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Overhead Distribution Systems

Overhead Distribution Systems. Improving Distribution Reliability with Reclosers. The Example Distribution Circuit Typical of suburban/rural circuits 10 miles of 3-Phase 13.8 kV Main Feeder

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Overhead Distribution Systems

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  1. Overhead Distribution Systems

  2. Improving Distribution Reliability with Reclosers 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. Case 1 10 miles Substation SAIFI: 1.6 int/cust/yr SAIDI: 3.3 hrs/yr MAIFI: 8.7 mom/yr Recloser Case 2 SAIFI: 1.2 int/cust/yr SAIDI: 2.6 hrs/yr MAIFI: 6.5 mom/yr Case 2 - with Single-Pole Reclosing Substation Substation 5 miles 5 miles 5 miles 5 miles Single phase SAIFI: 1.1 int/cust/yr SAIDI: 2.3 hrs/yr MAIFI: 5.4 mom/yr R R R R R Recloser Recloser Basic Radial System

  4. R R Loop Configuration with Manual Switch Case 3 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

  5. R R Loop Configuration with Manual Switch Case 3 - With Single-Pole Reclosing Substation 1 5 miles 5 miles SAIFI: 1.1 int/cust/yr SAIDI: 2.0 hrs/yr MAIFI: 5.4 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 and have single-pole capability

  6. R R R Automatic Loop Restoration - 3 Reclosers Case 4 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 Automatic Loop Restoration - 3 Reclosers Case 4 - 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

  8. R R R R R Automatic Loop Restoration - 5 Reclosers Case 5 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

  9. R R R R R Automatic Loop Restoration - 5 Reclosers Case 5 - 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

  10. Benefits of Single-Pole Reclosing

  11. Case 1 - Substation reclosing 3 phase only Case 2 - Line Recloser Case 3 - Loop with Manual Switch Case 4 - 3-Recloser Automatic Loop Restoration Case 5 - 5-Recloser Automatic Loop Restoration R R R R R R R R R R R R R Summary of Reclosing Benefits with Single Phase Hrs/Yr%* Hrs/Yr%* 3.3 --- 3.3 --- Single phase 2.6 21% 2.3 30% 2.3 30% 2.0 39% 2.1 36% 1.8 45% 1.7 48% 1.4 58% *% Improvement as compared to Case 1

  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

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