Compensator distance relaying: Part I — General principles of operation

THE COMPENSATOR distance relaying scheme is a new and different approach to the problem of relaying interphase faults on transmission lines. It differs from conventional distance relaying in that no one relay is assigned to any particular phase. Instead, one polyphase unit responds to all phase-to-phase faults, and a second polyphase unit responds to 3-phase faults. Between the two of these units, one or the other or both will respond to any 2-phase-to-ground within the desired zone of protection.