Circuit breaker in substation in Tunisia

What is a circuit breaker in a substation?

A circuit breaker in substation is a key component in electrical power systems, designed to interrupt the flow of electricity when a fault occurs, such as a short circuit or overload. Depending on system design, these devices can operate manually or automatically and come in various types, including air, vacuum, oil, and SF₆ gas.

What are the different types of circuit breaker?

The most common type is the air blast circuit breaker. These breakers use compressed air to extinguish an arc that has been created when the breaker is opened. Other types of circuit breakers include oil, vacuum, and solid state. There are different types of circuit breakers in substations.

What is an OCB in a high-voltage substation?

OCBs are used in high-voltage substations and have been popular in the past, although they are now being replaced by more modern technologies. Example: In a rural high-voltage substation serving a long transmission line, an OCB might be used to protect the line.

What is the difference between OBC and SF6 arc Breakers?

Oil (OCB) use insulating oil to suppress arcs. They are more common in legacy systems and require ongoing maintenance due to oil degradation. SF₆: These breakers, employed in high-voltage substations, use sulphur hexafluoride gas for superior arc quenching and insulation.