Interruption Costs for Different PowerPoint Presentation, PPT - DocSlides

Interruption CostsforDifferent Lateral Protection Strategies

X.CHEN, C.J.COOK, P.J.FAHEYS&C Electric CompanyCIGRE – 2015 Grid of the Future SymposiumChicago ILOctober 12, 2015

1

Outline

2

Quick overview of lateral

p

rotection

s

trategies

Detailed discussion of calculating interruption

c

osts

Some background info

Calculation method

Results

Conclusion

Overview of lateral protection strategies

3

Fuse Blowing lateral protection strategy

One shot to take out the fault

Coordinated to localize the impact

Results

in unnecessary sustained

interruption

Truck roll every time a fuse blows

Fuse Saving lateral protection strategy

Upper-stream breaker recloses

on

the first fault-clearing attempt

Downstream fuse saved

Results

a momentary service discontinuity on the entire feeder

Sometimes doesn’t work…

Lateral Reclosing protection strategy

Reclose at tap point of a lateral

Reduces

momentaries

as it localizes the impact

Eliminates

sustained interruptions

Calculating Interruption Costs – Background InfoWhy is calculating interruption cost and reliability important?Provide a system level understanding of the O&M

costsTruck roll costs due to sustained outagesReliability IndicesImposition of outage penaltiesUnderstand more about electricity users costsCosts due to both sustained outage and momentaries

Why

did

S&C we

work on finding a systematic way to calculate the interruption costs?

Utilities do not have a good tool to use today

To help utilities make decisions on what is the best lateral protection strategies that works for them

4

5Calculation Method – Annual Utility Costs

Calculation Method – Annual Utility CostsFuse Blowing

6

Calculation Method – Annual Utility CostsFuse Saving

7

Calculation Method – Annual Utility CostsLateral Reclosing

8

9Calculation Method – Annual Electricity User Costs

Calculation Method – Annual Electricity User CostsFuse Blowing

10

Calculation Method – Annual Electricity User CostsFuse Blowing

11

Calculation Method – Annual Electricity User CostsFuse Blowing

12

Calculation Method – Annual Electricity User CostsFuse Saving

13

Calculation

Method – Annual Electricity User Costs

Fuse Saving

14

#

Calculation

Method – Annual Electricity User Costs

Fuse Saving

15

#

Calculation Method – Annual Electricity User CostsFuse Saving

16

Calculation Method – Annual Electricity User CostsLateral Reclosing

17

Calculating Interruption Costs – AssumptionsTypical Inputs to the Interruption Costs Calculation

18

Topology

Feeder

Laterals

Other

Length, Miles

Faults Per Mile Per Year

Number of Laterals

Average Length, Miles

Faults Per Mile Per Year

Transient Faults %

Fuse-Saving Success Factor

Truck Roll Cost

Installed Cost of Lateral Recloser

Urban

3

0.3

30

0.5

1.0

80%

25%$500

$2,500Suburban50.3251.01.080%

25%$500

$2,500Exurban100.4202.51.080%50%$750$2,500

Rural

200.5205.01.080%50%$1000$2,500

Calculating Interruption Costs – AssumptionsDistribution of Electricity Users Per Feeder

19

Sector

Location

Number of Users Per Feeder

Ave Cost*

Per Sustained Interruption

Ave Cost*

Per Momentary

Interruption

Medium & Large

C&I (A)

Feeder

13

$6,547

$3,332

Small

C&I (B)

Feeder

83

$1,021

475Lateral4$1,021475Residential (C)Lateral900$6

$4* Costs obtained from ICE – Interruption Cost Estimate Calculator

20User Inputs

User Inputs

Number of Laterals

Average Lateral Length (mile or km)

Lateral Faults per mile or km per Year

Feeder Length (mile or km)

Feeder Faults per mile or km per Year

$ Cost

of Truck Roll

% Transient Faults

% Fuse

Save Success

Factor

$ Installed

Cost of

Lateral

Reclosing Device

Sector

Location

Number

Medium & Large C&I

Feeder

Small C&I

FeederLateralResidentialLateral

21Results

22Results – Utility Interruption Costs

Fuse-Blowing vs Lateral ReclosingFuse-Saving vs Lateral Reclosing

Topology

Utility Interruption Costs

Lateral Reclosing Savings

Payback, Years

IRR

Fuse Blowing

Lateral Reclosing

Urban

$7,509

$1,509

$6,000

12.5

-4%

Suburban

$12,650

$2,650

$10,000

6.3

10%

Exurban$38,100

$8,100$30,000

1.759%Rural$102,000$22,000$80,0000.6160%

Topology

Utility Interruption CostsLateral Reclosing SavingsPayback, YearsIRRFuse SavingLateral ReclosingUrban$6,090$1,590$4,500

16.7

-8%Suburban$10,150$2,650$7,5008.33%Exurban$23,100$8,100$15,0003.327%

Rural

$62,000$22,000$40,0001.380%

23Results – Electricity User Interruption Costs

Fuse-Blowing vs Lateral ReclosingFuse-Saving vs Lateral Reclosing

Topology

Electricity User Interruption Costs

Lateral Reclosing Savings

Fuse Blowing

Lateral Reclosing

Urban

$100,236

$98,607

$1,629

Suburban

$168,610

$165,352

$3,258

Exurban

$448,077

$439,931

$8,146

Rural

$1,108,564

$1,092,273$16,291

Topology

Electricity User Interruption CostsLateral Reclosing SavingsFuse SavingLateral ReclosingUrban$1,107,934$98,607$1,009,328

Suburban

$1,847,798$165,352$1,682,446Exurban$3,853,170$439,931$3,413,239Rural$7,918,750$1,092,273$6,826,478

24Results – Reliability Indices

Fuse-Blowing vs Lateral ReclosingFuse-Saving vs Lateral Reclosing

Topology

SAIFI

MAIFI

E

Fuse Blowing

Lateral Reclosing

%

Reduction

Fuse Blowing

Lateral Reclosing

%

Increase

Urban

0.6

0.3

50%

0.7

1.1

57%

Suburban1.20.558%1.2

1.958%

Exurban3.11.358%3.25.056%Rural

6.52.9

55%8.011.645%TopologySAIFIMAIFIEFuse Saving

Lateral Reclosing%Reduction

Fuse SavingLateral Reclosing%ReductionUrban0.50.340%4.61.176%Suburban1.0

0.550%

7.61.975%Exurban2.21.341%25.15.080%Rural4.72.938%51.811.6

78%

25Conclusion

Lateral Reclosing Protection Strategy offers the best overall resultsLowest annual interruption costs for both utility and electricity usersLowest SAIFIFuse BlowingHighest annual utility interruption costsFuse Saving

Extremely high annual electricity user interruption

costs

26End