발전소 고압드럼 수위조절밸브 상태감시를 위한 운전영역기반 조건부 마스킹지수 산정에 관한 연구

초록

Control valves are final control elements in power plants, but closed-loop compensation can obscure early valvecondition changes in alarms and operating trends. This study proposes an operating-region-based ConditionalMasking Index (CMI) using Distributed Control System (DCS) and historian data without additional sensors. Comparableload and valve-opening regions were selected, and physical indicators were scored using reference-periodquantiles and integrated into a 0~100 CMI. In the low-load region, the median CMI increased from 1.22 to 83.20in Unit #1 and from 2.30 to 81.82 in Unit #2, temporally consistent with positioner adjustment and inspectionrecords. In the high-load region, CMI remained near 20. The results show that CMI can quantify condition changesmasked by closed-loop control and support maintenance review

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