swot analysis bu 3440
TRANSCRIPT
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Overhead Distribution Systems
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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)
DistributionSubstation 10 miles
115 kV 13.8 kV3 miles
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Basic Radial System
Substation 10 miles
Case 1
SAIFI: 1.6 int/cust/yrSAIDI: 3.3 hrs/yrMAIFI: 8.7 mom/yr
Recloser
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Case 2Substation 5 miles
Recloser
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5 miles
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SAIFI: 1.2 int/cust/yrSAIDI: 2.6 hrs/yrMAIFI: 6.5 mom/yr
Case 2 - with Single-Pole Reclosing
Substation 5 miles
Recloser
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5 miles
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SAIFI: 1.1 int/cust/yrSAIDI: 2.3 hrs/yrMAIFI: 5.4 mom/yr
Single phase
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Loop Configuration with Manual Switch
Substation 1
SAIFI: 1.2 int/cust/yrSAIDI: 2.3 hrs/yrMAIFI: 6.5 mom/yr
5 miles
Case 3
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5 miles
Substation 2
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ManualTie
Switch
Assumptions•Circuit breakers have reclosing capability•Manual Tie Switch requires 1 hour to switch•Reclosers require 1 minute to switch
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Loop Configuration with Manual Switch
Substation 1
SAIFI: 1.1 int/cust/yrSAIDI: 2.0 hrs/yrMAIFI: 5.4 mom/yr
5 miles
Case 3 - With Single-Pole Reclosing
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5 miles
Substation 2
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ManualTie
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
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Automatic Loop Restoration - 3 Reclosers
Substation 1
SAIFI: 1.0 int/cust/yrSAIDI: 2.1 hrs/yrMAIFI: 6.8 mom/yr
5 miles
Case 4
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5 miles
Substation 2
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N.O.Recloser
Assumptions•Circuit breakers have reclosing capability•Reclosers require 1 minute to switch
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N.C.Recloser
N.C.Recloser
N.C. - Normally-ClosedN.O. - Normally-Open
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Automatic Loop Restoration - 3 Reclosers
Substation 1
SAIFI: 0.8 int/cust/yrSAIDI: 1.8 hrs/yrMAIFI: 3.1 mom/yr
5 miles
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5 miles
Substation 2
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N.O.Recloser
Assumptions•Circuit breakers have reclosing capability•Reclosers require 1 minute to switch
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N.C.Recloser
N.C.Recloser
N.C. - Normally-ClosedN.O. - Normally-Open
Case 4 - With Single-Pole Reclosing
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Automatic Loop Restoration - 5 Reclosers
Substation 1
SAIFI: 0.8 int/cust/yrSAIDI: 1.7 hrs/yrMAIFI: 6.5 mom/yr
3.3 miles
Case 5
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3.3 miles
Substation 2
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N.O.Recloser
Assumptions•Circuit breakers have reclosing capability•Reclosers require 1 minute to switch
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N.C.Recloser
N.C.Recloser
N.C. - Normally-ClosedN.O. - Normally-Open
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N.C.Recloser
N.C.Recloser
3.3 miles
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Automatic Loop Restoration - 5 Reclosers
Substation 1
SAIFI: 0.6 int/cust/yrSAIDI: 1.4 hrs/yrMAIFI: 2.7 mom/yr
3.3 miles
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3.3 miles
Substation 2
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N.O.Recloser
Assumptions•Circuit breakers have reclosing capability•Reclosers require 1 minute to switch
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N.C.Recloser
N.C.Recloser
N.C. - Normally-ClosedN.O. - Normally-Open
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N.C.Recloser
N.C.Recloser
3.3 miles
Case 5 - With Single-Pole Reclosing
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Benefits of Single-Pole Reclosing
SAIFI SAIDI MAIFI3-Recloser Automatic Loop Restoration
3-PoleReclosing
1.0 2.1 6.8
Single-PoleReclosing
0.8 1.8 3.1
5-Recloser Automatic Loop Restoration
3-PoleReclosing
0.8 1.7 6.5
Single-PoleReclosing
0.6 1.4 2.7
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Summary of Reclosing Benefits with Single Phase
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Case 1 - Substation reclosing 3 phase only
Case 3 - Loop with Manual Switch
Case 2 - Line Recloser
Case 5 - 5-Recloser Automatic Loop Restoration
Case 4 - 3-Recloser Automatic Loop Restoration
3.3 --- 3.3 ---
2.6 21% 2.3 30%
2.3 30% 2.0 39%
2.1 36% 1.8 45%
1.7 48% 1.4 58%
Hrs/Yr %* Hrs/Yr %*
*% Improvement as compared to Case 1
Single phase
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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 AdvantageTM Software