Round Table 3 Fault Statistics in Distribution Networks

Addressed issues:

•Network reliability – Security of supply

•Application to maintenance and renewing

•Regulation of quality of supplyParticipants:

•G. Brauner (AT)

•(Dr. Vasconcelos) R.Malaman (IT)

•G. Kjølle (NOR)

•W. Wellßow (GE)

•(Dr. Riechmann) Phil Burns (GB)

Introduction

Round Table 3 Fault Statistics in Distribution Networks

Faults in the distribution system have a direct and negative impact on the continuity of supply that is the first criterion to be considered for service evaluation and benchmarking.

All the network operators have been collecting fault statistics for a

long time. Up to now it was primarily for internal use but with the

liberalisation of the electricity sector, emphasis is put on

benchmarking and this gives a new impetus to the collection,

compilation, interpretation and utilization of fault statistics.

The round table discussions will bring feedback from different

countries on this matter.

Background

Round Table 3 Fault Statistics in Distribution Networks

Collection methods: different methods and classification systems are

used for the collection of fault statistics, in particular DMS systems can

be used for this purpose.

How far can it be automated?

How detailed should it be?

Faults statistics and data on the reliability of components can be used

for calculations of the future network performances.

How good is the prediction when compared with actual system

performances?

Network reliability

Round Table 3 Fault Statistics in Distribution Networks

Possible action to optimise the continuity of service is to drive the

maintenance and renewing strategies by basing them on component

reliabilities (induced from fault statistics) and their effect on system

performance.

Is this current practice?

How effective has it shown to be?

How detailed statistics are necessary for maintenance planning?

Application to maintenance and renewing

Round Table 3 Fault Statistics in Distribution Networks

In some countries the regulation authorities have introduced certain

requirements and penalty schemes concerning continuity of supply.

Documentation of faults and interruptions is a fundamental basis for

such regulation.

How far has the regulation come related to collection and reporting of

fault and interruption statistics?

Which standards are in use?

How precise is the definition of quality, fault and interruption?

Regulation of quality of supply

Fault statisticMaintenance

decision

Reliabilityindices

Qualityindices

Reliabilitycalculation

Networkdevelopment

Data collection

Definition

Regulator

Round Table 3 Fault Statistics in Distribution Networks

Fault statistics

Round Table 3 Fault Statistics in Distribution Networks

UtilitiesFault statistic

Industry

Customers

Manufactures Research

Regulator Politicians

Participants

Round Table 3 Fault Statistics in Distribution Networks

•Presentation and introduction of subjects

•Examples from different countries

•Questions and discussion

•Summary and expectations for the future

Structure of Round Table

Round Table 3 Fault Statistics in Distribution Networks

•W. Wellßow Structure of fault statistic

•R. Malaman Fault statistics for regulators

•G. Kjølle Regulation of quality of supply

•P. Burns Application of service data

•G. Brauner Fault statistics – Quo vadis

Sequence of presentations

Round Table 3 Fault Statistics in Distribution Networks

• Will there be a decrease of quality of supply as consequence of deregulation?

• Are new incentives necessary?

• Which are the different European approaches?

• Is it possible to take new indicators for power quality from fault statistics?

• Are these indicators also applicable for asset management?

Questions

Round Table 3 Fault Statistics in Distribution Networks

• What is the cost-benefit ratio for fault statistics

• What is the minimum size of network to draw statistical relevant data

• Is it possible to compare statistics from Norway with Italy

• Is it necessary to include manufacture and maintenance cycles into fault statistics

• Who is it possible to eliminate force majeur from fault statistics

Further questions

Round Table 3 Fault Statistics in Distribution Networks

• Fault statistics are a valuable toolfor quality management for utility and customer

• Results of fault statistics can also be usedfor asset management

• Efforts to fill fault statistics and benefits have to be balanced

• European harmonised statistic standard is required

• Regulator is top subject

• Discussion not finished !

Conclusion

Fault statisticMaintenance

decision

Reliabilityindices

Qualityindices

Reliabilitycalculation

Networkdevelopment

Data collection

Definition

Regulator

Round Table 3 Fault Statistics in Distribution Networks

Fault statistics

Regulator

Round Table 3 Fault Statistics in Distribution Networks

I like to thank:

• invited speakers

• all participants in the discussion

• interested people

and I wish you a successful further conference

sincerely

Theodor Connor