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Medium voltage metal enclosed switchgear is available in two insulation modes: one uses air insulation, and the other employs compressed gas insulation. The former has been around for a longer time and is commonly referred to as switchgear. The latter is typically known as gas insulated switchgear.
Gas insulated switchgear, often referred to as GIS, entails sealing high-voltage components (such as circuit breakers, disconnect switches, load switches, grounding switches, transformers, busbars, and more) within a closed metal enclosure filled with compressed gas at low pressure (such as compressed air, SF6, N2, etc.). This article primarily discusses medium voltage SF6 gas insulated switchgear, hereinafter referred to as GIS.
GIS offers numerous advantages when compared to conventional air insulated switchgear:
Firstly, the use of high-performance compressed gas significantly enhances insulation capabilities, with gas insulation performing 2 to 3 times better than air insulation. This advantage facilitates the design of smaller enclosure sizes, promoting compactness.
Secondly, the use of high-performance compressed gas can sometimes enhance arc-quenching performance.
Furthermore, due to its sealed design, GIS is unaffected by external environmental factors such as condensation, pollution, small animals, and chemical substances, making it suitable for harsh environments.
Lastly, GIS employs a maintenance-free product structure, which significantly reduces maintenance efforts and associated costs.
C: Cable Switch |
F: Cable Switch with Fuse |
De: Direct Cable Connection with Earthing |
V: Vacuum Circuit Breaker |
D: Direct Cable Connection |
M: Metering Module |
Dimension:375(W)*751(D)*1336(H) |
The SF6 Single Cell |
The SF6 Common Cell |
The Metal Plate |
The Complete Product |
Outdoor Protective Cover
Welding area |
SF6 cell assemble area |
Daily Clean Up |