB / ACB | 4,500 × 2,500 × 2,800 | 10,500 kg | Class 15 / Class 20 |
| 2000 kVA | 11 / 22 / 33 | 10–12 Way ACB | 5,000 × 2,600 × 2,900 | 12,800 kg | Class 15 / Class 20 |
| 2500 kVA | 11 / 22 / 33 | 12 Way ACB / APFC | 5,600 × 2,800 × 3,000 | 15,400 kg | Class 20 |
| 3150 kVA | 11 / 22 / 33 | 12–16 Way ACB | 6,200 × 3,000 × 3,200 | 18,900 kg | Class 20 |
| Feature | European Package Substation (IEC 62271-202) | American Pad-Mounted (IEEE C57.12.28) |
|---|---|---|
| Compartment Layout | 3 Separate Steel Doors (MV RMU, Transformer, LV) | Dead-front cabinet attached directly to transformer tank |
| MV Switchgear Type | SF6 Gas-Insulated RMU or Vacuum Switchgear | Internal loadbreak switches & bay-o-net fuses |
| Capacity Range | 100 kVA to 3150 kVA | 45 kVA to 5000 kVA |
| Transformer Type | Oil-immersed or Dry-type (Cast Resin) | Oil-immersed (Mineral or FR3 vegetable oil) |
| Enclosure Protection | IP23 / IP33 (Trans) & IP54 (RMU / LV) | NEMA 3R Tamper-resistant cabinet |
| Primary Regional Market | Middle East, Africa, Europe, Asia, Latin America | North America, Central America, Philippines |
Houses 11kV, 22kV, or 33kV Ring Main Unit (RMU) switchgear with SF6 gas or eco-friendly air insulation. Includes loadbreak switches, vacuum circuit breakers, cable testing bushings, and relay protection.
Houses a high-efficiency oil-immersed (ONAN) or cast-resin dry-type (AN) transformer with natural louvered ventilation, vibration isolation pads, oil retention tray, and thermal sensors.
Houses main MCCB/ACB circuit breakers, copper busbars, current transformers (CTs), dual-tariff energy meters, surge arresters, and optional automatic power factor correction (APFC) capacitor banks.
Safety for operators and the public is paramount. XinHuan package substations are internal-arc tested according to IEC 62271-202 IAC AB 20kA 1s. In the rare event of an internal arc fault, internal pressure relief flaps channel hot arc gases downward into the civil cable trench, preventing door blowout or lateral gas projection.
Installing a prefabricated compact substation requires minimal site preparation compared to traditional brick-and-mortar substations:
Calculate kVA load sizing or evaluate IEC loss cost lifecycle savings for your substation project.
Custom 3-compartment layout, single-line diagrams (SLD), and FOB/CIF price delivery in 24h.
Get Substation Quote →Quality & Compliance
Every transformer, compact substation, and switchgear unit is engineered under audited ISO quality management systems and type-tested according to IEC 60076 and ANSI C57 international standards.
Certified Quality Management System covering design, coil winding, vacuum drying, oil filling, and routine testing of 10kV–35kV distribution transformers.
Environmental Management System certifying low-loss eco-designed core assemblies, zero PCB insulation oil, and environmentally safe production controls.
Occupational Health and Safety Management System ensuring safety containment in high-voltage testing bays and factory assembly protocols.
Complete routine and type test records (temperature rise, impulse voltage withstand, short-circuit withstand) conducted at CNAS-accredited national research institutes.
On-site factory audit certificate by SGS / Made-in-China, verifying manufacturing premises, export capacity, assembly lines, and legal qualification.
Verified annual supply performance and delivery certificate for overseas power grid EPC and industrial infrastructure projects (Mozambique, Nigeria, Kenya, SEA).
