This document summarizes a project by a Spanish transmission system operator to test interoperability under the IEC 61869-9 process bus standard. The project implemented a differential protection scheme (87L) on a 163km overhead transmission line, with one end using process bus approach and the other using conventional instrumentation. Non-conventional instrument transformers were installed at the process bus end to provide synchrophasor measurements to relays and a recorder. The project configuration achieved functionality in 2016 and provided experience operating the system, including lessons learned from 14 line tripping events. Keywords discussed include process bus, IEC 61850, IEC 61869-9, non-conventional instrument transformers, differential protection, and

Process Bus Interoperability Under IEC 61869-9 + Differential Protection (87L) Scheme With One Conventional End PDF

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