What are the two types of SF6 circuit breakers?

The correct choice highlights the two main designs of SF6 circuit breakers: dead tank and live tank. In a dead tank design, the circuit breaker is enclosed in a tank that is at earth potential, which ensures that the high-voltage components are isolated from the surrounding environment. This design is typically used for substations and outdoor applications, as it provides a sturdy and safe enclosure for the high-voltage parts.

On the other hand, the live tank design keeps the circuit breaker components at the same potential as the energized conductor, which allows for a more compact design. This type is often used in smaller substations or in situations where space is limited. Both types effectively utilize SF6 gas as an insulating and interrupting medium due to its excellent electrical properties.

Understanding these designs is crucial for professionals in power distribution, as they cater to different installation scenarios and operational requirements.