Which type of current transformer is typically used within circuit breakers?

The type of current transformer typically used within circuit breakers is the bushing current transformer. Bushing current transformers are specifically designed to measure the current flowing through high-voltage bushings. They are installed directly on the bushing of a circuit breaker or transformer to provide an accurate representation of the load current for protective relaying and metering purposes.

Bushing current transformers offer several advantages, including the ability to maintain performance under high voltage, compact design, and enhanced accuracy needed for critical protection schemes in power systems. They allow for continuous monitoring of the current without interrupting the power supply, which is essential for system reliability and safety.

While the other current transformer types, such as core, Rogowski coil, and splitter, have their own applications in wiring and measuring systems, they are not typically used directly within circuit breakers in the same way that bushing current transformers are.