Short-Circuit Current Partitioning in HV Substations in Ring-Bus Arrangement with Redundancy

This paper proposes a way of reducing the short-circuit current stress imposed on individual circuit-breakers. A ring bus arrangement permits partitioning of the current, which is distributed between two circuit-breakers by splitting up the ring during fault clearing. This means that, in the ideal case, the circuit-breakers could be used up to fault levels of twice their rated interrupting capability. The "splitting" function is so easy to perform that any breaker can be expected to accomplish it with high reliability.