Product Overview
The 22kV gas-insulated ring main unit is a compact medium-voltage gas-insulated power distribution complete device developed for urban distribution networks, industrial parks, commercial complexes, rail transit, new energy stations and power grid upgrading and reconstruction. It is suitable for three-phase AC 50Hz, rated voltage 22kV power distribution systems, mainly undertaking core functions such as power distribution, control, protection, monitoring and rapid fault handling, and is a key equipment for building a safe, efficient and intelligent distribution network.
With SF₆ gas insulation as the core, the product integrates modules such as load switch, earthing switch, fuse, intelligent measurement and control unit and five-prevention interlocking. It adopts a fully sealed and fully insulated structural design, featuring safety and reliability, small footprint, convenient installation, high intelligence and strong environmental adaptability. It is widely used in urban residential quarters, industrial parks, municipal facilities, rail transit, mines and oil fields, overseas power grids and other scenarios, fully meeting the requirements of distribution network automation and smart grid construction.
The product strictly complies with national standards and international specifications such as GB/T 3906-2020, GB/T 11022-2020 and IEC 62271, and has passed authoritative type tests and CCC certification, with stable performance and reliable quality.
Operating Environment
1. Ambient temperature: -25℃～+40℃, the 24-hour average temperature does not exceed +35℃; it can be customized to adapt to extreme temperature environments of -40℃～+55℃.
2. Altitude: Normally applicable to altitude ≤2000m, and can be customized to 4000m for special working conditions.
3. Relative humidity: Daily average ≤95%, monthly average ≤90%; equipped with anti-condensation temperature control system to eliminate moisture faults.
4. Pollution class: Standard Class Ⅲ, Class Ⅳ anti-pollution, anti-salt spray and anti-corrosion customization schemes are available.
5. Installation conditions: The installation inclination angle is ≤5° with the vertical plane, no fire, explosion, strong vibration, corrosive gas or dust pollution, and it can adapt to conventional indoor and outdoor operating environments.
Technical Parameters
Item | Unit | Parameter |
Rated voltage | kV | 24 (system 22kV) |
Rated frequency | Hz | 50 |
Rated current | A | 630/1250 |
Rated short-time withstand current (1s/3s) | kA | 20/25/31.5 |
Rated peak withstand current | kA | 50/63/80 |
Power frequency withstand voltage (1min) | kV | 65 |
Lightning impulse withstand voltage | kV | 125 |
Insulating gas | — | SF₆, fully sealed gas chamber, annual gas leakage rate ≤0.1% |
Switch structure | — | Three-position load switch/circuit breaker, reliable mechanical interlocking |
Protection class | — | Cabinet IP43/IP54, gas chamber IP67 |
Mechanical life | times | ≥10000 |
Cabinet material | — | Stainless steel/aluminum-zinc coated steel plate, corrosion-resistant and durable |
Product Features
1. Fully sealed and fully insulated, long-term maintenance-free
The core conductive circuit and switch components are sealed in a stainless steel gas chamber filled with SF₆ insulating gas, and the live parts are completely shielded, not affected by dust, moisture, rain and snow. The annual gas leakage rate of the gas chamber is extremely low, enabling long-term maintenance-free operation and significantly reducing operation and maintenance costs and labor input.
2. Complete five-prevention interlocking, safe operation without worry
Equipped with a forced mechanical interlocking device to prevent mis-closing/opening of the switch, prevent operation with load, prevent closing to ground when live, prevent power transmission with the earthing switch closed, and prevent entering the live compartment, comprehensively ensuring the safety of operators and equipment.
3. Modular design, flexible configuration and adaptation
Adopting standard unit modules, it can freely combine functional units such as ring inlet, ring outlet, feeder, PT, metering and circuit breaker, supporting various wiring modes such as single-ring, double-ring, radial and dual-power supply. The circuit expansion is convenient and the interchangeability is strong, meeting the needs of different power distribution scenarios.
4. High-protection structure, adaptable to complex environments
The cabinet is made of anti-corrosion and anti-rust plates, with a double-layer top cover and water guide structure design, featuring excellent waterproof, sun-proof and anti-corrosion performance. The overall protection level reaches IP43–IP54, with high mechanical strength, which can operate stably in harsh indoor and outdoor environments and has a long service life.
5. Intelligent integration, supporting distribution network automation
It can be integrated with an intelligent terminal unit to realize functions such as telemetry, remote signaling, remote control, fault detection and location, and automatic fault isolation. It supports various communication methods such as 4G/5G, Ethernet, power carrier and wireless private network, seamlessly connecting with the distribution automation platform to improve power supply reliability and management efficiency.
6. Efficient installation and deployment, saving space costs
Fully pre-installed and debugged in the factory, only foundation fixing and cable connection 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, indoor power distribution rooms, outdoor box-type substations and overseas simple stations.
Core Advantages
1. Mature and stable technology: Deeply engaged in the R&D and manufacturing of medium-voltage power distribution equipment, core components are selected from high-quality brands, with full-process quality control. The products have passed power grid access certification and have high operational reliability.
2. Leading intelligence level: Supports primary and secondary fusion, remote monitoring, status visualization, line loss monitoring, fault self-healing and other functions, adapting to the development trend of digital distribution networks.
3. Improved customized services: Can customize the number of circuits, operation mode, protection level, communication scheme, cabinet size, etc. according to user needs, accurately matching special working conditions.
4. Full life cycle guarantee: Provide one-stop services such as scheme design, production and manufacturing, installation guidance, commissioning training, operation and maintenance after-sales, ensuring long-term stable operation of the equipment.
5. Fast and efficient delivery: Standardized mass production, sufficient inventory, short delivery cycle, and responsive to urgent orders, large-scale centralized procurement and overseas project needs.
Ordering Instructions
Please provide the following information when ordering:
1. System voltage level, circuit configuration and main wiring diagram;
2. Rated current, short-circuit current, type of operating mechanism;
3. Intelligent function requirements and communication mode;
4. Installation environment parameters, protection level, cabinet size and color requirements.
