1. Round Table 3Fault Statistics in Distribution Networks Addressed issues: Network reliability – Security of supply Application to maintenance and renewing Regulation of quality of supply Participants: G. Brauner (AT) (Dr. Vasconcelos) R.Malaman (IT) G. Kjølle (NOR) W. Wellßow (GE) (Dr. Riechmann) Phil Burns (GB) Introduction

2. Round Table 3Fault 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

3. Round Table 3Fault 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

4. Round Table 3Fault 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

5. Round Table 3Fault 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

6. Fault statistic Maintenance decision Reliability indices Quality indices Reliability calculation Network development Data collection Definition Regulator Round Table 3Fault Statistics in Distribution Networks Fault statistics

7. Round Table 3Fault Statistics in Distribution Networks Utilities Fault statistic Industry Customers Manufactures Research Regulator Politicians Participants

8. Round Table 3Fault 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

9. Round Table 3Fault Statistics in Distribution Networks W. WellßowStructure of fault statistic R. MalamanFault statistics for regulators G. KjølleRegulation of quality of supply P. BurnsApplication of service data G. BraunerFault statistics – Quo vadis Sequence of presentations

10. Round Table 3Fault 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

11. Round Table 3Fault 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

12. Round Table 3Fault Statistics in Distribution Networks Fault statistics are a valuable tool for quality management for utility and customer Results of fault statistics can also be used for 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

13. Fault statistic Maintenance decision Reliability indices Quality indices Reliability calculation Network development Data collection Definition Regulator Round Table 3Fault Statistics in Distribution Networks Fault statistics Regulator

14. Round Table 3Fault 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