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11KV Medium Voltage Gas Insulated Switchgear
Cotenele is one of the main manufacturers of power distribution equipment in China,our products includes LV and MV switchgears,ring main units and their internal core components.The 11KV Medium Voltage Gas insulated Switchgear has a compact structure, is sturdy and durable, and has safe and stable performance. Widely used in urban power distribution, commercial buildings, wind and solar power plants, and industrial sites with limited space.
The gas-insulated switchgear is one of Cotenele’s key products. The 11KV Medium Voltage Gas Insulated Switchgear is a compact, metal-enclosed medium-voltage power distribution solution in which all live components, including circuit breakers, disconnectors, and busbars, are sealed inside a gas-tight stainless steel tank filled with insulating gas. This fully sealed design offers superior protection against environmental factors such as humidity, salt fog, dust, and small animals, ensuring that C-GIS performs reliably even under harsh conditions.
C-GIS is widely used in urban power distribution networks, high-rise buildings, underground substations, wind farms, solar plants, and industrial facilities where space is limited and reliability is crucial. Its combination of compactness, robustness, and low lifecycle cost makes it a preferred choice for medium-voltage distribution systems.
Cotenele’s C-GIS products comply with the following key national and international standards:
GB/T 11022
GB 3906
IEC 62271-200
IEC 62271-100
The technical parameters of the gas-insulated switchgear
| Parameter Category | Parameter Name | Value | Remarks |
| Basic Electrical | Rated Voltage | 12 KV | |
| Rated Frequency | 50/60 Hz | Optional | |
| Rated Current | 630～3150 A | Up to 4000A for special designs | |
| InsulationLevel |
1 min Power-Frequency Withstand Voltage (phase-to-phase &to ground) |
42 KV | Isolating break:48KV |
|
Lightning Impulse Withstand Voltage(phase- to-phase&to ground) |
75 KV | Isolating break:85KV | |
|
Auxiliary Circuit Power-Frequency Withstand Voltage |
2 KV | Control and auxiliary circuits | |
| Switching Capability | Rated Short-Circuit Breaking Current | 25/31.5/40 KA | Circuit breaker |
|
Rated Short-Time Withstand Current / Duration |
20～40 KA/3~4s | ||
| Rated Peak Withstand Current | 50～100 KA | Dynamic stability | |
| Rated Short-Circuit Making Current | 50～100 KA | ||
|
Rated Transfer Current (switch-fuse combination) |
1750 A | ||
| Mechanical&Sealing | Mechanical Life(Circuit Breaker) | ≥10,000 operations | Vacuum type |
| Mechanical Life(Load Switch) | ≥5,000 operations | SF₆puffer or vacuum | |
|
Mechanical Life(Disconnector/Earthing Switch) |
≥3,000 operations | Three-position switch | |
| SF₆Gas Rated Pressure(gauge at 20℃) | 0.02～0.05 MPa | ||
| SF₆Gas Annual Leakage Rate | ≤0.01%～0.1% | Industry-leading:≤0.01% | |
| Protection &Safety | Gas Compartment Protection Rating | IP67 | Dust-tight,temporary immersion |
| Enclosure Protection Rating | IP4X/IP41 | Protection >1mm solids | |
| Internal Arc Fault Withstand | 31.5 KA/0.5~1s | ||
|
Environmental Conditiors |
Ambient Temperature | -25℃~+40℃ | Wider range on request |
| Altitude | ≤3000 m | Derating above 1000m | |
| Relative Humidity | Daily avg≤95% | Monthly avg≤90% | |
| Typical Dimensions | Width ×Depth×Height | ~375~600×750~1400×1300~2500 mm | Varies by current rating |
What is the principle of the gas-insulated switchgear?
The main working principle of the 11KV Medium Voltage Gas Insulated Switchgear and ring main units is to physically isolate live parts from the external environment.
Working Principle:The live parts of gas-insulated switchgears or ring main units such as circuit breakers, disconnectors, and busbars are sealed inside a gas-tight stainless steel gas-box filled with pressurized insulating gas, which replaces traditional air as the insulating medium, making the equipment immune to environmental influences.
Insulation and Arc Extinguishing: The insulating gas in the gas-box(e.g., SF₆, N₂, dry air) provides excellent insulation. When the circuit opens, an arc is generated, and a vacuum interrupter efficiently quenches the arc to ensure safe disconnection.
Key Components: A typical C-GIS unit mainly consists of the gas tank, switching elements (vacuum circuit breaker, disconnector, etc.), operating mechanism, as well as a low-voltage control compartment and a cable compartment.
What are the advantages of gas-insulated switchgears or ring main units?
Compared with traditional air-insulated switchgear, 11KV Medium Voltage Gas Insulated Switchgear has many significant advantages.
Firstly, The pressurized insulating gas has a dielectric strength two to three times that of air, Using this sort of gas such as SF₆, N₂, dry air can significantly improve insulation performance. At higher voltage levels, this advantage is more pronounced, which has the feature of more compact size and this will help us to develop smaller, space saving devices.
Secondly, in addition to excellent insulation performance, The pressurized gas can also enhance arc extinguishing ability, this will improve circuit breaking performance.
Thirdly, the fully sealed and airtight structure enables the switchgear itself to resist external harmful environmental factors such as condensation, pollution, small animals, and chemical pollutants. Therefore, it can operate reliably in harsh or demanding environments. In 2002, a major flood occurred in the Elbe River in Germany, but the flooded inflatable switchgear units quickly resumed operation, demonstrating the reliable and safe operation capability of gas insulated cabinets in harsh environments.
Compared to traditional AIS, C-GIS shows significant advantages in several dimensions, but also has some limitations
What are the products advantages for the KYN61-40.5 switchgear?
| Aspect | C-GIS | AIS |
| Size &Footprint | Compact:About 1/3 the volume of AIS,greatly saving substation floor space. | Large:Requires substantial space for phase-to-phase and phase-to-ground clearances. |
|
Environmental Adaptability |
Excellent:Fully sealed,high protection rating,resistant to condensation,pollution,salt fog, and smallanimals.Ideal for harsh environments(outdoor,coastal,high altitude). | Poor:Open structure,susceptible to environmental conditions;prone to condensation faults in humid areas. |
| Maintenance Cost | VeryLow:Core components are maintenance-free,greatly reducing manual inspection and maintenance work;lower life-cycle cost. | Higher:Requires regular cleaning, inspection,and maintenance. |
| Safety | VeryHigh:Live parts fully enclosed,reducing risk of electric shock to operators;high operational safety. | Moderate:Live parts exposed, posing certain safety risks. |
|
Environmental Friendliness |
Trending:Traditional SF₆has high global warming potential,but new eco-friendly gases(dry air,N₂)are becoming mainstream,enabling "green"grids. | Better:No greenhouse gas emissions. |
| Initial Investment | Higher:Complex technology and high manufacturing precision lead to higher procurement cost than AIS. | Lower:Mature technology,relatively affordable. |
|
Maintenance Convenience |
Inconvenient:Internal components are not visible;internal faults are harder to locate and repair,leading to longer outage times. | Convenient:Components visible, faults easy to locate and replace. |
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