ABB PTMV 1 2020 12 08 Overhead Distribution

Improving Distribution Reliability with Reclosers The Example Distribution Circuit n Typical of suburban/rural circuits n 10 miles of 3 -Phase 13. 8 k. V Main Feeder n 8 single-phase laterals, evenly distributed on the main feeder. Each lateral 3 miles long, and connected to the main feeder through a fuse n A total of 1800 customers (8 x 225 customers/lateral) Distribution Substation 10 miles 3 miles © ABB PTMV - 2 115 k. V 13. 8 k. V ABB

Basic Radial System Case 1 10 miles Substation SAIFI: 1. 6 int/cust/yr SAIDI: 3. 3 hrs/yr MAIFI: 8. 7 mom/yr R Recloser Case 2 Substation 5 miles R SAIFI: 1. 2 int/cust/yr SAIDI: 2. 6 hrs/yr MAIFI: 6. 5 mom/yr Recloser Case 2 - with Single-Pole Reclosing Single phase Substation 5 miles © ABB PTMV - 3 R Recloser 5 miles R SAIFI: 1. 1 int/cust/yr SAIDI: 2. 3 hrs/yr MAIFI: 5. 4 mom/yr ABB

Loop Configuration with Manual Switch Case 3 Substation 1 5 miles R Manual Tie Switch Substation 2 SAIFI: 1. 2 int/cust/yr SAIDI: 2. 3 hrs/yr MAIFI: 6. 5 mom/yr © ABB PTMV - 4 R Assumptions • Circuit breakers have reclosing capability • Manual Tie Switch requires 1 hour to switch • Reclosers require 1 minute to switch ABB

Loop Configuration with Manual Switch Case 3 - With Single-Pole Reclosing Substation 1 5 miles R Manual Tie Switch Substation 2 SAIFI: 1. 1 int/cust/yr SAIDI: 2. 0 hrs/yr MAIFI: 5. 4 mom/yr © ABB PTMV - 5 R 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 ABB

Automatic Loop Restoration - 3 Reclosers Case 4 Substation 1 5 miles R N. C. Recloser Substation 2 R N. O. Recloser SAIFI: 1. 0 int/cust/yr SAIDI: 2. 1 hrs/yr MAIFI: 6. 8 mom/yr R N. C. Recloser © ABB PTMV - 6 N. C. - Normally-Closed N. O. - Normally-Open Assumptions • Circuit breakers have reclosing capability • Reclosers require 1 minute to switch ABB

Automatic Loop Restoration - 3 Reclosers Case 4 - With Single-Pole Reclosing Substation 1 5 miles R N. C. Recloser Substation 2 R N. O. Recloser SAIFI: 0. 8 int/cust/yr SAIDI: 1. 8 hrs/yr MAIFI: 3. 1 mom/yr R N. C. Recloser © ABB PTMV - 7 N. C. - Normally-Closed N. O. - Normally-Open Assumptions • Circuit breakers have reclosing capability • Reclosers require 1 minute to switch ABB

Automatic Loop Restoration - 5 Reclosers Case 5 Substation 1 3. 3 miles R R N. C. Recloser Substation 2 R N. O. Recloser © ABB PTMV - 8 N. C. - Normally-Closed N. O. - Normally-Open Assumptions • Circuit breakers have reclosing capability • Reclosers require 1 minute to switch SAIFI: 0. 8 int/cust/yr SAIDI: 1. 7 hrs/yr MAIFI: 6. 5 mom/yr ABB

Automatic Loop Restoration - 5 Reclosers Case 5 - With Single-Pole Reclosing Substation 1 3. 3 miles R R N. C. Recloser Substation 2 R N. O. Recloser © ABB PTMV - 9 N. C. - Normally-Closed N. O. - Normally-Open Assumptions • Circuit breakers have reclosing capability • Reclosers require 1 minute to switch SAIFI: 0. 6 int/cust/yr SAIDI: 1. 4 hrs/yr MAIFI: 2. 7 mom/yr ABB

© ABB PTMV - 10 Benefits of Single-Pole Reclosing ABB

Summary of Reclosing Benefits with Single Phase Hrs/Yr %* Case 1 - Substation reclosing 3. 3 3 phase only R --- 3. 3 --- Single phase R R Case 2 - Line Recloser 2. 6 21% 2. 3 30% Case 3 - Loop with Manual Switch 2. 3 30% 2. 0 39% Case 4 - 3 -Recloser Automatic 2. 1 Loop Restoration 36% 1. 8 45% Case 5 - 5 -Recloser Automatic 1. 7 Loop Restoration 48% 1. 4 58% R R R R © ABB PTMV - 11 R R *% Improvement as compared to Case 1 ABB

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