Reliability and sensitivity analysis of motor protection system using fault tree method

Maintaining reliability of the electrical motors as large industrial loads in desirable level has special importance because electrical motors with low reliability and in result with inappropriate operation can cause heavy damages in the industrial plants. Appropriate operation of protection system is one of the factors to have desirable reliability of electrical motors in the power system. Components of protection system failure rate has vital role in appropriate operation of power system protection. Therefore, in this study, operation of electrical motor protection system from view of reliability has investigated using fault tree method. Availability, annual downtime and failure rate of motor protection subsystem and system is determined to reliability analysis of the motor protection system. Also, risk reduction worth index of motor protection system components is used for sensitivity analysis.