SCADA and Alarm Management - DCE FEL ČVUT v Praze

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Philosophy Identification Rationalization Design Implementation Operation Maintenance Change Management Monitoring / Assessment Source: ISA 18.02 draft Alarm Management Life Cycle Audit Looking at the ISA 18.02 life cycle approach, Alarm Analysis plays an important role in monitoring, assessing and auditing the Alarm management system. What can we do with Alarm Analysis? Find alarms that do not function correctly Performance metrics Alarm Activity / Rates Frequent Alarm (bad Actors) Isolate and Analyze individual plant areas Analyze Plant upset or Alarm Flood Priority Distribution of Alarms Stale / Long Lasting Alarms Chattering Alarm General statistics on Alarms Performance Metrics with Industry guidelines (EEMUA) What is the Alarm Analysis Purpose? 13.12.2012 14
What Data is essential for Alarm Analysis • Date and Time of Events • Tag Name • Tag Type • Descriptions • Event Priority • Event Type (high Alarm, trip, failed) • Operator Action (Acknowledged, Return) • Value exceeded • Plant Area Code (optional) • Reporting Node (optional) • This data is obtained by different methods like OPC Alarm and Event Servers, manufacturer specific publishing server (via an API), etc. Outcome of Alarm Analysis. Alarm Activity Analysis – Average rate good indicator of the system health. – Unusual high activity levels are plotted in trend charts – Excessive events can be the result from abnormal conditions – 150 alarms per day are considered acceptable per the EEMUA guidelines – Over 300 are considered manageable – Anything outside of these metrics exposes the kind of load on the operator, which compromises safety and efficiency. – Measuring on an hourly basis can be quite effective in monitoring the alarm system performance . – Measuring alarms in a 10 min period can effectively identify the beginning of floods. Eg. 10 alarm in 10 minutes. – Additional activity parameters that are useful. • Days with max and min activity • Top Activity days • Percent of totals and accumulated percents • Alarms per hour, per shift, per day and per 10 minutes period with average max and min • Average alarm per hour for different priorities • Averages per hour with minimum and maximum 13.12.2012 15
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Page 13: What is EEMUA? • Stands for: The
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SCADA and Alarm Management - DCE FEL ČVUT v Praze

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