HUARUI 
Outdoor Prefabricated Box Type Substation (European Style)
The prefabricated box-type substation (European style) is a factory-integrated outdoor power distribution system. It consists of three independent compartments: a high-voltage compartment, a transformer compartment, and a low-voltage compartment. It integrates a high-voltage ring network switch, distribution transformer, low-voltage incoming and outgoing line cabinets, reactive power compensation, metering, and protection and control devices. Rated high voltage ranges from 6-40.5kV, and capacity ranges from 50kVA to 2500kVA. It can achieve ring network power supply, dual power supply, and terminal radial power supply, reducing and distributing medium- and high-voltage power to 0.4kV low-voltage loads. Replacing traditional civil engineering substations, the entire unit is assembled, wired, withstand voltage tested, and commissioned at the factory. On-site, only foundation pouring and cable connection are required for operation. It is a mainstream standardized power distribution equipment for urban power distribution networks, new energy, industrial and commercial, and municipal engineering projects.
All high and low voltage components, transformers, and secondary control circuits are assembled and debugged in the factory, and the entire unit is shipped as a whole. There are no complex assembly procedures on-site, shortening the construction period by more than 70% and significantly reducing civil engineering and labor costs.
The high-voltage, transformer, and low-voltage compartments are completely isolated, equipped with mechanical interlocks, live display, pressure relief, and ventilation and temperature control systems; the outer casing has IP54 protection, is waterproof, dustproof, and condensation-proof, eliminating the risk of cross-compartment discharge and accidental contact.
Built-in 10/15/33kV low-loss oil-immersed/dry-type distribution transformer, with optional oriented silicon steel or amorphous iron core; optimized air duct for natural heat dissipation, noise level ≤55dB at 1 meter, and no-load and load losses meet domestic and international Class 1 energy efficiency standards.
The footprint is only 1/10 to 1/5 that of a traditional civil engineering substation, allowing for placement in greenbelts, roadsides, or factory corners. No large distribution room is required, making it suitable for land-constrained urban areas and industrial parks.
The enclosure is constructed of thickened galvanized steel plate/stainless steel/composite insulation board with multi-layer anti-corrosion coating; it includes a built-in insulation layer, forced ventilation fan, and temperature and humidity controller, adapting to a wide temperature range of -35℃ to +40℃, high humidity, coastal salt spray, and dusty environments.
Standard configuration includes high-voltage load switch + fuse combination protection, transformer temperature control, pressure relief, low-voltage overload, short circuit, leakage, and phase loss protection; optional intelligent remote monitoring and control, automatic reactive power compensation, and remote fault upload.
Supports single-power-terminal power supply, dual-power-supply switching, and ring network power supply; reserves interfaces for photovoltaic and energy storage grid connection; adaptable to distributed renewable energy supporting boost/buck voltage scenarios.
|
Compartment |
Item |
Unit |
Parameter |
|
High voltage compartment |
Rated frequency |
Hz |
50/60 Hz |
|
Rated Voltage |
KV |
3.3KV,6.0KV,6.6KV; 10KV 11KV 13.8KV 15KV 20KV 22kv; 30KV 33KV 35KV 36KV |
|
|
Max service voltage |
KV |
7.2 KV; 12KV,24KV; 40.5KV |
|
|
Rated current |
A |
400,630,1000,1250,1600,2000,2150,...etc |
|
|
Transfer current |
A |
1200-3150A |
|
|
1MIN Power frequency withstand voltage,earth-phase |
KV |
42/48,85/95 |
|
|
1MIN Power frequency withstand voltage,phase/fracture |
KV |
75/85,170/185 |
|
|
BIL |
KV |
75/85,170/185 |
|
|
Rated short circuit breaking current |
KA |
20,31.5 |
|
|
Transformer compartment |
Rated voltage |
KV |
3.3KV,6.0KV,6.6KV; 10KV 11KV 13.8KV 15KV 20KV 22kv; 30KV 33KV 35KV 36KV |
|
Rated power capacity |
KVA |
200KVA Upto 2.5MVA |
|
|
Tapping range |
% |
±2X2.5%,±5% |
|
|
Vector group |
|
Yyn0,Dyn11 |
|
|
Short-circuit Impedance |
% |
4.0,4.2,4.5,6,8 |
|
|
Low voltage compartment |
rated voltage |
V |
220,380,400,415,433,440,660,690,800 |
|
main circuit rated current |
A |
50-4000 |
|
|
branch current |
A |
5-800 |
High-voltage compartment unit
SF6 gas-insulated ring main unit, live indicator, grounding switch, high-voltage current-limiting fuse, cable elbow joint, operating interlocking mechanism, pressure relief device, high-voltage incoming and outgoing cable compartment.
Transformer compartment unit
Low-loss distribution transformer (silicon steel/amorphous optional), corrugated/plate-type radiator oil tank, oil level gauge, pressure relief valve, temperature control and display device, forced ventilation fan, heat insulation and noise reduction partition, grounding copper busbar.
Low-voltage compartment unit
Low-voltage incoming main switch, multi-outgoing molded case circuit breaker, intelligent metering meter, reactive power compensation capacitor bank, leakage protection, secondary PLC monitoring and control, temperature and humidity controller, remote communication module, operation panel.
Enclosure structure
Main frame steel welded together; outer shell options include galvanized steel sheet, 304 stainless steel, and composite insulated sandwich panel; double-layer rainproof roof, ventilated louvered rainproof eaves, independent maintenance doors for each compartment, complete set of door locks, and grounding terminals.
Supporting accessories
1. Core Product Advantages
① Lower Overall Investment Cost: Eliminates the need for large-scale construction of civil engineering power distribution rooms, walls, roofs, and cable trenches; the total investment in equipment and civil engineering is reduced by more than 40% compared to traditional substations, and the construction period is significantly shortened.
② Extremely High Space Utilization: The integrated compact layout and neat, small shape allow it to be embedded in green belts, park roads, and factory corners without occupying core production or living space. ③ Stable operation and low failure rate: The fully sealed compartment structure isolates it from rainwater, dust, and corrosive gases; standardized components undergo full-scale withstand voltage, partial discharge, and temperature rise testing before leaving the factory, resulting in few long-term failures.
④ Modular maintenance and convenient disassembly/reassembly: Independent doors for high and low voltage transformers; modular plug-in/disassembly of components; individual replacement of faulty parts without overall shutdown and disassembly, significantly reducing maintenance time.
⑤ Environmentally friendly and noise-reducing, suitable for urban landscapes: The enclosure can be customized with RAL outdoor colors to blend with greenery and building exteriors; internal noise-reducing partitions and low-noise transformers ensure that nighttime noise in residential areas meets municipal control standards.
⑥ Strong expansion and compatibility: Dual power supply automatic switching, photovoltaic grid-connected cabinets, SVG dynamic compensation, and 4G remote monitoring systems can be added as needed, adapting to new energy and smart grid upgrades.
2. Design Service Life
The standard carbon steel anti-corrosion enclosure has a design service life of 20 years under normal operating conditions; the 304 stainless steel heavy-duty anti-corrosion enclosure can withstand 25-30 years in coastal salt spray environments; the internal transformer and switch components have a service life of over 20 years under standardized operation and maintenance. Regular cleaning of ventilation channels, calibration of protection devices, and replacement of seals can further extend the service life.
1. Urban and Rural Municipal Power Distribution Networks: Replacement of traditional civil engineering substations in urban residential areas, villa areas, parks and squares, street lighting, and power grid renovation in old urban areas.
2. Industrial and Commercial Plants: Centralized power distribution in industrial parks, large factories, shopping malls, office buildings, hotels, hospitals, and schools.
3. New Energy Power Generation Projects: Step-up/step-down transformers for ground-mounted photovoltaic power stations, distributed rooftop photovoltaics, wind farms, and energy storage power stations.
4. Transportation Infrastructure Scenarios: Temporary/permanent power distribution in highway service areas, tunnels, subway systems, airports, ports, and logistics parks.
5. Temporary Construction Power Supply: Temporary power supply for construction sites, mining operations, oil field projects, and large-scale events; the entire unit can be hoisted, moved, and reused.
This series of prefabricated transformers supports in-depth personalized customization for all scenarios, meeting all standard requirements for domestic power grids and overseas exports:
| Customization Dimension | Optional Range / Description |
| HV Voltage Levels | 6 kV, 10 kV (12 kV), 20 kV, 35 kV (40.5 kV); Export: 7.2 / 11 / 13.2 / 13.8 / 15 / 17.5 / 24.94 / 33 kV (Full range) |
| LV Output Voltage | 0.4 kV, 0.69 kV, 0.8 kV, 1.14 kV; Americas: 120/240V, 277V, 347V, 600V |
| Rated Capacity | 50 kVA ~ 2,500 kVA (All standard capacities available) |
| Transformer Scheme | Oil-immersed corrugated tank transformer / Cast resin dry-type transformer; Silicon steel core / Amorphous energy-saving core; All-copper winding / Aluminum foil winding |
| HV Switchgear Configuration | SF6 ring main unit, vacuum load switch, circuit breaker, motorized operation, dual-power automatic transfer switch (ATS) unit |
| LV Distribution Configuration | Multi-circuit outgoing lines, intelligent metering, reactive power compensation / SVG, earth leakage protection, 4G remote SCADA (telemetry, telesignaling, telecontrol, telemetering) |
| Tank Material & Appearance | Galvanized carbon steel, 304 stainless steel, composite insulated sandwich panel; Custom RAL outdoor color code, bilingual (Chinese/English) LOGO nameplate |
| Protection & Corrosion Grade | Standard IP33, Upgraded IP54; C3 inland corrosion protection, C4/C5 coastal heavy-duty anti-corrosion coating |
| Applicable Standards | GB (Chinese national standard), IEC (international standard), ANSI/CSA/DOE (export certification for Americas), 50/60 Hz frequency switchable |
| Additional Optional Features | Intelligent oil temperature / oil level monitoring, audible & visual fault alarm, PV-specific grid-connection cabinet, outdoor rainproof sunshade canopy, integrated lifting base, built-in fire suppression system |
