Busbar protection relay is designed for busbar protection in substations with the main protection function being low impedance differential protection. There are two types of busbar protection with different structures, namely centralized type and distributed (decentralized) type.
With centralized type, relay performs fast and stable centralized low- impedance busbar protection in transmission and utility systems, up to 24 bays (for single phase) and up to 8 bays (for 3 three phase). With decentralized type, relay is designed specifically to be the main unit of a distributed low-impedance busbar protection system to protect bus schemes up to 30 bays.
