Dependability Optimization of Process-level Protection in an IEC-61850-Based Substation
Résumé
Power substations are intensively renovated toward using information and communication technologies such as object oriented modeling and Ethernet networks. In the last two decades, Substation automation systems used capabilities of network communication services adopted from sophisticated international standardization such as IEC 61850. Distributed safety related functions take advantage of these technologies to protect the process-level equipment. Substation devices such as intelligent electronic devices, measurement units and circuit breaker controllers, with new capabilities, i.e. enabling IEC 61850, are integrated to build the protection and control functions that form the safety-related system. The objective of this research is to evaluate quantitatively the dependability for transformer protection architectures in the bay level.Safety integrity levels model, described in both IEC 62061 and IEC 61508, gives measurements for safety integrity levels according to the probability of failure. The determination of these levels is an approach to estimate system dependability.
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