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EE 653 RELIABILITY PROJECT

EE 653 RELIABILITY PROJECT. HISTORICAL DISTRIBUTION SYSTEM RELIABILITY ASSESSMENT Presented by: Muhammed Rahim MidAmerican Energy Company Davenport, IA. INTRODUCTION. Importance of Reliability in Power Systems Distribution System Reliability Assessment Types of Reliability Assessments

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EE 653 RELIABILITY PROJECT

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  1. EE 653 RELIABILITY PROJECT HISTORICAL DISTRIBUTION SYSTEM RELIABILITY ASSESSMENT Presented by: Muhammed Rahim MidAmerican Energy Company Davenport, IA

  2. INTRODUCTION • Importance of Reliability in Power Systems • Distribution System Reliability Assessment • Types of Reliability Assessments - Historical Reliability Assessment - Predictive Reliability Assessment

  3. HISTORICAL ASSESSMENT • What is Historical Reliability Assessment? • Importance of Historical Reliability Assessment • Indices used in Historical Reliability Assessment: SAIFI, SAIDI and CAIDI

  4. SAIFI, SAIDI & CAIDI • SAIFI =TOTAL CUSTOMER INTERRUPTIONS/TOTAL CUSTOMERS SERVED • SAIDI = TOTAL CUSTOMER-HOURS OF INTERRUPTIONS/TOTAL CUSTOMERS SERVED • CAIDI = TOTAL CUSTOMER-HOURS OF INTERRUPTIONS/TOTAL CUSTOMER INTERRUPTIONS

  5. DISTRIBUTION SYSTEM PERFORMANCE • Example presented is derived from a typical utility (XYZ) – 1997 to 2000 • XYZ Corporate Level • XYZ Regional Level: North, Central and South • XYZ Individual Feeder Circuit Level

  6. CLASSIFICATION OF INTERRUPTION • Transmission/Substation • Tree Contacts • Equipment Overhead/Underground • Weather • Utility Error • Public • Animal • Unknown/Other

  7. SUB-COMPONENT FAILURES • Substation Breakers • Transformers • Conductors • Arresters • Fuses • Insulators

  8. XYZ CORPORATE LEVEL RELIABILITY

  9. SAIFI contributions for the XYZ system 0.6000 0.5000 0.4000 1997 0.3000 1998 1999 2000 0.2000 0.1000 0.0000 trees animals OH public UG other xyz_err subst weather transmission

  10. SAIDI contributions for XYZ system 45.0000 40.0000 35.0000 30.0000 1997 25.0000 1998 1999 20.0000 2000 15.0000 10.0000 5.0000 0.0000 OH UG trees other subst public xyz_err animals weather transmission

  11. SAIFI contributions for XYZ system 0.0800 0.0700 0.0600 0.0500 1997 1998 0.0400 1999 2000 0.0300 0.0200 0.0100 0.0000 fuse pole other cable arrestor insulator conductor transformer line hardware subs. Breaker

  12. SAIDI contributions for XYZ system 10.0000 9.0000 8.0000 7.0000 1997 6.0000 1998 5.0000 1999 4.0000 2000 3.0000 2.0000 1.0000 0.0000 fuse pole other cable arrestor insulator conductor transformer line hardware subs. Breaker

  13. COMPARISONS

  14. XYZ NORTH REGION RELIABILITY

  15. SAIFI contributions to North region 0.5000 0.4500 0.4000 0.3500 1997 0.3000 1998 0.2500 1999 0.2000 2000 0.1500 0.1000 0.0500 0.0000 OH UG trees other subst public xyz_err animals weather transmission

  16. SAIDI contributions for Northern region 7.0000 6.0000 5.0000 1997 4.0000 1998 1999 3.0000 2000 2.0000 1.0000 0.0000 fuse pole other cable arrestor insulator conductor transformer line hardware subs. Breaker

  17. XYZ CENTRAL REGION RELIABILITY

  18. SAIFI contributions for Central region 0.4500 0.4000 0.3500 0.3000 1997 0.2500 1998 1999 0.2000 2000 0.1500 0.1000 0.0500 0.0000 other subst public trees OH UG xyz_err animals weather transmission

  19. SAIDI contributions for Central region 16.0000 14.0000 12.0000 10.0000 1997 1998 8.0000 1999 2000 6.0000 4.0000 2.0000 0.0000 fuse pole other cable insulator transformer arrestor conductor line hardware subs. Breaker

  20. XYZ SOUTHERN REGION RELIABILITY

  21. SAIFI contributions for Southern region 0.7000 0.6000 0.5000 1997 0.4000 1998 1999 0.3000 2000 0.2000 0.1000 0.0000 trees other subst public animals weather OH UG xyz_err transmission

  22. SAIDI contributions for Southern region 12.0000 10.0000 8.0000 1997 1998 6.0000 1999 2000 4.0000 2.0000 0.0000 fuse pole other cable arrestor insulator conductor transformer line hardware subs. Breaker

  23. INDIVIDUAL FEEDER RELIABILITY • Random Feeder chosen had the following reliability – CAIDI: 132.46, SAIDI: 288.97, SAIFI: 2.1815 • Feeder Reliability versus System Reliability • “Upgrade” required and performed

  24. INDIVIDUAL FEEDER RELIABILITY (CONT’D) • List of 20 worst circuits prepared each year based on the reliability indices, for maintenance and “upgrade”. • SAIFI, SAIDI, and CAIDI calculated for a given time period • Indices assigned ranking values in terms of the proposed indices goal values • Calculate combine ranking for each circuit by adding up the individual indices ranking values.

  25. CONCLUSION • The distribution system makes the greatest individual contribution to the unavailability of supply to a customer • The calculated performance statistics aid in the planning, operating and maintaining the distribution systems.

  26. QUESTIONS?

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