Eco-Friendly Insulation
Uses dry air as the insulating medium and combines vacuum arc-extinguishing technology to replace SF6.
GreenPower
GPR1.2-12kV Eco-Friendly Gas-Insulated Ring Main Unit
Rated Voltage12 kV
Rated Current630 A
Gas MediumDry air
Protection DegreeEnclosure IP3X, gas-insulated compartment IP67
Product Overview
GPR1.2 is a new-generation compact, intelligent, eco-friendly ring main unit developed for distribution network construction and renovation. It uses dry air as the insulating medium and combines vacuum arc-extinguishing technology to replace SF6. It retains the technical benefits of fully insulated RMUs while achieving zero sulfur hexafluoride emissions. It features compact structure, safety, reliability, ease of use, energy efficiency, environmental friendliness, and maintenance-free operation.
Compact And Maintenance-Free
Offers compact size, practical operation, and maintenance-free service as an eco-friendly alternative to SF6-insulated RMUs.
Key Features
Environmentally Friendly
Utilizes specially treated dry air as the insulating medium, supporting green distribution solutions.
Electric Field Optimization
Internal electric-field optimization technology ensures uniform electric field distribution and stable dry-air insulation performance.
Maintenance-Free Operation
Components inside the gas-insulated compartment require no maintenance for 30 years.
Mechanical Interlocking Safety
Mechanical interlocking devices with anti-misoperation functions are provided.
Visual Isolating And Earthing System
Clear analog indication and visual observation support safer isolating and earthing status confirmation.
Internal Arc Pressure Relief
Pressure relief directs internal fault gases toward the rear or bottom of the unit to protect operators.
Compact Design
Occupies less than one-quarter of the floor space of traditional products, saving valuable space.
Sealed Stainless Steel Gas Tank
Primary components and busbars are housed in a sealed stainless steel enclosure for reliability and environmental adaptability.
IP67 Gas Compartment
The enclosure is IP3X while the stainless steel gas-insulated compartment achieves IP67 protection.
Technical Specifications
| Rated Voltage | 12 kV |
|---|---|
| Rated Frequency | 50/60 Hz |
| Main Busbar Rated Current | 630 A |
| Rated Current | 630 A |
| Rated Short-Circuit Breaking Current | 20/25 kA |
| Rated Short-Circuit Closing Current (Peak) | 25/30 kA |
| Rated Short-Time Withstand Current (RMS) | 20/25 kA |
| Rated Short-Circuit Duration | 4 s |
| Rated Peak Withstand Current | 50/63 kA |
| 1 Min Power Frequency Withstand Voltage | 42 kV (phase to phase, phase to earth); 48 kV (across the isolating distance) |
| Lightning Impulse Withstand Voltage | 75 kV (phase to phase, phase to earth); 85 kV (across the switch distance and isolating distance) |
| Auxiliary And Control Circuit (1 min power frequency withstand voltage) | 2 kV |
| Rated Gas Pressure (20℃ gauge pressure) | 0.02 MPa |
| Gas Medium | Dry air |
| Annual Leakage Rate | ≤ 0.05% |
| Gas Tank Maintenance Cycle | 30 years (maintenance free) |
| Rated Operating Sequence | O-0.3s-CO-180s-CO |
| Mechanical Life | Circuit breaker ≥ 10,000; Isolating switch ≥ 5,000; Earthing switch ≥ 3,000 |
Ambient Conditions
Altitude
Not exceeding 3000 m.
Ambient Temperature
-25℃ to +40℃, with daily average temperature not exceeding +35℃.
Relative Humidity
Daily average relative humidity not exceeding 95%, monthly average relative humidity not exceeding 90%.
Seismic Intensity
Not exceeding 8 degrees.
Installation Environment
Suitable for locations free from fire, explosion hazards, severe contamination, chemical corrosion, and intense vibration, and capable of withstanding dust, moisture, and short-term immersion.
Structure Diagram
The GPR1.2 ring main unit primarily consists of the cabinet body and a sealed stainless steel gas tank. The cabinet body is divided into the operating mechanism compartment, cable compartment, and secondary instrumentation compartment. Functional units are separated by metal plates into independent compartments to minimize fault influence.
Busbars, circuit breakers, and connecting conductors are installed within the sealed stainless steel gas-filled enclosure using dry air as the insulating medium. The enclosure is IP3X, with IP4X optional, while the gas-insulated compartment achieves IP67 protection. Modular construction improves interchangeability and helps shorten processing cycles.
GPR1.2 Incoming And Outgoing Cable Unit
Expandable And Outdoor Options
Expandable Ring Main Unit Series
Enables simple and safe expansion through cabinet-to-cabinet operation without gas handling, special tools, or special foundation preparation.
Outdoor Application Series
Outdoor enclosures and accessories are available, with support for motorized operating mechanisms, remote control systems, and communication systems.
Standards And Compliance
| Applicable Standards | GB/T 3906-2020; GB/T 1984-2014; GB/T 3804-2017; GB/T 1985-2014; IEC 60694:2002; IEC 60298:1990; IEC 62271-100:2012; IEC 62271-102:2012 |
|---|
Typical Applications
Compact Substations And Switching Stations
Suitable for compact substations and switching stations in 3.6 kV to 12 kV distribution systems.
Urban Infrastructure
Applicable in urban residential areas, airports, tunnels, and high-rise buildings.
Power And Process Industries
Used in power plants, power grids, petrochemical plants, and metallurgical facilities.
Harsh Environments
Particularly suitable for industrial and mining areas, mountainous regions, plateaus, and coastal areas.
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