© ABB PTMV - 1, ABB Overhead Distribution Systems

© ABB PTMV - 2 ABB 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 115 kV13.8 kV 3 miles

© ABB PTMV - 3 ABB Basic Radial System Substation 10 miles Case 1 SAIFI: 1.6 int/cust/yr SAIDI: 3.3 hrs/yr MAIFI: 8.7 mom/yr Recloser R Case 2 Substation 5 miles Recloser R 5 miles R SAIFI: 1.2 int/cust/yr SAIDI: 2.6 hrs/yr MAIFI: 6.5 mom/yr Case 2 - with Single-Pole Reclosing Substation 5 miles Recloser R 5 miles R SAIFI: 1.1 int/cust/yr SAIDI: 2.3 hrs/yr MAIFI: 5.4 mom/yr Single phase

© ABB PTMV - 4 ABB Loop Configuration with Manual Switch Substation 1 SAIFI: 1.2 int/cust/yr SAIDI: 2.3 hrs/yr MAIFI: 6.5 mom/yr 5 miles Case 3 R 5 miles Substation 2 R Manual Tie Switch Assumptions Circuit breakers have reclosing capability Manual Tie Switch requires 1 hour to switch Reclosers require 1 minute to switch

© ABB PTMV - 5 ABB Loop Configuration with Manual Switch Substation 1 SAIFI: 1.1 int/cust/yr SAIDI: 2.0 hrs/yr MAIFI: 5.4 mom/yr 5 miles Case 3 - With Single-Pole Reclosing R 5 miles Substation 2 R Manual Tie Switch 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 PTMV - 6 ABB Automatic Loop Restoration - 3 Reclosers Substation 1 SAIFI: 1.0 int/cust/yr SAIDI: 2.1 hrs/yr MAIFI: 6.8 mom/yr 5 miles Case 4 R 5 miles Substation 2 R N.O. Recloser Assumptions Circuit breakers have reclosing capability Reclosers require 1 minute to switch R N.C. Recloser N.C. Recloser N.C. - Normally-Closed N.O. - Normally-Open

© ABB PTMV - 7 ABB Automatic Loop Restoration - 3 Reclosers Substation 1 SAIFI: 0.8 int/cust/yr SAIDI: 1.8 hrs/yr MAIFI: 3.1 mom/yr 5 miles R Substation 2 R N.O. Recloser Assumptions Circuit breakers have reclosing capability Reclosers require 1 minute to switch R N.C. Recloser N.C. Recloser N.C. - Normally-Closed N.O. - Normally-Open Case 4 - With Single-Pole Reclosing

© ABB PTMV - 8 ABB Automatic Loop Restoration - 5 Reclosers Substation 1 SAIFI: 0.8 int/cust/yr SAIDI: 1.7 hrs/yr MAIFI: 6.5 mom/yr 3.3 miles Case 5 R 3.3 miles Substation 2 R N.O. Recloser Assumptions Circuit breakers have reclosing capability Reclosers require 1 minute to switch R N.C. Recloser N.C. Recloser N.C. - Normally-Closed N.O. - Normally-Open R R N.C. Recloser N.C. Recloser 3.3 miles

© ABB PTMV - 9 ABB Automatic Loop Restoration - 5 Reclosers Substation 1 SAIFI: 0.6 int/cust/yr SAIDI: 1.4 hrs/yr MAIFI: 2.7 mom/yr 3.3 miles R Substation 2 R N.O. Recloser Assumptions Circuit breakers have reclosing capability Reclosers require 1 minute to switch R N.C. Recloser N.C. Recloser N.C. - Normally-Closed N.O. - Normally-Open R R N.C. Recloser N.C. Recloser 3.3 miles Case 5 - With Single-Pole Reclosing

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

© ABB PTMV - 11 ABB Summary of Reclosing Benefits with Single Phase R R R R R R R R R R R R R Case 1 - Substation reclosing 3 phase only Case 3 - Loop with Manual Switch Case 2 - Line Recloser Case Recloser Automatic Loop Restoration Case Recloser Automatic Loop Restoration % % % % % % % % Hrs/Yr %* *% Improvement as compared to Case 1 Single phase

© ABB PTMV - 12 ABB Predictive Reliability Analysis 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 perspective and determining the most cost-effective solutions ABB Consulting’s Performance Advantage TM Software