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Table 1 MTTF data of substation devices [36]

From: Reliability of IEC 61850 based substation communication network architecture considering quality of repairs and common cause failures

Intra-bay substation communication network devices MTTF (years)
Protection IED 150
Control IED 150
Ethernet switch (ESW) 50
Time synchronisation (TS) 150
Merging unit (MU) 150