overhead distribution systems
DESCRIPTION
Overhead Distribution Systems. 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 - PowerPoint PPT PresentationTRANSCRIPT
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Overhead Distribution Systems
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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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Improving Distribution Reliability with Reclosers
Basic Radial System
Substation SAIFI: 4.3 int/cust/yrSAIDI: 8.8 hrs/yrMAIFI: 0.0 mom/yr
10 miles
Case 1
Circuit Breaker withNo Reclosing Capability
Substation SAIFI: 1.6 int/cust/yrSAIDI: 3.3 hrs/yrMAIFI: 8.7 mom/yr
10 miles
Case 2
Recloser
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Use of Line Reclosers
Substation SAIFI: 2.6 int/cust/yrSAIDI: 5.4 hrs/yrMAIFI: 2.1 mom/yr
5 miles
Case 3
Circuit Breaker withNo Reclosing Capability
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5 miles
Substation SAIFI: 1.2 int/cust/yrSAIDI: 2.6 hrs/yrMAIFI: 6.5 mom/yr
5 miles
Case 4
Recloser
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5 miles
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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 5
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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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Automatic Loop Restoration - 3 Reclosers
Substation 1
SAIFI: 1.0 int/cust/yrSAIDI: 2.1 hrs/yrMAIFI: 6.8 mom/yr
5 miles
Case 6
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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 - 5 Reclosers
Substation 1
SAIFI: 0.8 int/cust/yrSAIDI: 1.7 hrs/yrMAIFI: 6.5 mom/yr
3.3 miles
Case 7
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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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Summary of Reclosing Benefits
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Case 1 - No reclosing
Case 2 - Substation reclosing
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Case 5 - Loop with Manual Switch
Case 4 - Line Recloser
Case 7 - 5-Recloser Automatic Loop Restoration
Case 6 - 3-Recloser Automatic Loop Restoration
3.3 63%
8.8 ----
2.6 70%
2.3 74%
2.1 76%
1.7 81%
Hrs/Yr %*
*% Improvement as compared to Case 1
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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
***With Single-Pole Reclosing***
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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
***With Single-Pole Reclosing***
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Benefits of Single-Pole Reclosing
SAIFI SAIDI MAIFI
3-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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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
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Improving Distribution Reliability
ABB is the ONLY supplier that can do this in all of the above schemes!