© ABB GroupSeptember 4, 2015 | Slide 1

Substation Asset HealthPrioritizing investments in substationretrofit

Rogério Piva, Agosto de 2015 – Evento Automation & Power World Brasil

© ABB

Optimal Solutions for Aging SubstationsContent

Methodology for selecting optimal solutions for agingsubstations§ Substation Risk Analysis

§ Substation condition assessment§ Reliability model and analysis§ Reliability Centered Maintenance – RCM

§ Definition of Potential Alternative Solutions§ Identify technical solutions§ Selecting design comparison criteria

§ Alternative Solutions - Reliability & Economics Analysis§ Reliability models§ Reliability analysis§ LifeStretch™ results analysis

§ Conclusions§ Selecting an optimal solution

© ABB04 September 2015 | Slide 3

Introduction to Substation LifeStretchTM

Asset management challenge

Our goal is to enable you to select your optimal solution for each case.

Challenge lies on assessing all relevant factors to consider for the decisionmaking

Both when the substation lifecycle is reaching the design limit and when there is aneed to extend the functionality of the asset, multiple technical solutions can be

considered.

© ABB04 September 2015 | Slide 4

Introduction to Substation LifeStretchTM

Asset management challengeSS Lifetime management is a balance act where different factors needs to be consideredSS Lifetime management is a balance act where different factors needs to be considered

o New expected lifetime

o Health and Safetyaspects

o Functional specification

o Remote monitoringfeatures

o …

o Substation risk profile

o Expected mean time between failures

o Expected mean time to repair

o Unplanned outages duration

o Unplanned outages frequency

o Substation availability in the different pointsof connection.

o Initial investment

o Substation Lifecyclecost

o Cost of powerinterruption

o Operation andMaintenance cost

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Substation AssessmentDeferred maintenance is a global phenomenon

§ Life goes on, but expected lifetime is not likely to be reached...

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Substation AssessmentDetermining which substation to prioritize

If focus is on condition – of course the substation from 1980 will be prioritizedBut, condition-based assessment alone does not provide a completely accurate picture

The substation’s importance in the network, or the consequences of a failure, must beidentified as wellABB’s assessment model is based on reliability centered maintenance (RCM) principles.

1980 2001

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Substation AssessmentEach component condition is assessed individually

§ The assessment is performed in closecooperation with the substation owner

No power interruption is required forthis assessment

§ Basic component data is confirmed§ Identification number§ Manufacturer, type, serial number etc.§ Year of manufacture

§ Tailored assessment criteria for differentcomponent types

§ Assessment criteria elaborated to ensuremulti-angle analysis:§ Component-specific point of view§ Component as part of the system§ User-specific operational feedback§ ABB’s global experience

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Substation AssessmentAll components plotted in a risk matrix

Condition is assessed and is based on:Personal safety§ Application & design§ Environment§ Number of operations and short circuits§ Operational experience§ Maintenance program§ Availability of spare parts and expertise§ Others

Importance is calculated based onInjuries of personnel§ Environmental impact§ Criticality of loads§ Economical factors for the user e.g. loss of

production and consequential damages.§ Others

Green – NormalSituation undercontrol

Yellow – Watch outActions requiredwithin certain time

Red – UrgentActions required

urgently

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Maintenance Considerations Sequence of actions

Condition basedMaintenance

(CBM)Considers

condition only

Conditions c1-c6 determinethe sequence of actions:

§ Replacement of 1§ Replacement of 4§ Replacement of 2§ Maintenance on 3§ Maintenance on 6§ Inspection on 5

ReliabilityCentered

Maintenance(RCM)

Considers the riski.e. both Conditionand Importance.

Risks r1-r6 determine thesequence of actions:

§ Replacement of 6§ Maintenance of 4§ Maintenance on 5§ Maintenance on 2§ Inspection on 3§ Inspection on 1 (or fault

correction due to very lowImportance)

Substation AssessmentPrioritized actions based on RCM

(Con

ditio

n)

Good

Poor

1

2

4

3 6

5

c1 c2 c3 c4 c5 c6

Red=Replacement

Yellow=Maintenance

Green=Inspection

(Importance)Low High

1

2

4

3 6

5

(Con

ditio

n)

Good

Poor

r4

r1

r2

r3

r6

r5

© ABB

Substation AssessmentFacilitates alternative investment decisions

§Recommen-dations

SubstationComponentsAssessment

Recommen-dations

AdditionalComponentDiagnostics

LifeStretch™Assessment

Repair and/orReplacement

Maintenance

§ A structured process to define investment alternatives on the basis ofReliability Centered Maintenance philosophy

© ABB

Substation AssessmentSummary

Service offerings derived from same commonrisk analysis platform:§ Condition assessment of all components involved is

performed on site – no outage is required

§ Importance calculation for all components throughopen source reliability statistics1) – consequentialsystem impact from a failure is defined

1) From Cigré, IEEE, CEA, local data

Situation & recommendationsReport

Site Inspection(Condition Assessment) Scope and strategy Proposal

Comparison of alternatives

Risk analysis

Substation Assessment

Report

Maintenance Contract

Substation Reliability and Economic Evaluation

© ABB

Substation LifeStretch™ AnalysisReliability and Economic Optimization

Alternatives technical benchmarking

Comparison criteria based on differentobjectives:

• Load feeders outage frequency &duration

• Due to equipment malfunction• Due to scheduled maintenance

• Substation alternative life cycle cost• Initial investment• O&M cost• Interruption cost

• …

Guided process

Perform reliability and economic analysis toidentify an optimal investment solution toimprove substation reliability

© ABB

Substation LifeStretch™ AnalysisReliability Assessment & Analysis - RCM§ Calculating reliability at any point of the

substation

§ Ranking components contribution toreliability – used also to evaluate theImportance in the Assessment phase

§ for the entire substation

§ for specific load feeder

§ Using different criteria for componentsranking:

§ Outage Frequency (OF)

§ Outage Duration (OD)

§ Expected Energy Not Supplied (EENS)

§ Economic Impact (ECOST)

AIS ring bus

GIS ring bus

© ABB

Substation LifeStretch™ AnalysisIdentifying potential alternatives

Model eachalternative by:

Perform calculations& analysis for each

substation alternative

Propose SubstationSolutions/Alternatives

considering:

O&M Cost

Investment Cost

Reliability resultsand analysis for theexisting substation

Specific customerrequirements and

preferences

Cost of powerinterruption

Total Life CycleCost for the project

Consider lifetime ofdifferent alternatives

Typically differentalternatives will

have different lifetime duration

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Substation LifeStretch™ AnalysisSelecting an optimal substation solution

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Substation LifeStretch™Best practice example

§ Identify the optimal investment solution based on thesubstation risk assessment and LifeStretch™ approach

§ Risk assessment of an aging 230kV substation based onanalysis of the components’ condition and their impacton substation reliability

§ Build reliability model for the existing substationswitchyard

§ Propose different options/alternatives to improvereliability and extend substation life

§ Select optimal investment solution based on reliabilityand life cycle cost analysis

§ The technical analysis performed in collaboration withABB allows the customer to identify the optimalinvestment solution

Purpose

TechnicalSolution

Description

Benefits

© ABB

Substation LifeStretch™ OptionsProposed alternatives

Option Replace or Upgrade Equipment

1 Replace existing circuit breakersand all disconnect switches

new state of the art dead tankcircuit breakers

1.1 Replace existing circuit breakersnew state of the art dead tankcircuit breakers and keepingthe old disconnect switches

2 Upgrade the operating mechanismsfor all circuit breakers

keep the rest of theswitchyard the same

3Upgrade the operating mechanismsand replacing the interrupters for allcircuit breakers

keep the rest of theswitchyard the same

4Upgrade the operating mechanismsand refurbish existing interruptersfor all circuit breakers

keep the rest of theswitchyard the same

Based on the assessment and reliability evaluation for theover 40 year old 230 kV substation, the following options wereproposed together with the customer:

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Substation LifeStretch™ AnalysisReliability results

OF – Outage FrequencyOD – Outage DurationMTBF – Mean Time Between Failure

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Substation LifeStretch™ AnalysisAlternatives colored by reliability

Original Configuration

Option 1 – New CBs & DS

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Substation LifeStretch™ OptionsAlternatives LCC comparison

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Substation LifeStretch™ Options - ConclusionsBest practice example

Option Replace or Upgrade Equipment Conclusion

1Replace existing circuitbreakers and alldisconnect switches

new state of the art deadtank circuit breakers

Second best solution based on the calculatedLCC§ the higher initial investments here are

compensated by the lower failure cost andservice disruption cost

1.1 Replace existing circuitbreakers

new state of the art deadtank circuit breakers andkeeping the old disconnectswitches

Best solution according to the calculated LCC§ this option cannot last for another 30 years,

i.e., with over 70 years life for the disconnectswitches

2Upgrade the operatingmechanisms for all circuitbreakers

keep the rest of theswitchyard the same

Third lowest LCC§ this option cannot last for another 30 years

with old interrupter and disconnect switches

3

Upgrade the operatingmechanisms and replacingthe interrupters for allcircuit breakers

keep the rest of theswitchyard the same

Worst performers based on the calculated LCCdue to the higher disruption and failure costs§ there is no assurance that the old circuit

breakers and disconnect switches will lastfor another 30 years after replacing theoperating mechanism and interrupter

4

Upgrade the operatingmechanisms and refurbishexisting interrupters for allcircuit breakers

keep the rest of theswitchyard the same

© ABB

Substation LifeStretchTM

Estimated execution schedule

1 - 3 weeksKick-off Workshop

Requirements analysis

Substation risk analysis

Substation Assessment

1 - 3 weeksFinal Workshop

Conclusions

Selecting the optimal solution

Action plan agreement

WorkshopObjective

ABB tasksprior to

workshop

Workshopdeliverables

Kick-Off workshop

§ Understanding project specific needs andcircumstances

§ Evaluate existing condition of the substation

§ Info collection for modelling the substation

§ LifeStretch team members definition§ Project requirements agreements§ Site condition assessment

Technical workshop

§ Agree the bases of the reliability staudy tobe performed

§ Substation Risk profile calculation§ High level design of potential alternatives to

discuss during workshop

§ Agreement on the technical alternatives tostudy

§ Agreement on the comparison criteria to beused to identify the optimal solution

Final workshop

§ Achieve a clear understanding of the prosand cons of the solutions analyzed

§ Provide Draft LifeStretch report to discussduring workshop.

§ Comprehensive presentation of LifeStretchresults.

§ Agreed LifeStretch report including clearrecommendation based on the data of thestudy to facilitate the decision makingprocess

© ABB04 September 2015 | Slide 23

Substation LifeStretchTM

Conclusions

ABB is your partner to make the right investment choice.

Tailored analysis of actual status and technical alternatives in order to helpyou to identify your optimal solution.

Substation LifeStretch Methodology is based on a collaboration process to enableyou to identify the optimal solution to extend your asset lifecycle or functionality.

© ABB

Informações

Caso nescessite de informações adicionais, favor contactar:

CONTATO Rogério Piva

FONE 11 9 8354 6376

E-MAIL rogerio.piva@br.abb.com

OBRIGADO PELA PRESENÇA !!!!