What is an advantage of a Blocking Carrier Scheme?

The advantage of a Blocking Carrier Scheme lies in its capability to facilitate high-speed fault clearing to the end of the line. In this scheme, when a fault is detected, a blocking signal is transmitted along the line to prevent the operation of protective relays upstream. This allows for the detection and isolation of faults with minimal delay, ensuring that the system can respond quickly and effectively to disturbances.

The high-speed aspect is crucial in transmission networks, where rapid fault clearing can mitigate the impact of faults on system stability and reliability. By efficiently identifying and isolating faults at the end of the line, the Blocking Carrier Scheme helps to maintain grid integrity and prevent larger scale outages. This is particularly important in high voltage transmission systems where delays in fault clearing can lead to more significant grid issues.

Overall, the Blocking Carrier Scheme represents a sophisticated approach to transmission system protection, enhancing operational efficiency and reliability.