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Overhead Distribution Systems

Overhead Distribution Systems. The Example Distribution Circuit. Typical of suburban/rural circuits 10 miles of 3-Phase 13.8 kV Main Feeder 8 single-phase laterals, evenly distributed on the main feeder. Each lateral 3 miles long, and connected to the main feeder through a fuse

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Overhead Distribution Systems

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  1. Overhead Distribution Systems

  2. The Example Distribution Circuit • Typical of suburban/rural circuits • 10 miles of 3-Phase 13.8 kV Main Feeder • 8 single-phase laterals, evenly distributed on the main feeder. Each lateral 3 miles long, and connected to the main feeder through a fuse • A total of 1800 customers (8 x 225 customers/lateral) Distribution Substation 10 miles 3 miles 115 kV 13.8 kV

  3. R Improving Distribution Reliability with Reclosers Basic Radial System Case 1 SAIFI: 4.3 int/cust/yr SAIDI: 8.8 hrs/yr MAIFI: 0.0 mom/yr 10 miles Substation Circuit Breaker with No Reclosing Capability Case 2 SAIFI: 1.6 int/cust/yr SAIDI: 3.3 hrs/yr MAIFI: 8.7 mom/yr 10 miles Substation Recloser

  4. R R R Use of Line Reclosers Case 3 SAIFI: 2.6 int/cust/yr SAIDI: 5.4 hrs/yr MAIFI: 2.1 mom/yr Substation 5 miles 5 miles Circuit Breaker with No Reclosing Capability Case 4 SAIFI: 1.2 int/cust/yr SAIDI: 2.6 hrs/yr MAIFI: 6.5 mom/yr Substation 5 miles 5 miles Recloser

  5. R R Loop Configuration with Manual Switch Case 5 Substation 1 5 miles 5 miles SAIFI: 1.2 int/cust/yr SAIDI: 2.3 hrs/yr MAIFI: 6.5 mom/yr Manual Tie Switch Substation 2 • Assumptions • Circuit breakers have reclosing capability • Manual Tie Switch requires 1 hour to switch • Reclosers require 1 minute to switch

  6. R R R Automatic Loop Restoration - 3 Reclosers Case 6 5 miles 5 miles Substation 1 SAIFI: 1.0 int/cust/yr SAIDI: 2.1 hrs/yr MAIFI: 6.8 mom/yr N.C. Recloser N.O. Recloser Substation 2 N.C. Recloser N.C. - Normally-Closed N.O. - Normally-Open • Assumptions • Circuit breakers have reclosing capability • Reclosers require 1 minute to switch

  7. R R R R R Automatic Loop Restoration - 5 Reclosers Case 7 3.3 miles 3.3 miles 3.3 miles Substation 1 N.C. Recloser N.C. Recloser N.O. Recloser Substation 2 N.C. Recloser N.C. Recloser N.C. - Normally-Closed N.O. - Normally-Open SAIFI: 0.8 int/cust/yr SAIDI: 1.7 hrs/yr MAIFI: 6.5 mom/yr • Assumptions • Circuit breakers have reclosing capability • Reclosers require 1 minute to switch

  8. R R R R R R R R R R R R R Summary of Reclosing Benefits Hrs/Yr%* 8.8 ---- Case 1 - No reclosing 3.3 63% Case 2 - Substation reclosing 2.6 70% Case 4 - Line Recloser 2.3 74% Case 5 - Loop with Manual Switch 2.1 76% Case 6 - 3-Recloser Automatic Loop Restoration 1.7 81% Case 7 - 5-Recloser Automatic Loop Restoration *% Improvement as compared to Case 1

  9. R R R Automatic Loop Restoration - 3 Reclosers ***With Single-Pole Reclosing*** 5 miles 5 miles Substation 1 SAIFI: 0.8 int/cust/yr SAIDI: 1.8 hrs/yr MAIFI: 3.1 mom/yr N.C. Recloser N.O. Recloser Substation 2 N.C. Recloser N.C. - Normally-Closed N.O. - Normally-Open • Assumptions • Circuit breakers have reclosing capability • Reclosers require 1 minute to switch

  10. R R R R R Automatic Loop Restoration - 5 Reclosers ***With Single-Pole Reclosing*** 3.3 miles 3.3 miles 3.3 miles Substation 1 N.C. Recloser N.C. Recloser N.O. Recloser Substation 2 N.C. Recloser N.C. Recloser N.C. - Normally-Closed N.O. - Normally-Open SAIFI: 0.6 int/cust/yr SAIDI: 1.4 hrs/yr MAIFI: 2.7 mom/yr • Assumptions • Circuit breakers have reclosing capability • Reclosers require 1 minute to switch

  11. Benefits of Single-Pole Reclosing

  12. Predictive Reliability Analysis ABB Consulting’s Performance AdvantageTM Software Useful for: • Looking at system configuration and design • Placement of protective devices • Impacts of changes in failure rates and restoration times • Analyzing system reliability from a graphical perspectiveand determining the most cost-effective solutions

  13. Improving Distribution Reliability ABB is the ONLY supplier that can do this in all of the above schemes!

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