What describes the tripping of circuit breaker A at high speed when it detects a zone 2 fault outside its line section?

The tripping of circuit breaker A at high speed when it detects a zone 2 fault outside its line section indicates a misoperation because it is responding to a fault condition that it should not be detecting. In a properly functioning system, a circuit breaker is designed to trip only for fault conditions within its designated protection zone. When a zone 2 fault occurs outside its specific line section, the breaker’s immediate action could lead to unnecessary disconnection of the circuit, which is not aligned with the intended protective scheme.

Thus, such a rapid action in response to a fault outside of its protective jurisdiction constitutes a misoperation, as it does not adhere to the established engineering principles for appropriate fault detection and circuit isolation. Proper operation would involve coordination with other protective devices to ensure that only the relevant sections of the system are disconnected, avoiding broader impacts on the network's stability and reliability.