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CESI
Round Table on “Asset Management”
Asset Management Tools
A System Approach to Condition Based Maintenance of Power
Networks
2003 CIRED Conference
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CESI
Liberalised electricity markets are aimed to
competition and more performance based regulatory
schemes
Shareholders expectations are driving power industry managers to develop new strategies to increase revenues at lower costs
2003 CIRED Conference
Introduction
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Revenues depends on power networks utilisation, regulated, in many countries, by National Regulators who state:
tariffs for the network use, based on detailed cost analysis
standards for network performances, based on benchmarks with other electric systems aimed to identify internationally based best practices
In the case the stated standards are not met penalties are applied
2003 CIRED Conference
Introduction/cont.
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In the aforesaid scenario power network owners/managers have to identify new strategies to:
control the costs
improve the assets management
increase the asset profitability
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Introduction/cont.
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Power quality standards stated by
RegulatorsReturn on investments
The new strategies have to be identified with the aim to achieve the due balance between:
Introduction/cont.
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Profitability improvement of the “power networks” assets implies to optimise the process of plant maintenance and renewal
The maintenance/renewal process has a key role in:controlling expendituresimproving performances just to respect the
service quality standards stated by the Regulators
preserving the value of assets
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Introduction/cont.
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Introduction/cont.
In the last years the Condition Based Maintenance (CBM) approach has been introduced in the power network sector too.
CBM is aimed to operate maintenance actions on power network plants and components (or their renewal) in the case significant decay phenomena are detected and their functionality may be soon compromised
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The “Condition Based Maintenance” (CBM) approach allows:
the reduction of maintenance costs (by reducing/eliminating the need of periodic checks)
the optimisation of component life cycle the optimisation of plant renewal.
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Introduction/cont.
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The integration is required of several aspects
Access to background /
foreground plant data
On-line monitoring of plant status
Support decisions on maintenance
actionsHigh number of plants and
equipment
Plants scattered in
a wide territory
Introduction/cont.
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ObjectivesSynthesis of plant/component performances
to support decision on maintenance/ replacement by the integration of data from :
2003 CIRED Conference
E-maintenance for power electric network
special monitoring
systems
plant tele-operation
IT corporate management
system
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Distinctive features
Evaluation of performances of components and classes of components by manufacturer, type, age, operational environment
Development of knowledge base (engineering models) based on the present status, the past operation experience, the physical features of the components
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E-maintenance for power electric network
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Distinctive features/cont.
Identification of the best maintenance actions aimed to achieve the Company objectives
Analysis of historical data to identify correlation and improve the technical staff know how
Integration in the Corporate management procedures and in the tele-operation and monitoring systems plants/components.
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E-maintenance for power electric network
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Architecture
An e-maintenance system integrates information and data owned by different legacy
Maintenance on condition requires much more informed DSS
The information should not necessarily reside on the system itself; they can be stored into specific databases and gathered (by synchronous or asynchronous connections) when needed
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E-maintenance for power electric network
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Architecture/cont.
Data-base with background and foreground data of plants and components
Expert system to implement the knowledge base in the identification of the maintenance/replacement actions
Statistical and correlation analysis
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E-maintenance for power electric network
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TriggerTrigger
TriggerModelli
Background DB
Foreground DB
(tele-op. and monitoring)
Failure and intervention
DB
•Inquiries•Reports•Business Intelligence
ModelliModels
Local user
Central user
Strategicoutput
•Operation results•Network DB update•Inquiries•Reports
Local user
Power network
E-maintenance for power electric network Architecture/cont
Corporate IT system
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Knowledge base and engineering models
A set of models, one for each component type, defines the rules and criteria of maintenance on condition
The models are activated:automatically, when a new significant
data/information relevant to a component is available or at a fixed time,
by interactive action of the maintenance staff following an inspection,
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E-maintenance for power electric network
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-
--Historical dataRatings
Trigger
Results of the model
InspectionsTele-control &
monitoring
Historical files
Power network
Diagnostic
Measurements and anomalies ev.
Engineering Model
E-maintenance for power electric network•Knowledge base and engineering models/cont.
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Knowledge base and engineering models/cont
Sources of the information used by the models: Inspection on components
Information are usually provided by visual checks and by reading the instrumentation during the normal operation of components.
More detailed information are provided by technical checks and measurements when the component is out of service
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Knowledge base and engineering models/cont
Sources of the information used by the models: Historical files
Ratings of componentsPast operation dataPast maintenance actions
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Knowledge base and engineering models/cont
Sources of the information used by the models: Tele-control and monitoring systems
Readings of appropriate sensors integrated in the tele-control and monitoring systems of components
The readings,locally stored, are acquired and elaborated by models at fixed times
This data source may substitute physical inspections
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Knowledge base and engineering models/contThe application of the engineering models
provide:detection of anomalies,directly identified
by the local staff (after inspection) or on the basis of the available measurements
identification of the maintenance actions to be undertaken and the relevant priorities,
description of the main steps used by the diagnostic algorithm, just to allow the improvement of the understanding of the decision making process
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E-maintenance for power electric network
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IT structure and solutions
Objectives and constraints Integration (i.e., no redundancy,
synchronisation) with corporate management systems and with the technical operation systems
Communication between plants, local files, central databases, local and central user stations
Adoption of state-of-the art IT solutions
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E-maintenance for power electric network
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E-maintenance for power electric network
E-maintenance
Internet/Intranet
IT structure and solutionsThe web solution
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Modello
Server
Data Bases
Corporate management systems
Intranet
Intr
anet
Local station
Local station
Central station
Power network
E-maintenance for power electric networkIT structure ……..
The web solution/cont.
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IT structure and solutions
Technological solution adoptedDistributed architecture based on INTERNET
technology. The solution allows the connection of hundreds or thousands of personnel of the local technical staff
Data base structured to facilitate communication with the other IT Corporate systems
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IT structure and solutions
Technological solution adopted/cont.Data warehouse to integrate historical data
provided by different sources/operators. The solution is recommended by the need tomanage data relevant to a wide number of componentsmanage several types of dataretain historical data for many years
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IT structure and solutions
Technological solution adopted/cont.Expert Systems (ES) to build-up the
logical/deductive models used to build up the engineering models. ES allows to assess and consolidate the knowledge base of the maintenance process
Data mining techniques to analyse historical data and identify the existing relations
Friendly MMI Distributed architecture based on INTERNET technology
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E-maintenance for power electric network
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Application to transmission networkTERNA, the Company owner of the 95 % of the Italian transmission network developed, in collaboration with CESI, an e-maintenance systemThe application regards a HV transmission network consisting of:
268 substations 3549 bays 550 transformers more than 30.000 km of lines
The total number of the substation components are more than 40.000
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E-maintenance for power electric networks
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E-maintenance for power electric network
Application to transmission network. The benefits
Standardisation and complete automation of the maintenance /substitution process
Creation of a well assessed knowledge base and data bases that will improve the Corporate maintenance policies
Reduction of the number of the maintenance actions. Elimination of periodic maintenance actions
Reduction/elimination of the failures numberOptimisation of the actions to revise and renew the
network plants
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Subjects for further discussion
The key factor of the proposed approach is the evaluation of components condition. Significant improvements may be provided by additional monitoring systems. May the possible benefits be higher than the additional costs required?
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Subjects for further discussion/cont.
In the aforesaid example the proposed approach is applied to an HV transmission network. May the same approach be applied to MV and LV distribution networks?
2003 CIRED Conference
E-maintenance for power electric network
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