CESI Round Table on “Asset Management” Asset Management Tools A System Approach to Condition Based Maintenance of Power Networks 2003 CIRED Conference

CESI 1  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

CESI 2  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.

CESI 3  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 2003 CIRED Conference Introduction/cont.

CESI 4 Power quality standards stated by Regulators Return on investments The new strategies have to be identified with the aim to achieve the due balance between: Introduction/cont CIRED Conference

CESI 5  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 expenditures  improving performances just to respect the service quality standards stated by the Regulators  preserving the value of assets 2003 CIRED Conference Introduction/cont.

CESI 6 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 7  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 CIRED Conference Introduction/cont.

CESI 8 The integration is required of several aspects Access to background / foreground plant data On-line monitoring of plant status Support decisions on maintenance actions High number of plants and equipment Plants scattered in a wide territory Introduction/cont CIRED Conference

CESI 9  Objectives Synthesis 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

CESI 10  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 2003 CIRED Conference E-maintenance for power electric network

CESI 11  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 CIRED Conference E-maintenance for power electric network

CESI 12  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 2003 CIRED Conference E-maintenance for power electric network

CESI 13  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 2003 CIRED Conference E-maintenance for power electric network

CESI 14 Trigger Modelli Background DB Foreground DB (tele-op. and monitoring ) Failure and intervention DB Inquiries Reports Business Intelligence Modelli Models Local user Central user Strategic output Operation results Network DB update Inquiries Reports Local user Power network E-maintenance for power electric network  Architecture/cont Corporate IT system 2003 CIRED Conference

CESI 15  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, 2003 CIRED Conference E-maintenance for power electric network

CESI Historical data Ratings Trigger Results of the model Inspections Tele-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 CIRED Conference

CESI 17  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 2003 CIRED Conference E-maintenance for power electric network

CESI 18  Knowledge base and engineering models/cont  Sources of the information used by the models: Historical files Ratings of components Past operation data Past maintenance actions 2003 CIRED Conference E-maintenance for power electric network

CESI 19  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 2003 CIRED Conference E-maintenance for power electric network

CESI 20  Knowledge base and engineering models/cont  The 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 2003 CIRED Conference E-maintenance for power electric network

CESI 21  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 2003 CIRED Conference E-maintenance for power electric network

CESI 22 E-maintenance for power electric network E- maintenance Internet/Intranet  IT structure and solutions  The web solution 2003 CIRED Conference

CESI 23 Modello Server Data Bases Corporate management systems Intranet Local station Central station Power network E-maintenance for power electric network  IT structure …….. The web solution/cont CIRED Conference

CESI 24  IT structure and solutions  Technological solution adopted Distributed 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 2003 CIRED Conference E-maintenance for power electric network

CESI 25  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 to  manage data relevant to a wide number of components  manage several types of data  retain historical data for many years 2003 CIRED Conference E-maintenance for power electric network

CESI 26  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 2003 CIRED Conference E-maintenance for power electric network

CESI 27  Application to transmission network  TERNA, the Company owner of the 95 % of the Italian transmission network developed, in collaboration with CESI, an e-maintenance system  The application regards a HV transmission network consisting of: 268 substations 3549 bays 550 transformers more than km of lines  The total number of the substation components are more than CIRED Conference E-maintenance for power electric networks

CESI 28 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 number Optimisation of the actions to revise and renew the network plants 2003 CIRED Conference

CESI 29  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? 2003 CIRED Conference E-maintenance for power electric network

CESI 30  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