Multiplicative method for assessing the technical condition of switching bay devices in a substation using maintenance prioritiesRibič, Janez (Avtor) Štumberger, Gorazd (Avtor) Vodenik, Marko (Avtor) Kerin, Uroš (Avtor) Bečan, Miha (Avtor) Šketa, Anja (Avtor) Bokal, Drago (Avtor) Kitak, Peter (Avtor) condition-based maintenancehealth indexcircuit breakerdisconnectorinstrument transformersubstationfailure mode analysisThe results of the presented research are directly applicable to enhancing the maintenance strategies of transmission system operator (TSO) assets, particularly high-voltage switchyard equipment, and are extendable to other TSO systems. Furthermore, the proposed methodology lays the groundwork for the implementation of predictive maintenance. This paper introduces a novel methodology for assessing the technical condition of high-voltage switchyard devices—specifically, circuit breakers, disconnectors, and instrument transformers—within a high-voltage switching bay. The proposed model integrates multiplicative criteria, which reflect maintenance actions, and additive criteria, which capture the operational and maintenance history of individual devices. Supported by a newly developed data model, the methodology enables an automated assessment process that generates a c-curve representing the condition trajectory of each device or device type. Leveraging real-time data from the maintenance information system, this automated approach allows for the timely evaluation of a device’s technical state prior to scheduled maintenance. The resulting c-curve analysis supports strategic maintenance planning and prioritization. The proposed solutions have been implemented experimentally by TSO ELES.MDPI20252025-06-23 14:39:05Članek v reviji93385sl