Product Overview
Outdoor intelligent box-type switching station (ring main unit) is a compact and intelligent medium-voltage power distribution complete device specially designed for outdoor distribution networks. It is suitable for three-phase AC 50Hz, rated voltage 12kV outdoor ring network power supply systems, and widely used in outdoor power distribution places such as urban residential quarters, industrial parks, commercial complexes, municipal roads, rail transit, ports and docks, oil fields and mines, and power grid reconstruction. It mainly realizes power reception, distribution, control, protection, monitoring and rapid fault handling, supporting the construction of distribution network automation and smart grid.
The product integrates SF6 fully insulated and fully sealed ring network switch unit, primary and secondary fusion intelligent terminal, temperature control and dehumidification, lightning protection, five-prevention interlocking and other functions. It adopts a modular, expandable and high-protection structure, with the advantages of safety, reliability, maintenance-free, fast deployment and high intelligence. It complies with national, industrial and power grid standards such as GB/T 3906, GB/T 11022, IEC 62271, Q/GDW 11250.2, and has passed CCC certification and type tests. It is the core power distribution equipment for outdoor medium-voltage distribution networks.
Operating Environment
1. Ambient temperature: -25℃～+40℃, 24h average temperature ≤+35℃, customized for extreme working conditions of -40℃～+55℃ is available
2. Outdoor installation, altitude ≤2000m, customized to 4000m for special scenarios
3. Relative humidity: daily average ≤95%, monthly average ≤90%, equipped with anti-condensation heating and ventilation cooling system
4. Pollution class: Class Ⅲ, Class Ⅳ anti-pollution, anti-salt spray and anti-corrosion customization is available
5. Installation inclination: ≤5° from the vertical plane
6. Installation site: no fire or explosion hazard, no strong vibration and impact, no corrosive gas, dust and conductive dust, adaptable to harsh outdoor environments such as sun exposure, rain, wind and sand
Technical Parameters
Item | Unit | Parameter |
Rated voltage | kV | 12 |
Rated frequency | Hz | 50 |
Rated current | A | 630 |
Rated short-time withstand current (1s) | kA | 20/25 |
Rated peak withstand current | kA | 50/63 |
Power frequency withstand voltage (1min) | kV | 42 |
Lightning impulse withstand voltage | kV | 75 |
Load switch/SF6 gas chamber | — | Three-position, fully sealed, annual gas leakage rate ≤0.1% |
Protection class | — | Cabinet IP43/IP54, gas chamber IP67 |
Mechanical life | times | ≥10000 |
Overall dimensions (W×D×H) | mm | 1200/1400×1000/1200×1600/1800 |
Executive standard | — | GB/T 3906, GB/T 11022, IEC 62271 |
Product Features
1. Fully insulated and sealed, maintenance-free outdoors
The core switch and busbar are sealed in a stainless steel gas tank filled with SF6 insulating gas, and the live parts are fully shielded from dust, moisture, rain and snow. The annual gas leakage rate of the gas tank is ≤0.1%, realizing long-term maintenance-free and greatly reducing operation and maintenance costs.
2. Complete five-prevention interlocking for safer operation
Equipped with perfect forced mechanical interlocking to prevent mis-closing/opening of load switch, prevent switching with load, prevent closing to ground when live, prevent power transmission with grounding switch closed, and prevent entering live compartment. The operation is safe and controllable to ensure personal and equipment safety.
3. Modular and expandable, flexible configuration
Adopting standard unit modules, which can freely combine ring inlet, ring outlet, feeder, PT, metering and other units, with up to 8 branch circuits, adapting to single-ring, double-ring, radial and other wiring modes, convenient for capacity expansion and strong interchangeability.
4. High-protection structure, adaptable to harsh outdoor environments
The cabinet is made of stainless steel/aluminum-zinc coated steel plate, with double-layer top cover, inclined water guide and sealed waterproof, with excellent anti-corrosion, rust-proof, sun-proof and rainstorm-proof performance. The overall protection can reach IP43–IP54, mechanical strength IK10, and long service life.
5. Intelligent primary and secondary fusion, distribution network automation
Integrated with DTU/FTU intelligent terminal to realize telemetry, remote signaling, remote control, fault detection, fault location, automatic isolation and power restoration of non-fault areas. It supports 4G/5G, Ethernet and power carrier communication, connecting with distribution automation platform to improve power supply reliability and management efficiency.
6. Integrated temperature control and dehumidification, stable and reliable
Built-in heater, temperature and humidity controller, intelligent ventilation system, automatically adjust the temperature and humidity in the cabinet, eliminate condensation, and ensure stable operation of equipment in alpine and high humidity areas.
7. Fast installation and deployment, small footprint
Pre-assembled in the factory and delivered as a whole. Only foundation fixing and cable access are needed on site, with short construction period and small floor area, suitable for rapid commissioning in outdoor scenes such as narrow urban spaces, roadside and residential areas.
Our Advantages
1. Mature and reliable technology: Deeply engaged in R&D and manufacturing of outdoor power distribution equipment, core components are selected brands, full-process quality control, products have passed authoritative tests and power grid access tests.
2. High intelligence: Supports primary and secondary fusion, on-site automation, remote monitoring, line loss monitoring, status visualization, meeting the digital and intelligent needs of modern distribution networks.
3. Strong customization ability: Can customize the number of circuits, protection class, corrosion class, communication mode, operating mechanism, etc. according to user needs, adapting to different scenarios.
4. Full life cycle service: Provide one-stop services such as scheme design, production and manufacturing, factory test, on-site installation guidance, commissioning training, lifelong operation and maintenance to ensure long-term stable operation of equipment.
5. Efficient delivery: Standardized production, sufficient stock, short delivery cycle, responsive to urgent orders and batch centralized procurement needs.
Ordering Guide
Please provide the following information when ordering:
1. System voltage level, circuit configuration (ring inlet, ring outlet, feeder, PT, metering, etc.) and main wiring diagram.
2. Rated current, short-circuit current, operating mechanism (manual/electric), control power supply specification.
3. Intelligent requirements: whether to configure DTU/FTU, communication mode, fault detection function.
4. Outdoor environment requirements: altitude, temperature and humidity, pollution class, anti-corrosion/anti-salt spray/explosion-proof and other special needs.
5. Inlet and outlet mode, cabinet size, color, installation foundation and cable interface requirements.
