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while one of the strongest points in a power system is the substation, it still contains what can be described as weak points or points of failure that could lead to major outages. Present paper examines the impact of Superconducting Fault Current Limiter (SFCL) on the transmission substation reliability. To this end, potential application of a SFCL in a practical 138kV transmission grid is studied from the reliability point of view and numerical results are presented. The concept of failure modes and effects analysis is used in deriving the study results presented in the paper. Results of the investigation show that using SFCLs makes a significant improvement in the load point reliability in addition to improving the power system dynamics.

One of the important aspects of smart grid is to make the best use of existing assets. One way (among others) to achieve this objective is by scheduling effective maintenance routines. Abnormal conditions, including short circuits or overloads, would affect not only the exposed components, but also those farther away from the fault locations. This exposure may cause some of the components fail right away or at a later time. Therefore, the severity, frequency, and timings of system faults are important factors in planning maintenance programs. In this paper, the impact of increased current flows, in the form of short circuits and overloads, on component failure rates are studied and a maintenance scheduling model taking into account such impacts is developed. Using the developed model, the optimum mean time to preventive maintenance is derived and used to maximize the components availability. Results of this paper would help in preventing damage to the equipment by optimally scheduling maintenance programs based on short circuit current levels of the system.

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