What Is a Dry / SF6 (Gas-Filled) Bushing?
Quick answer — An SF6 (gas-filled) or dry bushing uses compressed SF6 gas or a solid insulation (RIP/RIS) instead of oil as the insulation between the conductor and the grounded housing. It is used in GIS, gas-insulated equipment and where no oil is wanted, being compact, leak-and-fire-safe and pollution-resistant. The insulation largely uses a gas or a solid core, so it suits sealed and indoor applications.
What is an SF6 or gas-insulated bushing?
Why use it
SF6 and dry bushings need no oil, are compact, have a high dielectric strength and a low fire risk, and suit GIS and sealed, indoor or pollution-prone sites.
Construction
The core is a gas (SF6) gap or a solid resin-impregnated (RIP/RIS) insulation; the interface with the GIS or a transformer tank must be compatible.
Considerations
SF6 is a greenhouse gas, so it must be handled and recycled; dry/solid bushings avoid that but can be more sensitive to moisture and PD.
References & standards
- IEC 60137 (bushings)
- IEC 60076-1
Related
Related manufacturers
Prolec GE (GE Vernova) · Prolec GE Waukesha · Hitachi Energy USA · Siemens Energy · Eaton · Virginia Transformer Corp
Related components
Technical content is prepared from engineering references, standards frameworks, manufacturer documentation and industry sources. Contractual or compliance decisions should refer to current official standards. TransformerPath Technical Editorial.
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