What potential hazard is associated with adding SF6 gas to energized equipment?

Adding SF6 (sulfur hexafluoride) gas to energized equipment presents a particular hazard related to the potential for wet gas and ruptured bushings. SF6 is known for its excellent insulating properties and is widely used in high-voltage circuit breakers and switchgear. However, if the gas is not properly handled or if there is moisture present, it can lead to the creation of a wet gas condition. This moisture can reduce the effectiveness of the insulation and, in severe cases, cause the insulation to fail, leading to equipment breakdown.

Additionally, moisture within energized components can lead to internal arcing and cause bushings—components that insulate and support electrical conductors—to rupture. This not only compromises equipment safety and operation but can also pose significant safety hazards to personnel working in the vicinity. Understanding this risk is crucial for maintaining the integrity and safety of substation operations when handling SF6 gas.