Round Table on Asset Management Asset Management Tools
Round Table on “Asset Management” Asset Management Tools A System Approach to Condition Based Maintenance of Power Networks 2003 CIRED Conference CESI
Introduction · 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 CESI 1
Introduction/cont. · Revenues depends on power networks utilisation, regulated, in many countries, by National Regulators who state: Ø tariffs for the network use, based on detailed cost analysis Ø 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 CESI 2
Introduction/cont. · In the aforesaid scenario power network owners/managers have to identify new strategies to: Øcontrol the costs Øimprove the assets management Øincrease the asset profitability 2003 CIRED Conference CESI 3
Introduction/cont. The new strategies have to be identified with the aim to achieve the due balance between: Power quality standards stated by Regulators 2003 CIRED Conference Return on investments CESI 4
Introduction/cont. · 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: Øcontrolling expenditures Øimproving performances just to respect the service quality standards stated by the Regulators Øpreserving the value of assets 2003 CIRED Conference CESI 5
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 2003 CIRED Conference CESI 6
Introduction/cont. · The “Condition Based Maintenance” (CBM) approach allows: Ø the reduction of maintenance costs (by reducing/eliminating the need of periodic checks) Ø the optimisation of component life cycle Ø the optimisation of plant renewal. 2003 CIRED Conference CESI 7
Introduction/cont. The integration is required of several aspects Access to background / foreground plant data High number of plants and equipment 2003 CIRED Conference On-line monitoring of plant status Support decisions on maintenan ce actions Plants scattered in a wide territory CESI 8
E-maintenance for power electric network Objectives Synthesis of plant/component performances to support decision on maintenance/ replacement by the integration of data from : special monitoring systems IT corporate management system plant teleoperation 2003 CIRED Conference CESI 9
E-maintenance for power electric network · Distinctive features Ø Evaluation of performances of components and classes of components by manufacturer, type, age, operational environment Ø Development of knowledge base (engineering models) based on the present status, the past operation experience, the physical features of the components 2003 CIRED Conference CESI 10
E-maintenance for power electric network · Distinctive features/cont. Ø Identification of the best maintenance actions aimed to achieve the Company objectives Ø Analysis of historical data to identify correlation and improve the technical staff know how Ø Integration in the Corporate management procedures and in the tele-operation and monitoring systems plants/components. 2003 CIRED Conference CESI 11
E-maintenance for power electric network · Architecture Ø An e-maintenance system integrates information and data owned by different legacy Ø Maintenance on condition requires much more informed DSS Ø 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 2003 CIRED Conference CESI 12
E-maintenance for power electric network · Architecture/cont. Ø Data-base with background and foreground data of plants and components Ø Expert system to implement the knowledge base in the identification of the maintenance/replacement actions Ø Statistical and correlation analysis 2003 CIRED Conference CESI 13
E-maintenance for power electric network ·Architecture/cont Strategi c output Central user • Inquiries • Reports • Business Intelligence Failure and interventi on DB • Operation results • Network DB update • Inquiries Local • Reports Corporate IT system Backgrou nd DB Modelli Local user Models Foreground DB (tele-op. and monitoring) Power networ k Trigger user 2003 CIRED Conference CESI 14
E-maintenance for power electric network · Knowledge base and engineering models Ø A set of models, one for each component type, defines the rules and criteria of maintenance on condition Ø The models are activated: ü automatically, when a new significant data/information relevant to a component is available or at a fixed time, ü by interactive action of the maintenance staff following an inspection, 2003 CIRED Conference CESI 15
E-maintenance for power electric network • Knowledge base and engineering models/cont. - Telecontrol & monitoring Trigger Inspectio ns Measurements and anomalies ev. - Historical Ratings Diagnostic Engineering Model Power networ k data Historic al files Results of the model 2003 CIRED Conference CESI 16
E-maintenance for power electric network · Knowledge base and engineering models/cont Ø Sources of the information used by the models: Inspection on components üInformation are usually provided by visual checks and by reading the instrumentation during the normal operation of components. üMore detailed information are provided by technical checks and measurements when the component is out of service 2003 CIRED Conference CESI 17
E-maintenance for power electric network · Knowledge base and engineering models/cont Ø Sources of the information used by the models: Historical files üRatings of components üPast operation data üPast maintenance actions 2003 CIRED Conference CESI 18
E-maintenance for power electric network · Knowledge base and engineering models/cont Ø Sources of the information used by the models: Tele-control and monitoring systems üReadings of appropriate sensors integrated in the tele-control and monitoring systems of components üThe readings, locally stored, are acquired and elaborated by models at fixed times üThis data source may substitute physical inspections CESI 2003 CIRED Conference 19
E-maintenance for power electric network · Knowledge base and engineering models/cont Ø The application of the engineering models provide: ü detection of anomalies, directly identified by the local staff (after inspection) or on the basis of the available measurements ü identification of the maintenance actions to be undertaken and the relevant priorities, ü description of the main steps used by the diagnostic algorithm, just to allow the improvement of the understanding of the decision making process CESI 2003 CIRED Conference 20
E-maintenance for power electric network · IT structure and solutions ØObjectives and constraints ü Integration (i. e. , no redundancy, synchronisation) with corporate management systems and with the technical operation systems ü Communication between plants, local files, central databases, local and central user stations ü Adoption of state-of-the art IT solutions 2003 CIRED Conference CESI 21
E-maintenance for power electric network ·IT structure and solutions ØThe web solution Internet/Intranet E-maintenance 2003 CIRED Conference CESI 22
E-maintenance for power electric network ·IT structure ……. . üThe web solution/cont. Corporate management systems Power network Data Bases Modell o Intranet Server Central station Intranet Local station 2003 CIRED Conference Local station CESI 23
E-maintenance for power electric network · IT structure and solutions ØTechnological solution adopted ü Distributed architecture based on INTERNET technology. The solution allows the connection of hundreds or thousands of personnel of the local technical staff ü Data base structured to facilitate communication with the other IT Corporate systems 2003 CIRED Conference CESI 24
E-maintenance for power electric network · IT structure and solutions ØTechnological solution adopted/cont. ü Data warehouse to integrate historical data provided by different sources/operators. The solution is recommended by the need to manage data relevant to a wide number of components manage several types of data retain historical data for many years 2003 CIRED Conference CESI 25
E-maintenance for power electric network · IT structure and solutions ØTechnological solution adopted/cont. ü 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 ü Data mining techniques to analyse historical data and identify the existing relations ü Friendly MMI Distributed architecture based on INTERNET technology 2003 CIRED Conference CESI 26
E-maintenance for power electric networks · Application to transmission network ØTERNA, the Company owner of the 95 % of the Italian transmission network developed, in collaboration with CESI, an e-maintenance system ØThe application regards a HV transmission network consisting of: ü 268 substations ü 3549 bays ü 550 transformers ü more than 30. 000 km of lines ØThe total number of the substation components are more than 40. 000 2003 CIRED Conference CESI 27
E-maintenance for power electric network Ø Application to transmission network. The benefits ü Standardisation and complete automation of the maintenance /substitution process ü Creation of a well assessed knowledge base and data bases that will improve the Corporate maintenance policies ü Reduction of the number of the maintenance actions. Elimination of periodic maintenance actions ü Reduction/elimination of the failures number ü Optimisation of the actions to revise and renew the network plants 2003 CIRED Conference CESI 28
E-maintenance for power electric network · Subjects for further discussion ü 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? 2003 CIRED Conference CESI 29
E-maintenance for power electric network · Subjects for further discussion/cont. üIn 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 CESI 30
- Slides: 31