EN
- Overview
- Recommended Products
- Load switch units
- Combined load switch and fuse units
- Vacuum circuit breaker units
- Busbar incoming line units
- Clear and intuitive layout ensures simple operation.
- Large feeder connection capacity supports various wiring systems.
- Integrated three-position load switch circuit breaker available.
- Using a load switch instead of a disconnector improves safety.
- The fully enclosed design protects against accidental contact with live parts.
- Mechanical interlocks and live-line indicators meet "five-prevention" safety requirements.
- All switches and live busbars are sealed in a robust, welded stainless steel enclosure (3mm thick).
- Silicone rubber cable plugs ensure full insulation and sealing at cable ends, protecting against dust, humidity, and small animals.
- A pressure gauge constantly monitors the safe SF6 gas pressure within the enclosure.
- Designed for maintenance-free operation with high reliability.
- Expected service life of up to 20 years.
- The cabinet body uses galvanized steel with electrostatic spray for enhanced corrosion resistance.
- The spring energy storage mechanism allows for manual or electrical operation.
- Multiple incoming line methods (left, right, upper, front).
- Units can be combined arbitrarily using insulated busbars (front-to-back or left-to-right).
- Flexible design scheme suitable for various needs.
- Compact footprint saves valuable space.
- Compact secondary substations
- Small industrial and mining enterprises
- Wind power plants
- Hotels and shopping malls
- Office buildings and commercial centers
- GB 1984-2003 (HV AC Circuit Breaker)
- GB 1985-2005 (HV AC Isolation & Ground Switch)
- GB 3804-2004 (3.6kV ~ 40.5kV HV AC Load Switch)
- IEC 60265 (High-voltage Switches)
- GB 16926-2009 (AC HV Load Switch Fuse Combination)
- IEC 420 (HV AC Switch-Fuse Combinations)
- GB 3906-2006 (3.6kV ~ 40.5kV AC Metal Enclosed Switchgear)
- IEC 62271 (High-voltage Switchgear and Controlgear)
- GB/T 11022-2011 (Common Technical Requirements for HV Switchgear)
- IEC 60694 (Common Specifications for HV Switchgear)
- GB/T 11023 (HV Switchgear - SF6 Gas Seal Test Method)
- GB 4208-2008 (Enclosure Protection Class - IP Code)
- IEC 60529 (Degrees of Protection by Enclosures - IP Code)
- DL/T 404 (3.6kV ~ 40.5kV AC Metal Enclosed Switchgear)
- DL/T 728-2000 (Ordering Guide for Gas Insulated Metal Enclosed Switchgear)
Our company produces advanced Gas Insulated Switchgear (GIS), specifically the fully enclosed Ring Main Unit (RMU), designed for voltage classes up to 40.5kV.
What is this Gas Insulated Switchgear?
This unit is a metal common box type enclosed switchgear, utilizing SF6 gas for insulation. This core technology allows for a highly compact and reliable design.
Key components can be integrated into modules, including:
This modularity, combined with excellent materials, results in superior electrical and mechanical performance, making the switchgear less susceptible to environmental factors.
Key Features and Benefits of Our GIS Ring Main Unit
User-Friendly Design:
Enhanced Safety and Reliability:
Durable and Low Maintenance:
Flexible Configuration:
Applications of this Gas Insulated Switchgear
This versatile gas insulated switchgear is ideal for power distribution networks in diverse settings, including:
As a modern gas-insulated solution, its suitability highlights the broader applications of gas insulated switchgear (GIS) across various sectors.
Applicable Standards
This GIS complies with relevant national and international standards:
Type Description (Models: EWR-12, EWR-24, EWR-40.5)
Performance parameter
| Cell code | significance |
| C | Standard single casing load switch unit |
| F | Load switch-fuse combined electrical unit |
| V | Circuit breaker unit |
| D | Cable entry unit (without switch) |
| + | Busbar side bushing |
| - | Busbar top sleeve |
| SL | Parent unit |
| M | Measuring unit |
| PT | PT cell |
| 1K2(4) | Load switch unit with double casing outlet |
| Performance indication | |
| SF6 gas pressure The absolute pressure at 20'C is 1.4bar | Normal operating environment conditions |
| Annual leakage rate of gas. 0.2%/year | Maximum temperature. 40°C |
| Class of protection. IP67 | Minimum temperature. -40°C |
| Air chamber stainless steel thickness. 3.0mm | Maximum mean relative humidity. <95% |
| altitude. ≤2000 meter |
| Bus bar | Meet the criteria |
| Switchgearinside the bus. 400mm^2Cu | GB/T11022. GB3906. GB1985 |
| Switchgear ground bus. 150mm^2Cu | GB16926. GB38041. GB1984 |
| coloun | GB3309 |
| Switch cabinet front panel. RAL7012 | IEC60056 IEC60129. IEC60265 |
| Side panel and cable room front cover plate RAL7035 | IEC60298. IEC60420. IEC60694 |
| item | C module | F module | V module | CB module | ||
| Load switch | Combination apparatus |
Vacuum switch |
Isolation/ground switch |
Vacuum circuit breaker |
solation/ground switch |
|
| Rated voltage kV | 12 | 12 | 12 | 12 | 12 | 12 |
| Rated frequency Hz | 50 | 50 | 50 | 50 | 50 | 50 |
| Power frequency withstand voltage (phase/port)kV |
42/48 | 42/48 | 42/48 | 42/48 | 42/48 | 42/48 |
| Lightning impulse withstand voltage kv |
75/85 | 75/85 | 75/85 | 75/85 | 75/85 | 75/85 |
| Rated current A | 630 | note | 630 | 630 | ||
| Rated closed-loop breaking current A | 630 | |||||
| Rated cable charging breaking current A |
135/135 | |||||
|
Rated short circuit closing current (peak) |
50 | 80 | ||||
| Rated peak withstand current kA | 50 | |||||
|
Rated short-time withstand current kA/3s |
20 | |||||
|
Rated short circuit breaking current KA |
31.5 | 20 | 25 | 25 | ||
| Rated transfer current A | 1750 | |||||
| Fuse maximum current A | - | 125 | ||||
| Loop resistance Ω | ≤300 | ≤600 | ||||
| Mechanical life (second) | 5000 | 3000 | 5000 | 3000 | 5000 | 5000 |
Want to Learn More? About Gas Insulated Switchgear!
Learn More: Applications of Gas Insulated Switchgear in Industry
