1. PEPCO’s Experience with Historian EMS Users Group March 14, 2000 Potomac Electric Power Company

2. PEPCO Needs PEPCO Needs Electric system data archiveElectric system data archive Corporate wide EMS data accessCorporate wide EMS data access –Operations –Planning –Maintenance Data securityData security

3. Historian System Collects & stores real time data from Energy Management System for archivalCollects & stores real time data from Energy Management System for archival Architecture is client/serverArchitecture is client/server Uses multiple compression algorithmsUses multiple compression algorithms

4. Historian Features Collects the following data types with quality:Collects the following data types with quality: –Status –Analogs –Accumulator –Data from the Ranger Integrated Data Base (IDB) Provides interface to PC based commercial software (Excel, Word, etc.)Provides interface to PC based commercial software (Excel, Word, etc.)

5. Historian Features (Cont.) Provides input to applications such as load forecast, state estimation, etc.Provides input to applications such as load forecast, state estimation, etc. Output in tabular or graphic formOutput in tabular or graphic form Provides securityProvides security

6. EMS Data Base HistoricalDataBase SCADA EMS Applications Microsoft EXCEL Data flow overviewData flow overview Historian System

7. PEPCO Historian Users Operations Operations Planning Planning Maintenance Maintenance

8. Use of Historian for Operations Track current electric system conditionsTrack current electric system conditions –Spreadsheet (tabular) –One line (graphical display) Power Flow/Contingency AnalysisPower Flow/Contingency Analysis Retrieve historical data for switching decisionsRetrieve historical data for switching decisions Trend line loading and voltagesTrend line loading and voltages Clearance workClearance work

9. Use of Historian for Planning Monitor equipment performanceMonitor equipment performance Track system load and power factor profiles used in construction recommendationsTrack system load and power factor profiles used in construction recommendations Power flow/contingency analysisPower flow/contingency analysis Calculate electric system lossesCalculate electric system losses

10. Use of Historian for Maintenance For PEPCO’s new Maintenance Management SystemFor PEPCO’s new Maintenance Management System –Help transition from preventive to predictive/proactive maintenance approach

11. Pepco’s IMMS Desired System Set Up

12. Maintenance System Payoff Preparation for changing utility operationsPreparation for changing utility operations Better track maintenance history and maintenance patternsBetter track maintenance history and maintenance patterns Better utilize work force for multi-skilling effortsBetter utilize work force for multi-skilling efforts Provide better reliability of equipment readinessProvide better reliability of equipment readiness

13. Historian Examples Excel spreadsheetsExcel spreadsheets One-linesOne-lines Charts and graphsCharts and graphs

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28. Operations Emergency Example

31. Historian One-Line Example

33. Frequency Deviation Example

34. Historian Excel Example

35. Lambda vs LMP Comparison Lambda LMP

36. LMP and Transmission Congestion Four Representative LMPs--When Identical, No Transmission Congestion

37. Transfer Limits and Actual Flows from PJM OASIS

38. Future Historian Uses Study State EstimationStudy State Estimation Distribution AutomationDistribution Automation External/outside utility data storageExternal/outside utility data storage

39. Summary Has capabilities that meet Pepco’s needs for data archiving, data access and data securityHas capabilities that meet Pepco’s needs for data archiving, data access and data security Excel interface provides for PC data analysis and graphical charting optionsExcel interface provides for PC data analysis and graphical charting options Large potential for future usesLarge potential for future uses