50–1600kVA 10 kV/35 kV YBM 29 Outdoor Prefabricated Substation

The DINGXIN YBM 29 High Voltage / Low Voltage Prefabricated Substation — also known as the European Box-Type Transformer Substation — is a factory-assembled, factory-tested power distribution substation that combines the HV switchgear, the power transformer and the LV switchgear into a single compact, transportable enclosure.

Compared with conventional brick-built substations, the YBM 29 delivers a smaller footprint, faster on-site installation, higher reliability and a cleaner modern appearance. It is purpose-built for outdoor deployment in urban public distribution, residential areas, high-rise buildings, industrial parks, mining sites, ports, oilfields, stations, airports, subways and highways.

Three Independent Compartments

The YBM 29 is divided into three physically separated compartments, each engineered for its own function and safety zone:

01 · High-Voltage Room

• Equipped with a Ring Main Unit (RMU) as standard.

• Supports either air load switches or vacuum load switches to match user requirements.

• Includes a five-prevention interlock system to prevent misoperation.

• When using current-limiting fuses, the load switch automatically trips upon single-phase fuse operation, eliminating the risk of phase-loss faults downstream.

02 · Transformer Room

• Compatible with both dry-type and oil-immersed transformers.

• Oil-immersed versions can be supplied with an oil conservator or in fully sealed (no-conservator) form.

• Supports natural ventilation as standard.

• Optional automatic forced air-cooling system adjusts fan operation based on internal temperature.

• Anti-condensation heater available on request for humid environments.

03 · Low-Voltage Room

• Accommodates a complete set of low-voltage switchgear, fully customizable to user needs.

• Switch cabinets built from high-quality sectional steel with excellent corrosion resistance.

• Both HV and LV cables use cable-type connections for fast, clean wiring.

• All-in-One Integration — HV switchgear, transformer and LV switchgear pre-assembled in the factory, shipped as a single unit, drastically cutting on-site installation time and civil works.

• Three Independent Compartments — Physical separation of HV, transformer and LV zones improves safety and simplifies maintenance without interrupting the rest of the substation.

• Robust & Corrosion-Resistant Enclosure — Frame welded from high-quality channel and angle steel; enclosure made of corrosion-resistant aluminium alloy with a clean, modern finish that blends into urban and industrial environments.

• Flexible Layout Options — "MU" and "PIN" structural forms, with or without internal operating corridor, supporting both termination and looped-network configurations to fit any site footprint.

• Built-in Five-Prevention Interlock — Standard HV safety interlock plus automatic phase-loss protection when current-limiting fuses operate, eliminating common misoperation risks.

• Easy Transport & Installation — Integrated lifting devices at the base allow the complete substation to be moved and installed as a single piece, ideal for temporary or remote sites.

Main Reference Dimensions (W × L × H in mm)

*Note: The 315–630 kVA / Looped Network / With-corridor value of 1000 × 2480 × 2560 mm is reproduced from the original DINGXIN catalogue; please confirm final dimensions with our engineering team before order.

High-Voltage Main Loop Scheme — YBM Combined Transformer Substation

Standard Configuration

Service Conditions

• Installation: Outdoor, free from fire, explosion, serious pollution, chemical corrosive gas and violent vibration.

• Altitude: ≤ 1000 m

• Environmental temperature: −30°C to +40°C

• Relative humidity: ≤ 90% (+25°C)

• For any condition beyond the above limits, please contact DINGXIN for a tailored design.

• Urban public distribution — Compact substations that replace or extend traditional brick-built substations in city networks.

• High-rise buildings & residential communities — Factory-built power supply ready for underground or surface installation.

• Industrial parks & mining enterprises — Robust, transportable substation for fast deployment in new industrial zones.

• Ports & oilfields — Corrosion-resistant aluminium-alloy enclosure withstands salty, humid coastal or petrochemical environments.

• Stations, airports & subways — Quiet, clean, low-profile substation suitable for transportation hubs.

• Highways & roadside service areas — Quick-to-install outdoor power for road infrastructure.

• Temporary construction sites & events — Single-lift installation enables short-notice deployment and relocation.

• Renewable energy step-down — Compact substation for distributed solar / wind step-down and grid connection.

Q1. What is a European box-type prefabricated substation? A European box-type prefabricated substation (also called a package substation) integrates the high-voltage switchgear, transformer and low-voltage switchgear into a single factory-built enclosure. DINGXIN's YBM 29 model combines all three into three independent compartments for fast on-site installation, smaller footprint and safer operation.

Q2. What capacity range does the YBM 29 cover? The YBM 29 covers 50–250 kVA, 315–630 kVA and 800–1600 kVA tiers, with both MU and PIN layout options.

Q3. What transformer types can be installed inside? The YBM 29 transformer room accepts both dry-type and oil-immersed transformers. Oil-immersed units can be fitted with an oil conservator or supplied as fully sealed (no conservator) versions.

Q4. What HV switchgear options are available? A ring main unit (RMU) is fitted as standard, supporting either air or vacuum load switches per user requirement. The HV compartment includes a five-prevention interlock system and automatic phase-loss tripping when current-limiting fuses operate.

Q5. What is the difference between MU and PIN layouts? MU and PIN are two structural arrangements of the three compartments (HV, transformer, LV). Both are available in termination or looped-network configurations, with or without an internal operating corridor, to fit different site footprints and maintenance strategies.

Q6. How is the substation cooled? Natural ventilation is standard. An optional automatic forced air-cooling system adjusts fan speed based on internal temperature, and an anti-condensation heater can be added on request.

Q7. What are the typical dimensions? Overall dimensions (W × L × H in mm) range from approximately 2800 × 1800 × 2560 (50–250 kVA, termination, no corridor) up to 4400 × 2580 × 2560 (800–1600 kVA, with corridor). Detailed dimensions are listed in the technical specifications table.

Q8. Where is the YBM 29 typically used? Urban public power distribution, high-rise buildings, residential communities, industrial and mining enterprises, ports, oilfields, parks, stations, airports, subways and highways — wherever a compact, factory-built, ready-to-connect outdoor substation is needed.

Need a YBM 29 prefabricated substation for your project? Contact JiangSu Dingxin Electric Co., [email protected] (DINGXIN) for layout drawings, datasheets, type-test reports, OEM/ODM service and competitive pricing.