YBW European-style box-type substation (usually labeled as YBW-12, corresponding to a 12kV high-voltage level), is an outdoor pre-assembled compact all-in-one power distribution equipment, commonly known as "European Transformer". It differs from the American box-type transformer in terms of structure, which is divided into independent compartments and has a high degree of standardization.
Ⅰ. Model Definition and Execution Standards
Model meaning: Y (pre-assembled), B (substation), W (outdoor type, N for indoor); example YBW-12/0.4-630kVA, corresponding to 12kV high-voltage, 0.4kV low-voltage, and 630kVA capacity; additional F (anti-corrosion), Z (intelligent monitoring), etc.
Standards: Compliant with GB/T 17467 "High Voltage / Low Voltage Pre-assembled Transformer Station", IEC 62271-202 and other international and domestic standards.

II. Structural Composition
The overall structure is a fully enclosed box, which is strictly divided into three independent compartments:
High-voltage compartment: Equipped with ring main unit (SF6 or air-insulated), load switch / vacuum circuit breaker, lightning arrester, grounding switch; supports ring network power supply, terminal power supply, dual power switching; has complete anti-misoperation interlock.
Transformer compartment: Built-in oil-immersed (S11/S13 series) or dry-type power transformers; equipped with temperature control fan, over-temperature alarm / trip, pressure relief valve (oil transformer); natural + forced ventilation for cooling.
Low-voltage compartment: Low-voltage distribution cabinet, incoming/outgoing line switches, metering device, reactive power compensation device, protection and monitoring unit; realizes power distribution, metering, power factor correction.
Box: Materials can be selected as color steel plate, coated aluminum zinc plate, stainless steel; protection level IP33 or above, capable of resisting moisture, dust, rats, corrosion, and theft; double-layer roof for insulation, appearance can be customized to coordinate with the environment.

III. Core Technical Parameters and Application Scenarios
Common parameters: High-voltage rated 10/12kV, low-voltage 0.4kV; Capacity range typically 315~1600kVA (can be expanded to 2500kVA); 50Hz three-phase AC; Outdoor environmental temperature -25℃ to +40℃.
Typical applications: Urban residential areas, commercial complexes, industrial parks, municipal roads, construction sites, rural and urban power grid renovations; particularly suitable for scenarios that require proximity to load centers, have limited space, and require rapid deployment.
IV. Performance Advantages
Extremely small footprint: Compared to traditional civil construction substations, the footprint is approximately 1/5 to 1/10. No need for separate land acquisition and factory construction.
Factory pre-installation, plug-and-play on-site: All equipment is installed, debugged, and tested at the factory. On-site, only the connection of incoming and outgoing cables is required. Power can be delivered within a few days, significantly reducing construction period and infrastructure costs.
Safe and reliable: Independent compartments, no mutual spread of faults; enclosure protection + electrical interlock + grounding protection, safe operation; fully sealed structure, adaptable to harsh outdoor environments.
Flexible configuration: Customizable high-voltage switch schemes, transformer types, low-voltage circuit counts, compensation capacity, intelligent monitoring systems (remote telemetry, remote signaling, remote control).
V. Functionality and Effects
Realize the connection of 10/12kV high-voltage electricity, voltage transformation (down to 0.4kV), and distribution of electrical energy to low-voltage users; at the same time, complete metering, protection, reactive power compensation, fault isolation, and some intelligent types can be connected to the distribution network automation system.