cesi round table on “asset management” asset management tools a system approach to condition...

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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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


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


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


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


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.


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 :


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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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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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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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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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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-

--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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Sources of the information used by the models: Historical files

Ratings of componentsPast operation dataPast maintenance actions



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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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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

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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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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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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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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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


E-maintenance for power electric networks

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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?



cesi round table on “asset management” asset management tools a system approach to condition...

Documents

cired conference slide

cired conference emaintenance

maintenance of power

power network plants

process of plant maintenance

power network sector

maintenance replacement

network performances