1. Overhead Distribution Systems
RULE NO. 1
All Tools and Templates have a support function in the strategic planning process. The following slides should definitely not drive us in our strategy planning but be of great help when consolidating.
Please note:
This is a set of recommended template which should support us in the strategic preparation phase. None of this templates are mandatory. It is up to BA PTMV to decide which templates support us in our analysis. So we will only use what makes sense for our type of business.
And last but not least: Have fun with the SWOT Analysis and contact me if you need my help.
Jasmin Staiblin

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

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

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

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

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

8. Summary of Reclosing Benefits
Hrs/Yr %*
Case 1 - No reclosing %
Case 2 - Substation reclosing R R
Case 4 - Line Recloser % R %
Case 5 - Loop with Manual
Switch R %
Case Recloser Automatic
Loop Restoration R %
Case Recloser Automatic
Loop Restoration
*% Improvement as compared to Case 1

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

10. Automatic Loop Restoration - 5 Reclosers
***With Single-Pole Reclosing***
Substation 1
3.3 miles
3.3 miles
3.3 miles R R
N.C.
Recloser
N.C.
Recloser
N.O.
Recloser R
Substation 2 R R
N.C.
Recloser
N.C.
Recloser
N.C. - Normally-Closed
N.O. - Normally-Open
SAIFI: int/cust/yr
SAIDI: hrs/yr
MAIFI: 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 perspective and 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!