Improving System Safety Modelling in accordance to IEC 61508 by using Monte Carlo Simulations

Responsiveness of Multi-Channel IEC-61850 Substation Communication Network Reliability Performance to Changes in Repair Factors

“…The reliability of electrical protection system in a power distribution centre of a process plant is equally important if not more than the need of maintaining the continuous supply power to the various parts of the plant to ensure process continuity. Hence, repairable multi-channel IEC-61850 based SCN schemes with a minimum of 'one-out-of-two' voting capability are employed to ensure that a single point of failure in the protection scheme does not result in the scheme being inoperable [19], [20]; this configuration enables one channel to be isolated for repairs while the other channel is in service [21], [22]. Two independent channels (viz.…”

“…Since the proportional effectiveness (elasticity) o f to is given by (21), the elasticity of vectors to is given by (22) [55], [57].…”

Mission Critical Safety Functions in IEC-61850 Based Substation Automation System - A Reliability Review

“…Monte Carlo Simulation (MCS) can also be used to evaluate reliability and availability of fault tolerant repairable systems, however high number of simulation cycles is required in order to produce statistically meaningful results. Furthermore, minor system changes require the simulations to be rerun at a considerable cost [36], [37]. Markov Chain (MC) analysis method however, does not have the above-mentioned limitations since all sequence dependent events are included naturally in the model [36].…”

Reliability and Availability of Multi-Channel IEC-61850 Substation Communication Networks for Mission-Critical Applications

“…increase the reliability and availability of the overall system. This configuration ensures that the independent scheme channels are repairable without having to completely isolate the whole protection scheme [19], [20]. Fig.…”