What are the structural features of gas-filled cabinets?

What are the structural features of gas-filled cabinets?

Globally, high-voltage gas-filled cabinets have experienced rapid development in recent years, with their use increasing dramatically. What is a gas-filled cabinet? A gas-filled cabinet is a type of switchgear that seals high-voltage components such as busbars, circuit breakers, and transformers within a housing filled with low-pressure sulfur hexafluoride or other gases. Gas-filled cabinets offer many advantages, including the use of compressed gas for insulation, which facilitates miniaturization. They are also immune to environmental influences such as animals, chemicals, and contaminants.

Different models of gas-filled cabinets share similar structural features. They primarily utilize fixed-type construction and maintenance-free vacuum circuit-breaking technology, replacing center-mounted, low-oil circuit breakers with limited operating times. They use high-performance sulfur hexaoxide gas insulation, replacing air insulation, eliminating the need for maintenance and repair of operating components and switchgear. Cable connections utilize fully insulated, shock-proof plug-in structures, replacing conventional cable connectors for enhanced safety. Combining a disconnector with an earthing switch, instead of a single switch, reduces space and reduces interlocking efforts.

The structural features of the sulfur hexafluoride insulated cabinet effectively protect it from external influences, allowing it to be used in locations where conventional air-insulated cabinets cannot, such as in seismic zones and highly chemically corrosive environments. This demonstrates its significant technological value.

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