Substation reliability is critical for overall system reliability. Failure events at main grid substations can lead to multiple outages with possible cascading consequences and widespread loss of customer load. This article presents a review of the existing literature of substation reliability analysis, which shows that considerable knowledge has been gained from the application of primarily analytical methods. The complexity, however, of substation switching operations does not lend itself to pure analytical treatment. Simulation methods are more suitable as the mathematical modeling of the relationship between events and outcomes is not always possible.
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