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Alarms and Events Processing

Alarms and Events Processing. Group No. 2 Project Guide: Prof. N.D.R.Sarma. Introduction. Alarm/Event processing –a key component of SCADA system. User is notified of the alarm generated and allows to take necessary action It adds security to the SCADA system.

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Alarms and Events Processing

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  1. Alarms and Events Processing Group No. 2 Project Guide: Prof. N.D.R.Sarma

  2. Introduction • Alarm/Event processing –a key component of SCADA system. • User is notified of the alarm generated and allows to take necessary action • It adds security to the SCADA system. • It traces the exceptional behaviors in devices and their values like current and voltage. • It allows remote monitors and control the field devices.

  3. Alarm Requirements • Alarms are raised at any ‘point’ in the SCADA system, when the value exceeds a particular range. • The range can be dynamically changed depending on conditions. • There should be stages of severity and categories of alarms. • Alarms are displayed online. • Alarms needs user intervention. • Alarm may be enabled, disabled or scheduled for a particular time .

  4. Alarm Requirements • Alarm are moved from unacknowledged list to acknowledged list as soon as they are processed by the user • An alarm should not be erased before the user takes appropriate actions • Alarms should be sorted according to order of priority before displaying it. • Display of historical and current alarms.

  5. Alarm Categorization and Priority • Alarms are classified as acknowledged/unacknowledged. • Depending on the value we can prioritize the alarm. • Alarm can be categorized based on Current , Voltage , Transformer ,substation , feeder level etc . • Alarm categorization based on severity or priority . Level 1 Alarms → Audible + Onscreen Display in Red (very very high alarm or very very low alarm ) Level 2 Alarms → Onscreen Display in Blue (very high alarm or very low alarm ) Level 3 Alarms → Onscreen Display in Green (high alarm or low alarm )

  6. Event Requirements • Events are also like alarms but can be generated even when the value is within the ‘safe’ range. • Events should be logged into the database • Events are in fixed format. • Events are stored with date, time etc. into the database and does not need user intervention or acknowledgement . • Events in the past can be searched. • Events don’t have priorities.

  7. System Design Modules • Generator Module • Alarm and Event Monitoring and Control • Alarm/Event Reporting and Processing ( GUI ) • Alarms/Events Logging (Database)

  8. System Design

  9. Generator Module • A data generating routine ( a simulator of the field values received from RTU) used to feed the data. • Generates random values of Device ID , Event ID , Value , SCADA-point etc . according to some format (Lit-ID) : V_065_IIIT_001_30/09/2004_12:00

  10. Alarm and Event Monitoring and Control • Reads values generated by simulator in fixed time interval . • The value is checked for the limits and status, associated with alarms/events. • Depending on weather and other parameters limit checks are performed. • If it is an alarm/event, message is given to the GUI to display it and logged into database .

  11. Alarm and Event Monitoring and Control • Controls and coordinates the Generator, GUI and database . • It runs the simulator, handles interfaces between modules . • Refreshes the GUI periodically . • Addition and Updating of the database are done through it.

  12. Alarm/Event Reporting and Processing ( GUI ) • Automatically report alarms/events to the interface with their category, severity, time-stamp etc . • Dynamically updating a display window with time varying data. • Allows user to perform alarm processing like • Searching for alarm and event depending on their types , categories, time-stamp etc . • Update the limits for detection • Acknowledge / Delete specific or all alarms • Display the events for various time periods, by a particular SCADA point, priority etc.

  13. Alarms/Events Logging (Database) • The database acts as a repository of each generated values which are later analyzed and displayed for decision making mechanisms or search queries . • The data from field is analog and stored in the database as both analog and digital with their type defined. • Storage of Events related data in user defined format in database in minute , hourly , daily , weekly basis with its status.

  14. Alarms/Events Logging (Database) • Database stores • Limits • Alarms and its related data like • Alarm Date and Time ,Acknowledgement Date Message ,Value , Alarm Type , Alarm Id , Device Name or ID , Alarm status , acceptor name • Events and its related data like • Event Date and Time , Message, Value, Event Type , Device Name or ID , Event Id etc

  15. Summary • Alarm/Event monitoring system periodically collects the data from the Generator . • Control system checks the values and sends to GUI. • Values are logged into the database depending upon their range. • GUI shows current alarms and events by getting values every n seconds • User performs multiple processing on alarms.

  16. QUESTIONS ?

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