Prefabricated Substation
The YB series prefabricated substation (commonly known as a "packaged substation" or "box-type substation") is a compact, outdoor complete power distribution equipment that organically combines high-voltage switchgear, distribution transformers, and low-voltage distribution devices according to a specific wiring scheme. It is primarily used in three-phase AC 50Hz power systems with rated voltages from 6-40.5kV (especially 12kV) to receive and distribute electrical energy, transforming high voltage to low voltage of 0.4kV (400V) or 0.69kV to directly provide power and lighting sources for end-users. This product features compact structure, small footprint, easy installation, reliable operation, good protection, and strong environmental adaptability. It is an excellent alternative to traditional civil-built substations and is widely used in urban and rural power grids, industrial and mining enterprises, public facilities, and various temporary power consumption sites.
Detailed Technical Specifications
The table below summarizes the key technical parameters of the YB series prefabricated substation, primarily categorized based on rated voltage levels (12kV and 40.5kV).
Parameter Category | YB-12 (12kV/0.4kV) | YB-40.5 (40.5kV/0.69kV) | General or Other Notes |
Rated Voltage | HV Side: 12kV; LV Side: 0.4kV | HV Side: 40.5kV; LV Side: 0.69kV | HV Side can also be 6kV, 10kV |
Transformer Rated Capacity | 500~2000kVA | Up to 4000kVA | Common range 30~2000kVA, depends on model and configuration |
Rated Frequency | 50Hz | 50Hz | 50Hz |
HV Side Rated Current | -- | -- | Up to 630A |
LV Side Rated Current | -- | -- | Main circuit 40~4000A |
Rated Short-time Withstand Current (LV) | 50kA (1s) | 30kA (1s) | -- |
Rated Peak Withstand Current (LV) | 105kA | 63kA | -- |
Rated Short-circuit Breaking Current (HV) | -- | -- | E.g., 31.5kA (current-limiting fuse) |
Power Frequency Withstand Voltage (1min) | HV Connection: 42kV; LV Connection: 2.5kV; Auxiliary Circuit: 2kV | HV Connection: 95kV; LV Connection: 1.89kV; Auxiliary Circuit: 2kV | HV Phase-to-Earth/Phase 42kV, Isolating Distance 48kV (12kV level) |
Lightning Impulse Withstand Voltage | HV Connection: 75kV; LV Connection: 7.3kV | HV Connection: 185kV; LV Connection: 9.8kV | HV Phase-to-Earth/Phase 75kV, Isolating Distance 85kV (12kV level) |
Protection Degree | -- | -- | Enclosure typically IP33 or higher; Common: HV Compartment IP33, Transformer IP23, LV IP33; Up to IP54 |
Noise Level | -- | -- | Typically ≤50dB |
Note: The above parameters are common values for the series. Specific values may vary depending on the manufacturer, specific model (e.g., YB, YBM, YB6), and configuration. Please refer to the actual order contract and technical agreement.
Key Product Features
1.Integration and Compact Design
Integrates high-voltage power reception, transformer step-down, and low-voltage distribution functional modules tightly within one or several anti-rust, anti-corrosion enclosed enclosures, forming a complete substation system.
Adopts layouts like "Line" type or "Triangular" type, featuring a compact structure and a footprint significantly smaller than traditional civil substations (can be reduced by 80%-90%), effectively saving land resources and potentially simplifying approval procedures.
High degree of factory prefabrication significantly reduces on-site installation and commissioning work, shortening the construction period.
2.Structure and Environmental Adaptability
Diverse Enclosure Materials: Often uses stainless steel plate, composite plate, aluzinc-coated plate, aluminum alloy plate, or metal engraved plate, with special anti-corrosion treatment to withstand harsh outdoor environments and ensure long service life.
Reasonable Internal Layout: Typically divided into three separate compartments: High-voltage compartment, Transformer compartment, and Low-voltage compartment, isolated from each other, ensuring high safety and reliability.
Temperature Control and Ventilation System: The transformer compartment is equipped with natural ventilation and forced ventilation systems (e.g., automatically controlled exhaust fans), and often includes thermostats and heaters for effective heat dissipation and condensation prevention, ensuring transformer operation at full load.
Excellent Protection Performance: Doors, windows, and ventilation openings have dust-proof, anti-vermin, and anti-water seepage/leakage measures. The protection degree usually reaches IP33 or higher (e.g., IP54).
3.Electrical Performance and Safety
High-Voltage Side: Can be configured with ring main units (e.g., HXGN series), using load switches (e.g., vacuum, SF6) or circuit breakers. Supports various modes like ring main supply, dual power supply, or terminal supply, and incorporates comprehensive "Five Prevention" mechanical interlocking functions to prevent misoperation, ensuring safety and reliability.
Transformer: Options include oil-immersed transformers or dry-type transformers (e.g., SCB series), with a wide capacity range.
Low-Voltage Side: Employs low-voltage switchgear assemblies. Can be configured according to user needs for multiple outgoing lines (using molded case circuit breakers, etc.), automatic reactive power compensation devices, energy metering instruments (HV or LV metering), and various protection and control units, offering complete functionality.
Safety Design: The structure prevents easy access to live parts. Designs like pressure relief channels enhance safety.
4.Intelligence and Reliability
Can be equipped with microprocessor-based comprehensive automation devices to achieve telemetry, teleindication, telecommand, teleregulation ("Four Tele") functions, integrating protection, measurement, and control, supporting unmanned operation mode.
Monitors internal temperature and humidity, and automatically controls ventilation, heating, and other equipment to create a favorable operating environment.
Main electrical components are selected for reliable performance and mature technology, ensuring stable overall operation and low maintenance requirements.
Typical Applications
Urban Power Grids: Urban distribution network construction and renovation, residential communities, high-rise buildings, commercial centers, parks.
Industrial and Mining: Power distribution centers for industrial and mining enterprises, oil fields, docks.
Infrastructure and Public Utilities: Airports, stations, highways, railways, tunnels, street lighting systems.
Temporary Power Sites: Large construction sites, stadiums, temporary event venues.
New Energy Field: Potential use at points of connection for distributed energy resources.
Operating Environmental Conditions
Altitude: Typically ≤1000m (Special designs available for higher altitudes).
Ambient Temperature: Typically -25℃ ~ +40℃ or -30℃ ~ +40℃.
Relative Humidity: Daily average ≤95%, Monthly average ≤90% (at +25℃).
Wind Speed: Typically ≤35m/s.
Installation Site: Places without severe vibration, explosion hazards, heavy pollution, or chemical corrosion. Installed on a flat and solid platform (e.g., concrete platform).
Optional Configurations
High-Voltage Switch: Load switch (Vacuum, SF6, Puffer, Expulsion), Circuit breaker.
Transformer Type: Oil-immersed transformer, Dry-type transformer.
Low-Voltage Outgoing Scheme: Number of outgoing circuits, switch brands and models (e.g., Schneider, ABB, Chint), reactive power compensation capacity (kvar) can be customized.
Metering Method: High-voltage metering or Low-voltage metering.
Enclosure Material: Stainless steel, Composite plate, Aluminum alloy plate, Aluzinc-coated plate, Landscape type (cement with tiles) etc.
Intelligence Level: Standard type or Intelligent type (with microprocessor protection, "Four Tele" functions).
Special Purpose: Street light dedicated substation, Railway dedicated substation, Oil field containerized dedicated substation, Mobile substation, etc
Q1. What is the primary function of the YB Series Prefabricated Substation?
A: The YB series is a compact, factory-assembled power distribution solution. It integrates a High-Voltage Switchgear compartment, a Power Transformer compartment, and a Low-Voltage Distribution compartment into a single, weather-proof enclosure. It is designed to step down voltage (e.g., 11kV/33kV to 400V) for urban, industrial, and construction site applications.
Q2. What are the advantages of using a "Prefabricated" substation over a traditional one?
A: The main advantages are minimal footprint, rapid installation, and lower civil engineering costs. Since the unit is pre-wired and tested at our factory in Shanxi, it can be energized immediately upon arrival at the site, significantly reducing project timelines compared to building a permanent brick-and-mortar substation.
Q3. What materials are used for the outdoor enclosure?
A: To ensure a service life of over 30 years, we offer multiple enclosure options:
GRC (Glass fiber Reinforced Cement): Excellent thermal insulation and aesthetic appeal.
Stainless Steel or Aluminum Alloy: Superior corrosion resistance for coastal or humid areas.
Composite Sandwich Panels: Lightweight with high mechanical strength and UV protection.
Q4. How is the "Three-Compartment" layout organized for safety?
A: Our YB substations utilize a (linear) or (triangle) layout. Each compartment (HV, Transformer, and LV) is separated by fire-proof partitions. The High-Voltage section is equipped with mechanical interlocks to prevent accidental entry while energized, and the Transformer section features independent access doors for easy maintenance.
Q5. How does the substation manage heat dissipation in outdoor environments?
We implement a dual-cooling system:
Natural Ventilation: Strategically placed louvered vents with dust-proof filters.
Forced-Air Cooling: Intelligent, thermostat-controlled industrial fans that activate automatically when the transformer temperature reaches a pre-set limit.
Q6. What types of Transformers can be installed in the YB Substation?
The unit is compatible with both Oil-Immersed Transformers (S11, S13 series) and Cast Resin Dry-Type Transformers (SCB series). For environmentally sensitive areas, we recommend dry-type transformers to eliminate the risk of oil leakage.
Q7. What High-Voltage protection is integrated into the unit?
The HV compartment typically utilizes a Ring Main Unit (RMU) equipped with an SF6 load break switch or a vacuum circuit breaker. It provides comprehensive protection against overloads and short circuits via high-voltage fuses or micro-processor-based relays.
Q8. Is the substation resistant to harsh weather conditions?
Yes. Our YB substations are designed with an IP43 or IP54 protection rating. The roof is sloped to prevent water accumulation, and the base is reinforced to withstand flooding. We also apply anti-condensation coatings to the interior walls to protect sensitive electrical components from moisture.
Q9. Can the substation be customized for Smart City or IoT integration?
Absolutely. We can install Smart Gateways and Intelligent Meters in the LV compartment. This allows for remote monitoring of transformer oil temperature, load status, and door security alerts via GPRS/4G/Ethernet communication to your central control room.
Q10. What testing and documentation do you provide for international export?
Every YB Substation undergoes a full Factory Acceptance Test (FAT), including insulation tests, transformation ratio tests, and functional logic checks for the switchgear. We provide a complete English technical file:
Foundation Drawings and GA drawings.
Single Line Diagrams (SLD).
Test Reports and Compliance Certificates (IEC 62271-202).
Installation and Maintenance Manuals.
