Introduction
Addressed issues:
• Network reliability – Security of supply
• Application to maintenance and renewing
• Regulation of quality of supply
Participants:
Round Table 3
•
G. Brauner (AT)
•
(Dr. Vasconcelos) R.Malaman (IT)
•
G. Kjølle (NOR)
•
W. Wellßow (GE)
•
(Dr. Riechmann) Phil Burns (GB)
Fault Statistics in Distribution Networks
Background
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.
Round Table 3
Fault Statistics in Distribution Networks
Network reliability
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?
Round Table 3
Fault Statistics in Distribution Networks
Application to maintenance and renewing
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?
Round Table 3
Fault Statistics in Distribution Networks
Regulation of quality of supply
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?
Round Table 3
Fault Statistics in Distribution Networks
Fault statistics
Definition
Reliability
indices
Fault statistic
Data collection
Round Table 3
Reliability
calculation
Network
development
Maintenance
decision
Quality
indices
Regulator
Fault Statistics in Distribution Networks
Participants
Manufactures
Utilities
Research
Fault statistic
Customers
Industry
Regulator
Round Table 3
Politicians
Fault Statistics in Distribution Networks
Structure of Round Table
• Presentation and introduction of subjects
• Examples from different countries
• Questions and discussion
• Summary and expectations for the future
Round Table 3
Fault Statistics in Distribution Networks
Sequence of presentations
• 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
Round Table 3
Fault Statistics in Distribution Networks
Questions
• 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?
Round Table 3
Fault Statistics in Distribution Networks
Further questions
• 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
Round Table 3
Fault Statistics in Distribution Networks
Conclusion
• 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 !
Round Table 3
Fault Statistics in Distribution Networks
Fault statistics
Definition
Regulator
Data collection
Round Table 3
Reliability
indices
Fault statistic
Reliability
calculation
Network
development
Maintenance
decision
Quality
indices
Regulator
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
Round Table 3
Fault Statistics in Distribution Networks