Analysis of Service Aged Electromagnetic Protective Relays

For the investigation of failure behavior of electromechanical protective relays, a new evaluatio method has been developed. This method is a qualitative method nased on Failure Mode Effect and Criticality Analysis (FMECA) and the results of this investigation have been processed to: - a list of failures and causes for a specific type of electromechnanical protective relay - an evaluation of current and former maintenance policie