MON.ITA HVDC Link AC & DC Protection System

This paper describes the protection system of MON.ITA HVDC Link in all its parts, which has been designed taking into account the different configuration possibilities. AC protection relays, including AC connections, filters and transformers 400/205/205 kV and DC protection relays are presented with a functional description of the entire protection system. Regarding DC part, the protections of AC/DC conversion system, DC Cables and Common Neutral system are reviewed. General protection criteria, adopted schemes to manage main critical events and operating sequences to stop AC/DC conversion, depending on the severity of the fault, are explained.