Prefabricated Cabin Substation Product Introduction

1. Product Brief Introduction

The prefabricated cabin substation is a modular and integrated complete set of power distribution equipment built with standardized prefabricated cabins. It integrates core power distribution unit components such as high-voltage cabinets, transformers, low-voltage cabinets, intelligent measurement and control devices, and reactive power compensation into a factory-prefabricated airtight cabin. It completes pre-assembly, debugging and testing of all equipment on site, with only basic cabin pouring and fixed-point cable connection required for commissioning. Compared with traditional civil-built substations, it features high standardization, short construction period, flexible capacity expansion, and adapts to standardized construction of power grids, centralized grid connection of new energy sources, rapid power distribution in industrial parks and other scenarios, serving as the core standardized equipment for the new generation of intelligent distribution networks.

2. Scope of Application

• Power grid standardization construction: Complete-set power distribution for urban network station area renovation, rural network upgrading projects, and new standardized power distribution stations of power grids
• Centralized grid connection of new energy: Voltage step-down and grid connection power distribution for centralized photovoltaic/wind power stations, energy storage stations, and optical storage and charging integrated stations
• Municipal key projects: Temporary/permanent supporting rapid power distribution for industrial parks, large industrial construction sites, stadiums and gymnasiums, etc.
• Rapid power distribution scenarios: Emergency power distribution for traffic hubs, exhibition centers and other temporary/permanent supporting facilities
• Remote area power supply: Construction of standardized substation stations in limited construction conditions such as plateaus, mining areas, and remote villages and towns
• Voltage level configuration: 10kV/35kV/110kV high-voltage incoming lines, 0.4kV low-voltage outgoing lines, covering capacity requirements from 500kVA to 20000kVA, supporting multi-cabin combination and capacity expansion

3. Model Definition (Compiled by National Standardization, Characteristics of Prefabricated Cabin Modularization)

The model number of the prefabricated cabin substation is defined by prefabricated substation code + voltage level + transformer capacity + cabin configuration + expansion characteristic code, with high identification and adaptability to national grid/southern power grid standards. For example, YZC-35/0.4-2000-GZ, the definition of each part is as follows:

• YZC: Exclusive code for prefabricated cabin substation (Y - Prefabricated, Z - Cabin type, C - Substation), distinguished from ordinary box-type/substation box transformers
• 35/0.4: Rated voltage, 35kV/12kV (10kV)/110kV for high-voltage side, 0.4kV for low-voltage side; multi-voltage level marked as 35/10/0.4
• 2000: Rated capacity of main transformer, unit kVA, common specifications include 500/1000/2000/5000/10000kVA
• Cabin configuration code: G - High-voltage cabin, B - Transformer cabin, D - Low-voltage cabin, F - Comprehensive function cabin; multi-cabin combination marked as GBD (High + Transformer + Low)
• Expansion characteristic code: Z - Intelligent type, N - New energy grid-connected type, K - Rapid capacity expansion type, Y - Plateau type, F - Explosion-proof type, marked for scenario-specific characteristics

4. Working Conditions

4.1 Environmental Conditions

• Ambient temperature: -40℃~+60℃ (wide temperature design), high cold type can be customized to -50℃, high temperature type can be customized to +70℃
• Relative humidity: ≤95% (at 25℃), allowing temporary condensation; the cabin is equipped with an intelligent anti-condensation system to prevent condensation short circuit
• Altitude: ≤3000m; for sea level >3000m, customized derating design is available to adapt to high-altitude power grid/new energy projects
• Vibration and impact: Withstand highway transportation vibration (acceleration ≤3g) and outdoor slight vibration; the cabin has anti-vibration buffer structure
• Ambient medium: Withstand outdoor dust, rain, snow, sand dust; anti-corrosion reinforcement (anti-salt spray/corrosive gas) is optional for coastal/chemical areas
• Installation environment: Outdoor open space, semi-outdoor power distribution area, no severe vibration, no flammable and explosive medium, away from strong electromagnetic interference sources

4.2 Electrical Working Conditions

• Power frequency: 50Hz±2Hz, withstand slight fluctuations of new energy load frequency
• Voltage fluctuation: High-voltage side ±10%, low-voltage side ±7%, adapting to power grid voltage fluctuations and new energy output volatility
• Load characteristics: Adapt to conventional power grid load, industrial heavy load/impact load, new energy intermittent/volatile load, supporting long-term full load operation
• Grid connection standards: In line with GB/T 17467-2019 "Prefabricated Substations", "National Grid Prefabricated Cabin Substation Technical Specifications" and "Distributed Power Source Grid Connection Technical Requirements"
• Installation method: Outdoor cement foundation ground installation; cabins are connected with standardized connectors, the flatness of the installation site ≤5mm/m, supporting crane rapid hoisting and installation
• Implementation standards: Follow national grid/southern power grid prefabricated standardization design specifications, in line with GB 50053 "Code for Design of 10kV and Below Electric Substations" and GB 50060 "Code for Design of 35kV and Below Electric Substations"

5. Main Technical Parameters

5.1 High Voltage Side (10kV/35kV/110kV)

• Rated Voltage: 12kV (10kV distribution network), 35kV (medium voltage), 110kV (high voltage)
• Rated Current: 630A/1250A/2000A (35kV and below), 3150A (110kV)
• Rated Short-Circuit Breaking Current: 20kA/25kA (10kV), 16kA/20kA (35kV), 31.5kA (110kV)
• Switch Type: 10/35kV equipped with intelligent vacuum circuit breaker, 110kV equipped with SF6 intelligent circuit breaker, all supporting electric operation, status feedback and remote closing/opening
• Protection Function: Overcurrent, quick break, zero sequence, overvoltage/undervoltage, differential protection; support remote setting of protection parameters and fault recording

5.2 Transformer Part

• Type: SCB15/SCB16 energy-saving dry-type transformer (medium and low voltage/indoor), S14/S15 oil-immersed transformer (high power/outdoor), SZ11 on-load voltage regulating transformer (power grid regulation demand)
• Rated Capacity: 500kVA-20000kVA, multi-cabin combination can realize parallel operation of multiple transformers
• Connection Group: Dyn11 (low-voltage power distribution), Yd11 (high-voltage step-up), adapting to power grid/industrial/new energy load characteristics
• Insulation Level: Dry-type F/H level, oil-immersed A level; temperature rise limit complies with GB/T 6451/GB/T 1094 standards
• Intelligent Monitoring: Equipped with winding temperature, oil temperature/oil level (oil-immersed type), iron core temperature sensors; support over-temperature alarm and automatic start/stop of cooling system

5.3 Low Voltage Side (0.4kV)

• Rated Voltage: 400V/230V (line/phase voltage), Rated Current: 1250A/2500A/4000A
• Rated Short-Circuit Withstand Capacity: 50kA/80kA/100kA; outgoing circuits: 12-48 circuits (customizable, each circuit with independent intelligent measurement and control)
• Reactive Power Compensation: SVG intelligent dynamic reactive power compensation device, compensation capacity 50-500kvar, power factor automatically compensated to ≥0.98, supporting remote regulation
• Metering Function: National grid certified intelligent gateway meter + sub-circuit metering, accuracy class 0.2S, supporting forward and reverse metering; data transmitted to power grid dispatching system

5.4 Prefabricated Cabin and Core Intelligent Parameters

• Cabin Parameters (Standardized Prefabrication, Industrial-Grade Protection):
  • Cabin material: Cold-rolled steel plate/aluminum alloy plate, thickness ≥2.5mm, surface anti-corrosion, anti-ultraviolet, anti-static spray treatment
  • Cabin specification: National standard standardized size (width 2.4/3m, length 6/9/12m, height 2.8/3.2m), supporting multi-cabin splicing and stacked arrangement
  • Protection grade: Cabin overall IP54/IP65, internal power distribution unit IP20/IP33, adapting to outdoor/semi-outdoor installation
  • Supporting facilities: Standard configuration of ventilation, dehumidification, heating, fire protection (smoke + dry powder fire extinguishing), lighting system; with cabin access control and video monitoring
• Intelligent Core Parameters (Full-Dimension Measurement and Control, Intelligent Management):
  • Monitoring dimension: Electrical quantity (U/I/P/electric energy/power factor), equipment status (switch on/off, transformer temperature), cabin environment (temperature and humidity, smoke, access control), lightning arrester status, cable temperature
  • Communication function: RS485/Modbus/fiber/4G/5G/power line carrier, supporting seamless docking with power grid dispatching platform, smart park platform and new energy monitoring platform
  • Remote control: Support remote closing/opening, protection parameter setting, reactive power compensation regulation, cooling system start/stop, adapting to unattended requirements
  • Energy analysis: Equipped with edge computing module to realize fault early warning, energy consumption analysis, load prediction, health status evaluation; data storage ≥1 year
  • Networking function: Support multi-cabin and multi-station cluster networking to achieve unified monitoring and centralized management

6. Performance Characteristics

• Standardized prefabrication, efficient construction: The cabin and internal power distribution equipment are prefabricated in accordance with national grid/power grid standards, completing full pre-assembly and debugging; only basic assembly and cable connection are required on site, with single cabin delivered and put into operation within 24 hours, multi-cabin fully installed and debugged in 3-5 days, reducing the construction cycle of traditional civil-built substations by more than 80%
• Modular design, flexible expansion: Adopting high-voltage cabin + transformer cabin + low-voltage cabin modular layout, each independent cabinet is connected by standard interfaces; the number of cabins and transformer capacity can be increased according to load growth
• Industrial-grade protection, excellent durability: The cabin is made of cold-rolled steel/aluminum alloy with multi-layer anti-corrosion, anti-ultraviolet treatment; protection grade IP54/IP65, withstanding -40℃~+60℃ extreme temperature, dust, rain and snow environment; the internal intelligent dehumidification system ensures stable operation of equipment for more than 30 years
• Full-dimensional intelligence, unattended operation: Equipped with edge computing, energy consumption analysis and early warning system, realizing automatic monitoring of electrical quantity, equipment status and cabin environment; supporting remote operation and maintenance, fault location and automatic alarm, meeting the unattended requirements of power grid/new energy/industrial parks
• Complete adaptation to power grid/new energy/industrial parks: Strictly in accordance with national grid/southern power grid standard design, the cabin size, interface and connection are unified and standardized, realizing rapid connection and commissioning of power grid, new energy and industrial park power distribution
• High integration, land saving: All power distribution units are integrated into a sealed cabin, no need for additional civil engineering such as external construction, distribution room and cable trench; the single cabin covers an area is only 1/10 of traditional civil-built substations, with compact multi-cabin arrangement, adapting to the tight land resources in urban/industrial park areas
• Comprehensive safety protection, reliable operation: The high-voltage side is equipped with five-prevention interlock, the low-voltage side is equipped with standard leakage protection, short circuit protection and over-temperature protection; the cabin has anti-electric shock, waterproof and anti-external impact protection, fully meeting the safety operation specifications of power grid/industrial/new energy projects
• Convenient transportation, universal adaptation: The cabin is prefabricated in standardization, can be transported by highway, railway, without on-site assembly; the overall hoisting and rapid installation are realized, adapting to the rapid construction needs of different regions and scenarios
• High operation and maintenance efficiency, low cost: The cabin is equipped with dedicated maintenance and operation channels, the internal equipment layout is standardized, and daily inspection, maintenance and repair work is convenient; the intelligent system realizes fault precise positioning and remote diagnosis, greatly reducing the frequency of manual inspection
• Multi-scenario adaptation, strong versatility: Supporting 10kV/35kV/110kV multi-voltage levels, 500kVA-20000kVA capacity range, customizable for power grid, industrial, new energy, plateau and other scenarios, meeting the power distribution needs of different projects