What is function of Circuit breaker in substation?

The function of a circuit breaker in a substation is to interrupt the flow of current when a fault occurs and restore it when the fault is cleared.

A circuit breaker consists of two main contacts: a fixed contact and a moving contact.

When a fault is detected, such as an overload or a short circuit, the contacts are separated by a mechanism that releases stored potential energy.

This creates an arc between the contacts, which is a highly ionized and conductive plasma.

The circuit breaker uses various methods to quench the arc, such as cooling, compressing, or replacing the ionized medium with fresh gas⁴.

Circuit breakers play a crucial role in substations to ensure safe and efficient operation.

They are responsible for isolating equipment for maintenance, clearing faults, and protecting equipment from overcurrents.

They also allow for selective isolation and switching of different parts of the power system for control purposes⁴.

If you want to learn more about circuit breakers, you can watch some videos from the search results, such as [Substations: Basic Principles | Circuit Breakers](^1^) or [Substation Circuit Breaker Testing](^3^).

You can also read more about the types and classifications of circuit breakers from the web results, such as [Circuit Breaker: What it is And How it Works | Electrical4U](^4^) or [Types of Circuit Breaker with Detailed Classifications | TheElectricalGuy](^2^).