Product Overview
The 11kV gas-insulated ring main unit is a compact complete power distribution device specially designed for medium-voltage distribution network upgrading, dedicated power supply for industrial enterprises and foreign-related power distribution scenarios. It is suitable for three-phase AC 50Hz, rated voltage 11kV power distribution systems, mainly undertaking the reception, distribution, control, protection and rapid fault handling of electrical energy. It is the core equipment for adapting to 11kV voltage level distribution networks and ensuring power supply continuity, as well as one of the key equipment for modern intelligent distribution network construction.
With SF6 gas fully insulated and sealed technology as the core, the product integrates core modules such as three-position load switch, earthing switch, intelligent measurement and control terminal, five-prevention interlocking, and temperature control and dehumidification. It adopts a modular integrated design, with advantages of safety and reliability, compact size, maintenance-free, high intelligence and strong environmental adaptability. Its compact structure can reduce the floor area by 40%-70% compared with traditional air-insulated switchgear, greatly saving land resources. It is widely used in large industrial parks, foreign-related enterprises, remote area distribution networks, dedicated power supply for commercial complexes, new energy power stations and other scenarios, and can meet the needs of distribution network automation and intelligent management in different scenarios. The product strictly complies with national and international standards such as GB/T 3906, GB/T 11022 and IEC 62271, has passed authoritative type tests and CCC certification, with core performance up to standard and stable and reliable quality, conforming to the mainstream development trend of global gas-insulated switchgear towards miniaturization, maintenance-free and high reliability.
Operating Environment
1. Ambient temperature: -25℃～+40℃, 24-hour average temperature ≤+35℃, can be customized to adapt to extreme high and low temperature working conditions of -40℃～+55℃, meeting the use needs of alpine and high-temperature areas and adapting to outdoor operation under different climate conditions.
2. Altitude: Normally applicable to altitude ≤2000m, special scenarios (such as plateau areas) can be customized and upgraded to 4000m, adapting to high-altitude and low-air-pressure environments to ensure stable insulation performance of the equipment.
3. Relative humidity: Daily average ≤95%, monthly average ≤90%, built-in intelligent temperature and humidity controller and anti-condensation heating system, effectively eliminating condensation in the cabinet, avoiding equipment insulation damage, and ensuring normal operation of the equipment in high-humidity environments.
4. Pollution class: Standard Class Ⅲ, can be customized with Class Ⅳ anti-pollution, anti-salt spray and anti-corrosion coatings according to scenarios, adapting to harsh environments such as coastal areas, chemical industry and mines, and improving the anti-pollution capacity of the equipment.
5. Installation conditions: The installation inclination angle is ≤5° with the vertical plane, the installation site has no fire or explosion hazards, no strong vibration, impact, corrosive gas or conductive dust, and it can adapt to outdoor sun exposure, rain, wind and sand as well as indoor conventional power distribution environments, suitable for various installation scenarios.
Technical Parameters
Item | Unit | Parameter |
Rated voltage | kV | 11 |
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 | 45 |
Lightning impulse withstand voltage | kV | 80 |
Insulating gas | — | SF6, fully sealed gas chamber, annual gas leakage rate ≤0.1% |
Switch structure | — | Three-position load switch, forced mechanical interlocking |
Protection class | — | Cabinet IP43/IP54, gas chamber IP67 |
Mechanical life | times | ≥10000 |
Cabinet material | — | Stainless steel/aluminum-zinc coated steel plate, anti-corrosion and anti-rust |
Product Features
1. Fully sealed and fully insulated, maintenance-free and more worry-free
The core switch and conductive circuit are sealed in a stainless steel gas chamber filled with high-purity SF6 insulating gas, and the live parts are fully shielded, completely isolating external interference such as dust, moisture, rain and snow. The annual gas leakage rate of the gas chamber is ≤0.1%, which is one of the core indicators to measure the manufacturing process. It can realize long-term maintenance-free operation, greatly reducing operation and maintenance costs and labor input, and has obvious life cycle cost advantages.
2. Complete five-prevention interlocking, safer and more secure
Equipped with a complete forced mechanical interlocking device, strictly realizing the "five-prevention" functions — preventing mis-closing/opening of the load switch, preventing pushing and pulling the switch with load, preventing closing the earthing switch when live, preventing power transmission with the earthing switch closed, and preventing entering the live compartment. It comprehensively avoids operational risks, has extremely low arc fault risk, and ensures the safety of personnel and equipment.
3. Modular integration, flexible and adjustable configuration
Adopting standardized functional unit design, it can freely combine units such as ring inlet, ring outlet, feeder, PT and metering, supporting various wiring modes such as single-ring, double-ring and radial. The number of branch circuits can reach up to 8, with convenient capacity expansion and strong interchangeability, accurately adapting to the needs of different power distribution scenarios and having stronger adaptability.
4. High protection and durability, adapting to complex environments
The cabinet is made of high-quality stainless steel or aluminum-zinc coated steel plate, with a double-layer inclined top cover design, having excellent waterproof, sun-proof, anti-corrosion and anti-rust performance. The overall protection level reaches IP43–IP54, and the mechanical strength is IK10. It can operate stably in harsh outdoor environments and indoor power distribution scenarios, with a long service life and adapting to various complex working conditions.
5. Intelligent integration, adapting to distribution network automation
Integrated with DTU/FTU intelligent terminal, it can realize telemetry, remote signaling, remote control, fault detection, fault location, automatic isolation and power restoration of non-fault areas. It supports various communication methods such as 4G/5G, Ethernet and power carrier, and can be optionally equipped with RS485 communication interface, seamlessly connecting with the distribution automation platform to improve power supply reliability and management efficiency.
6. Convenient and efficient installation, saving space costs
Fully pre-installed and debugged in the factory, delivered as a whole. Only foundation fixing and cable access are needed on site, with a short construction period; the equipment has a compact structure and small footprint, suitable for rapid commissioning in scenarios such as narrow urban spaces, industrial parks and outdoor remote areas, greatly improving construction efficiency.
Core Advantages
1. Mature and reliable technology: With years of experience in R&D and manufacturing of medium-voltage power distribution equipment, core components are selected from well-known brands, with strict full-process quality control. The products have passed power grid access testing and authoritative type tests, with high operational stability and low failure rate, conforming to the industry characteristics of high technology intensity, high standards and high access requirements.
2. High intelligence level: Supports primary and secondary fusion design, can realize functions such as remote monitoring, status visualization, line loss monitoring and fault early warning, fully adapting to the development needs of modern digital and intelligent distribution networks and conforming to the industry development trend.
3. Strong customization ability: According to the actual needs of users, it can customize the number of circuits, operating mechanism (manual/electric), protection level, anti-corrosion standard, communication mode, etc. At the same time, it can adapt to environmental protection insulating gas schemes such as dry air and N2, accurately matching various special power distribution scenarios of 11kV voltage level.
4. Full life cycle service: Provide one-stop services from scheme design, production and manufacturing, factory test, on-site installation guidance, commissioning training to lifelong operation and maintenance, fully ensuring long-term stable operation of the equipment and solving users' worries.
5. Fast and efficient delivery: Adopting standardized mass production mode, with sufficient inventory and short delivery cycle, it can quickly respond to urgent orders and large-scale centralized procurement needs, ensuring the project is put into operation on time and improving the efficiency of users' project promotion.
Ordering Instructions
Please provide the following detailed information when ordering to facilitate our company to provide accurate solutions and quotations:
1. System voltage level, circuit configuration (ring inlet, ring outlet, feeder, PT, metering, etc.) and main wiring diagram;
2. Rated current, short-circuit current, type of operating mechanism (manual/electric), control power supply specification;
3. Intelligent requirements: whether to configure DTU/FTU, communication mode, fault detection function, etc.;
4. Installation environment parameters: altitude, temperature and humidity, pollution class, anti-corrosion/anti-salt spray and other special requirements;
5. Inlet and outlet mode, cabinet size, color, installation foundation and cable interface requirements.
